diff options
Diffstat (limited to 'gdb/hppa-tdep.c')
| -rw-r--r-- | gdb/hppa-tdep.c | 1792 |
1 files changed, 1673 insertions, 119 deletions
diff --git a/gdb/hppa-tdep.c b/gdb/hppa-tdep.c index d0d5bf9..f784c21 100644 --- a/gdb/hppa-tdep.c +++ b/gdb/hppa-tdep.c @@ -23,6 +23,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "defs.h" #include "frame.h" +#include "bfd.h" #include "inferior.h" #include "value.h" @@ -33,9 +34,13 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <sys/types.h> #endif +#include <dl.h> #include <sys/param.h> #include <signal.h> +#include <sys/ptrace.h> +#include <machine/save_state.h> + #ifdef COFF_ENCAPSULATE #include "a.out.encap.h" #else @@ -52,6 +57,14 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "symfile.h" #include "objfiles.h" +/* To support asking "What CPU is this?" */ +#include <unistd.h> + +/* To support detection of the pseudo-initial frame + that threads have. */ +#define THREAD_INITIAL_FRAME_SYMBOL "__pthread_exit" +#define THREAD_INITIAL_FRAME_SYM_LEN sizeof(THREAD_INITIAL_FRAME_SYMBOL) + static int extract_5_load PARAMS ((unsigned int)); static unsigned extract_5R_store PARAMS ((unsigned int)); @@ -87,6 +100,9 @@ static int restore_pc_queue PARAMS ((struct frame_saved_regs *)); static int hppa_alignof PARAMS ((struct type *)); +/* To support multi-threading and stepping. */ +int hppa_prepare_to_proceed PARAMS (()); + static int prologue_inst_adjust_sp PARAMS ((unsigned long)); static int is_branch PARAMS ((unsigned long)); @@ -108,8 +124,29 @@ static void internalize_unwinds PARAMS ((struct objfile *, asection *, unsigned int, unsigned int, CORE_ADDR)); static void pa_print_registers PARAMS ((char *, int, int)); +static void pa_strcat_registers PARAMS ((char *, int, int, GDB_FILE *)); +static void pa_register_look_aside PARAMS ((char *, int, long *)); static void pa_print_fp_reg PARAMS ((int)); +static void pa_strcat_fp_reg PARAMS ((int, GDB_FILE *, enum precision_type)); + +typedef struct { + struct minimal_symbol * msym; + CORE_ADDR solib_handle; +} args_for_find_stub; + +static CORE_ADDR cover_find_stub_with_shl_get PARAMS ((args_for_find_stub *)); + +static int is_pa_2 = 0; /* False */ + +/* This is declared in symtab.c; set to 1 in hp-symtab-read.c */ +extern int hp_som_som_object_present; + +/* In breakpoint.c */ +extern int exception_catchpoints_are_fragile; +/* This is defined in valops.c. */ +extern value_ptr +find_function_in_inferior PARAMS((char *)); /* Should call_function allocate stack space for a struct return? */ int @@ -376,7 +413,7 @@ internalize_unwinds (objfile, table, section, entries, size, text_offset) for (i = 0; i < entries; i++) { table[i].region_start = bfd_get_32 (objfile->obfd, - (bfd_byte *)buf); + (bfd_byte *)buf); table[i].region_start += text_offset; buf += 4; table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *)buf); @@ -395,11 +432,14 @@ internalize_unwinds (objfile, table, section, entries, size, text_offset) table[i].Args_stored = (tmp >> 15) & 0x1; table[i].Variable_Frame = (tmp >> 14) & 0x1; table[i].Separate_Package_Body = (tmp >> 13) & 0x1; - table[i].Frame_Extension_Millicode = (tmp >> 12 ) & 0x1; + table[i].Frame_Extension_Millicode = (tmp >> 12) & 0x1; table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1; table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1; table[i].Ada_Region = (tmp >> 9) & 0x1; - table[i].reserved2 = (tmp >> 5) & 0xf; + table[i].cxx_info = (tmp >> 8) & 0x1; + table[i].cxx_try_catch = (tmp >> 7) & 0x1; + table[i].sched_entry_seq = (tmp >> 6) & 0x1; + table[i].reserved2 = (tmp >> 5) & 0x1; table[i].Save_SP = (tmp >> 4) & 0x1; table[i].Save_RP = (tmp >> 3) & 0x1; table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1; @@ -410,8 +450,13 @@ internalize_unwinds (objfile, table, section, entries, size, text_offset) table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1; table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1; table[i].Large_frame = (tmp >> 29) & 0x1; - table[i].reserved4 = (tmp >> 27) & 0x3; + table[i].Pseudo_SP_Set = (tmp >> 28) & 0x1; + table[i].reserved4 = (tmp >> 27) & 0x1; table[i].Total_frame_size = tmp & 0x7ffffff; + + /* Stub unwinds are handled elsewhere. */ + table[i].stub_unwind.stub_type = 0; + table[i].stub_unwind.padding = 0; } } } @@ -432,6 +477,7 @@ read_unwind_info (objfile) unsigned stub_entries, total_entries; CORE_ADDR text_offset; struct obj_unwind_info *ui; + obj_private_data_t *obj_private; text_offset = ANOFFSET (objfile->section_offsets, 0); ui = (struct obj_unwind_info *)obstack_alloc (&objfile->psymbol_obstack, @@ -461,8 +507,8 @@ read_unwind_info (objfile) if (elf_unwind_sec) { - elf_unwind_size = bfd_section_size (objfile->obfd, elf_unwind_sec); - elf_unwind_entries = elf_unwind_size / UNWIND_ENTRY_SIZE; + elf_unwind_size = bfd_section_size (objfile->obfd, elf_unwind_sec); /* purecov: deadcode */ + elf_unwind_entries = elf_unwind_size / UNWIND_ENTRY_SIZE; /* purecov: deadcode */ } else { @@ -486,8 +532,9 @@ read_unwind_info (objfile) total_size = total_entries * sizeof (struct unwind_table_entry); /* Allocate memory for the unwind table. */ - ui->table = obstack_alloc (&objfile->psymbol_obstack, total_size); - ui->last = total_entries - 1; + ui->table = (struct unwind_table_entry *) + obstack_alloc (&objfile->psymbol_obstack, total_size); + ui->last = total_entries - 1; /* Internalize the standard unwind entries. */ index = 0; @@ -520,8 +567,8 @@ read_unwind_info (objfile) (bfd_byte *) buf); ui->table[index].region_start += text_offset; buf += 4; - ui->table[index].stub_type = bfd_get_8 (objfile->obfd, - (bfd_byte *) buf); + ui->table[index].stub_unwind.stub_type = bfd_get_8 (objfile->obfd, + (bfd_byte *) buf); buf += 2; ui->table[index].region_end = ui->table[index].region_start + 4 * @@ -536,7 +583,18 @@ read_unwind_info (objfile) compare_unwind_entries); /* Keep a pointer to the unwind information. */ - objfile->obj_private = (PTR) ui; + if(objfile->obj_private == NULL) + { + obj_private = (obj_private_data_t *) + obstack_alloc(&objfile->psymbol_obstack, + sizeof(obj_private_data_t)); + obj_private->unwind_info = NULL; + obj_private->so_info = NULL; + + objfile->obj_private = (PTR) obj_private; + } + obj_private = (obj_private_data_t *)objfile->obj_private; + obj_private->unwind_info = ui; } /* Lookup the unwind (stack backtrace) info for the given PC. We search all @@ -551,16 +609,23 @@ find_unwind_entry(pc) int first, middle, last; struct objfile *objfile; + /* A function at address 0? Not in HP-UX! */ + if (pc == (CORE_ADDR) 0) + return NULL; + ALL_OBJFILES (objfile) { struct obj_unwind_info *ui; - - ui = OBJ_UNWIND_INFO (objfile); + ui = NULL; + if (objfile->obj_private) + ui = ((obj_private_data_t *)(objfile->obj_private))->unwind_info; if (!ui) { read_unwind_info (objfile); - ui = OBJ_UNWIND_INFO (objfile); + if (objfile->obj_private == NULL) + error ("Internal error reading unwind information."); /* purecov: deadcode */ + ui = ((obj_private_data_t *)(objfile->obj_private))->unwind_info; } /* First, check the cache */ @@ -657,8 +722,7 @@ pc_in_linker_stub (pc) ldsid (rp),r1 ; Get space associated with RP into r1 mtsp r1,sp ; Move it into space register 0 - be,n 0(sr0),rp) ; back to your regularly scheduled program - */ + be,n 0(sr0),rp) ; back to your regularly scheduled program */ /* Maximum known linker stub size is 4 instructions. Search forward from the given PC, then backward. */ @@ -729,6 +793,10 @@ find_proc_framesize (pc) struct unwind_table_entry *u; struct minimal_symbol *msym_us; + /* This may indicate a bug in our callers... */ + if (pc == (CORE_ADDR)0) + return -1; + u = find_unwind_entry (pc); if (!u) @@ -760,6 +828,10 @@ rp_saved (pc) { struct unwind_table_entry *u; + /* A function at, and thus a return PC from, address 0? Not in HP-UX! */ + if (pc == (CORE_ADDR) 0) + return 0; + u = find_unwind_entry (pc); if (!u) @@ -773,9 +845,9 @@ rp_saved (pc) if (u->Save_RP) return -20; - else if (u->stub_type != 0) + else if (u->stub_unwind.stub_type != 0) { - switch (u->stub_type) + switch (u->stub_unwind.stub_type) { case EXPORT: case IMPORT: @@ -801,7 +873,7 @@ frameless_function_invocation (frame) if (u == 0) return 0; - return (u->Total_frame_size == 0 && u->stub_type == 0); + return (u->Total_frame_size == 0 && u->stub_unwind.stub_type == 0); } CORE_ADDR @@ -818,7 +890,7 @@ saved_pc_after_call (frame) /* If PC is in a linker stub, then we need to dig the address the stub will return to out of the stack. */ u = find_unwind_entry (pc); - if (u && u->stub_type != 0) + if (u && u->stub_unwind.stub_type != 0) return FRAME_SAVED_PC (frame); else return pc; @@ -830,6 +902,9 @@ hppa_frame_saved_pc (frame) { CORE_ADDR pc = get_frame_pc (frame); struct unwind_table_entry *u; + CORE_ADDR old_pc; + int spun_around_loop = 0; + int rp_offset = 0; /* BSD, HPUX & OSF1 all lay out the hardware state in the same manner at the base of the frame in an interrupt handler. Registers within @@ -884,10 +959,12 @@ hppa_frame_saved_pc (frame) } else { - int rp_offset; + spun_around_loop = 0; + old_pc = pc; restart: rp_offset = rp_saved (pc); + /* Similar to code in frameless function case. If the next frame is a signal or interrupt handler, then dig the right information out of the saved register info. */ @@ -914,9 +991,15 @@ restart: pc = read_memory_integer (saved_regs.regs[RP_REGNUM], 4) & ~0x3; } else if (rp_offset == 0) - pc = read_register (RP_REGNUM) & ~0x3; + { + old_pc = pc; + pc = read_register (RP_REGNUM) & ~0x3; + } else - pc = read_memory_integer (frame->frame + rp_offset, 4) & ~0x3; + { + old_pc = pc; + pc = read_memory_integer (frame->frame + rp_offset, 4) & ~0x3; + } } /* If PC is inside a linker stub, then dig out the address the stub @@ -925,8 +1008,8 @@ restart: Don't do this for long branch stubs. Why? For some unknown reason _start is marked as a long branch stub in hpux10. */ u = find_unwind_entry (pc); - if (u && u->stub_type != 0 - && u->stub_type != LONG_BRANCH) + if (u && u->stub_unwind.stub_type != 0 + && u->stub_unwind.stub_type != LONG_BRANCH) { unsigned int insn; @@ -941,7 +1024,19 @@ restart: if ((insn & 0xfc00e000) == 0xe8000000) return (pc + extract_17 (insn) + 8) & ~0x3; else - goto restart; + { + if (old_pc == pc) + spun_around_loop++; + + if (spun_around_loop > 1) + { + /* We're just about to go around the loop again with + no more hope of success. Die. */ + error("Unable to find return pc for this frame"); + } + else + goto restart; + } } return pc; @@ -975,7 +1070,7 @@ init_extra_frame_info (fromleaf, frame) frame. (we always want frame->frame to point at the lowest address in the frame). */ if (framesize == -1) - frame->frame = read_register (FP_REGNUM); + frame->frame = TARGET_READ_FP (); else frame->frame -= framesize; return; @@ -996,7 +1091,7 @@ init_extra_frame_info (fromleaf, frame) sorts, and its base is the high address in its parent's frame. */ framesize = find_proc_framesize(frame->pc); if (framesize == -1) - frame->frame = read_register (FP_REGNUM); + frame->frame = TARGET_READ_FP (); else frame->frame = read_register (SP_REGNUM) - framesize; } @@ -1018,6 +1113,39 @@ frame_chain (frame) CORE_ADDR frame_base; struct frame_info *tmp_frame; + CORE_ADDR caller_pc; + + struct minimal_symbol *min_frame_symbol; + struct symbol *frame_symbol; + char *frame_symbol_name; + + /* If this is a threaded application, and we see the + routine "__pthread_exit", treat it as the stack root + for this thread. */ + min_frame_symbol = lookup_minimal_symbol_by_pc (frame->pc); + frame_symbol = find_pc_function(frame->pc); + + if ((min_frame_symbol != 0) /* && (frame_symbol == 0) */) + { + /* The test above for "no user function name" would defend + against the slim likelihood that a user might define a + routine named "__pthread_exit" and then try to debug it. + + If it weren't commented out, and you tried to debug the + pthread library itself, you'd get errors. + + So for today, we don't make that check. */ + frame_symbol_name = SYMBOL_NAME(min_frame_symbol); + if (frame_symbol_name != 0) { + if (0 == strncmp(frame_symbol_name, + THREAD_INITIAL_FRAME_SYMBOL, + THREAD_INITIAL_FRAME_SYM_LEN)) { + /* Pretend we've reached the bottom of the stack. */ + return (CORE_ADDR) 0; + } + } + } /* End of hacky code for threads. */ + /* Handle HPUX, BSD, and OSF1 style interrupt frames first. These are easy; at *sp we have a full save state strucutre which we can pull the old stack pointer from. Also see frame_saved_pc for @@ -1036,19 +1164,29 @@ frame_chain (frame) /* Get frame sizes for the current frame and the frame of the caller. */ my_framesize = find_proc_framesize (frame->pc); + caller_pc = FRAME_SAVED_PC(frame); + + /* If we can't determine the caller's PC, then it's not likely we can + really determine anything meaningful about its frame. We'll consider + this to be stack bottom. */ + if (caller_pc == (CORE_ADDR) 0) + return (CORE_ADDR) 0; + caller_framesize = find_proc_framesize (FRAME_SAVED_PC(frame)); /* If caller does not have a frame pointer, then its frame can be found at current_frame - caller_framesize. */ if (caller_framesize != -1) - return frame_base - caller_framesize; - + { + return frame_base - caller_framesize; + } /* Both caller and callee have frame pointers and are GCC compiled (SAVE_SP bit in unwind descriptor is on for both functions. The previous frame pointer is found at the top of the current frame. */ if (caller_framesize == -1 && my_framesize == -1) - return read_memory_integer (frame_base, 4); - + { + return read_memory_integer (frame_base, 4); + } /* Caller has a frame pointer, but callee does not. This is a little more difficult as GCC and HP C lay out locals and callee register save areas very differently. @@ -1076,8 +1214,14 @@ frame_chain (frame) think anyone has actually written any tools (not even "strip") which leave them out of an executable, so maybe this is a moot point. */ + /* ??rehrauer: Actually, it's quite possible to stepi your way into + code that doesn't have unwind entries. For example, stepping into + the dynamic linker will give you a PC that has none. Thus, I've + disabled this warning. */ +#if 0 warning ("Unable to find unwind for PC 0x%x -- Help!", tmp_frame->pc); - return 0; +#endif + return (CORE_ADDR) 0; } /* Entry_GR specifies the number of callee-saved general registers @@ -1097,7 +1241,9 @@ frame_chain (frame) if (u->Save_SP && !tmp_frame->signal_handler_caller && !pc_in_interrupt_handler (tmp_frame->pc)) - return read_memory_integer (tmp_frame->frame, 4); + { + return read_memory_integer (tmp_frame->frame, 4); + } /* %r3 was saved somewhere in the stack. Dig it out. */ else { @@ -1141,9 +1287,13 @@ frame_chain (frame) { u = find_unwind_entry (FRAME_SAVED_PC (frame)); if (!u) - return read_memory_integer (saved_regs.regs[FP_REGNUM], 4); + { + return read_memory_integer (saved_regs.regs[FP_REGNUM], 4); + } else - return frame_base - (u->Total_frame_size << 3); + { + return frame_base - (u->Total_frame_size << 3); + } } return read_memory_integer (saved_regs.regs[FP_REGNUM], 4); @@ -1169,14 +1319,18 @@ frame_chain (frame) { u = find_unwind_entry (FRAME_SAVED_PC (frame)); if (!u) - return read_memory_integer (saved_regs.regs[FP_REGNUM], 4); + { + return read_memory_integer (saved_regs.regs[FP_REGNUM], 4); + } else - return frame_base - (u->Total_frame_size << 3); + { + return frame_base - (u->Total_frame_size << 3); + } } /* The value in %r3 was never saved into the stack (thus %r3 still holds the value of the previous frame pointer). */ - return read_register (FP_REGNUM); + return TARGET_READ_FP (); } } @@ -1230,7 +1384,7 @@ hppa_frame_chain_valid (chain, thisframe) /* If this frame does not save SP, has no stack, isn't a stub, and doesn't "call" an interrupt routine or signal handler caller, then its not valid. */ - if (u->Save_SP || u->Total_frame_size || u->stub_type != 0 + if (u->Save_SP || u->Total_frame_size || u->stub_unwind.stub_type != 0 || (thisframe->next && thisframe->next->signal_handler_caller) || (next_u && next_u->HP_UX_interrupt_marker)) return 1; @@ -1242,11 +1396,10 @@ hppa_frame_chain_valid (chain, thisframe) } /* - * These functions deal with saving and restoring register state - * around a function call in the inferior. They keep the stack - * double-word aligned; eventually, on an hp700, the stack will have - * to be aligned to a 64-byte boundary. - */ + These functions deal with saving and restoring register state + around a function call in the inferior. They keep the stack + double-word aligned; eventually, on an hp700, the stack will have + to be aligned to a 64-byte boundary. */ void push_dummy_frame (inf_status) @@ -1295,7 +1448,7 @@ push_dummy_frame (inf_status) int_buffer = read_register (RP_REGNUM) | 0x3; write_memory (sp - 20, (char *)&int_buffer, 4); - int_buffer = read_register (FP_REGNUM); + int_buffer = TARGET_READ_FP (); write_memory (sp, (char *)&int_buffer, 4); write_register (FP_REGNUM, sp); @@ -1446,9 +1599,8 @@ hppa_pop_frame () flush_cached_frames (); } -/* - * After returning to a dummy on the stack, restore the instruction - * queue space registers. */ +/* After returning to a dummy on the stack, restore the instruction + queue space registers. */ static int restore_pc_queue (fsr) @@ -1463,17 +1615,15 @@ restore_pc_queue (fsr) write_register (PCOQ_HEAD_REGNUM, pc + 4); write_register (PCOQ_TAIL_REGNUM, pc + 8); - /* - * HPUX doesn't let us set the space registers or the space - * registers of the PC queue through ptrace. Boo, hiss. - * Conveniently, the call dummy has this sequence of instructions - * after the break: - * mtsp r21, sr0 - * ble,n 0(sr0, r22) - * - * So, load up the registers and single step until we are in the - * right place. - */ + /* HPUX doesn't let us set the space registers or the space + registers of the PC queue through ptrace. Boo, hiss. + Conveniently, the call dummy has this sequence of instructions + after the break: + mtsp r21, sr0 + ble,n 0(sr0, r22) + + So, load up the registers and single step until we are in the + right place. */ write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM], 4)); write_register (22, new_pc); @@ -1504,6 +1654,7 @@ restore_pc_queue (fsr) return 1; } +#if 0 CORE_ADDR hppa_push_arguments (nargs, args, sp, struct_return, struct_addr) int nargs; @@ -1519,14 +1670,19 @@ hppa_push_arguments (nargs, args, sp, struct_return, struct_addr) for (i = 0; i < nargs; i++) { + int x = 0; + /* cum is the sum of the lengths in bytes of + the arguments seen so far */ cum += TYPE_LENGTH (VALUE_TYPE (args[i])); /* value must go at proper alignment. Assume alignment is a - power of two.*/ + power of two. */ alignment = hppa_alignof (VALUE_TYPE (args[i])); + if (cum % alignment) cum = (cum + alignment) & -alignment; offset[i] = -cum; + } sp += max ((cum + 7) & -8, 16); @@ -1538,16 +1694,240 @@ hppa_push_arguments (nargs, args, sp, struct_return, struct_addr) write_register (28, struct_addr); return sp + 32; } +#endif -/* - * Insert the specified number of args and function address - * into a call sequence of the above form stored at DUMMYNAME. - * - * On the hppa we need to call the stack dummy through $$dyncall. - * Therefore our version of FIX_CALL_DUMMY takes an extra argument, - * real_pc, which is the location where gdb should start up the - * inferior to do the function call. - */ +/* elz: I am rewriting this function, because the one above is a very + obscure piece of code. + This function pushes the arguments on the stack. The stack grows up + on the PA. + Each argument goes in one (or more) word (4 bytes) on the stack. + The first four words for the args must be allocated, even if they + are not used. + The 'topmost' arg is arg0, the 'bottom-most' is arg3. (if you think of + them as 1 word long). + Below these there can be any number of arguments, as needed by the function. + If an arg is bigger than one word, it will be written on the stack + occupying as many words as needed. Args that are bigger than 64bits + are not copied on the stack, a pointer is passed instead. + + On top of the arg0 word there are other 8 words (32bytes) which are used + for other purposes */ + +CORE_ADDR +hppa_push_arguments (nargs, args, sp, struct_return, struct_addr) + int nargs; + value_ptr *args; + CORE_ADDR sp; + int struct_return; + CORE_ADDR struct_addr; +{ + /* array of arguments' offsets */ + int *offset = (int *)alloca(nargs * sizeof (int)); + /* array of arguments' lengths: real lengths in bytes, not aligned to word size */ + int *lengths = (int *)alloca(nargs * sizeof (int)); + + int bytes_reserved; /* this is the number of bytes on the stack occupied by an + argument. This will be always a multiple of 4 */ + + int cum_bytes_reserved = 0; /* this is the total number of bytes reserved by the args + seen so far. It is a multiple of 4 always */ + int cum_bytes_aligned = 0; /* same as above, but aligned on 8 bytes */ + int i; + + /* When an arg does not occupy a whole word, for instance in bitfields: + if the arg is x bits (0<x<32), it must be written + starting from the (x-1)-th position down until the 0-th position. + It is enough to align it to the word. */ + /* if an arg occupies 8 bytes, it must be aligned on the 64-bits + high order word in odd arg word. */ + /* if an arg is larger than 64 bits, we need to pass a pointer to it, and + copy the actual value on the stack, so that the callee can play with it. + This is taken care of in valops.c in the call_function_by_hand function. + The argument that is received in this function here has already be converted + to a pointer to whatever is needed, so that it just can be pushed + as a word argument */ + + for (i = 0; i < nargs; i++) + { + + lengths[i] = TYPE_LENGTH (VALUE_TYPE (args[i])); + + if (lengths[i] % 4) + bytes_reserved = (lengths[i] / 4) * 4 + 4; + else + bytes_reserved = lengths[i]; + + offset[i] = cum_bytes_reserved + lengths[i]; + + if ((bytes_reserved == 8) && (offset[i] % 8)) /* if 64-bit arg is not 64 bit aligned */ + { + int new_offset=0; + /* bytes_reserved is already aligned to the word, so we put it at one word + more down the stack. This will leave one empty word on the + stack, and one unused register. This is OK, see the calling + convention doc */ + /* the offset may have to be moved to the corresponding position + one word down the stack, to maintain + alignment. */ + new_offset = (offset[i] / 8) * 8 + 8; + if ((new_offset - offset[i]) >=4) + { + bytes_reserved += 4; + offset[i] += 4; + } + } + + cum_bytes_reserved += bytes_reserved; + + } + + /* now move up the sp to reserve at least 4 words required for the args, + or more than this if needed */ + /* wee also need to keep the sp aligned to 8 bytes */ + cum_bytes_aligned = STACK_ALIGN (cum_bytes_reserved); + sp += max (cum_bytes_aligned, 16); + + /* now write each of the args at the proper offset down the stack */ + for (i = 0; i < nargs; i++) + write_memory (sp - offset[i], VALUE_CONTENTS (args[i]), lengths[i]); + + + /* if a structure has to be returned, set up register 28 to hold its address */ + if (struct_return) + write_register (28, struct_addr); + + /* the stack will have other 8 words on top of the args */ + return sp + 32; +} + + +/* elz: this function returns a value which is built looking at the given address. + It is called from call_function_by_hand, in case we need to return a + value which is larger than 64 bits, and it is stored in the stack rather than + in the registers r28 and r29 or fr4. + This function does the same stuff as value_being_returned in values.c, but + gets the value from the stack rather than from the buffer where all the + registers were saved when the function called completed. */ +value_ptr +hppa_value_returned_from_stack (valtype , addr) + register struct type *valtype; + CORE_ADDR addr; +{ + register value_ptr val; + + val = allocate_value (valtype); + CHECK_TYPEDEF (valtype); + target_read_memory(addr, VALUE_CONTENTS_RAW (val), TYPE_LENGTH (valtype)); + + return val; +} + + + +/* elz: Used to lookup a symbol in the shared libraries. + This function calls shl_findsym, indirectly through a + call to __d_shl_get. __d_shl_get is in end.c, which is always + linked in by the hp compilers/linkers. + The call to shl_findsym cannot be made directly because it needs + to be active in target address space. + inputs: - minimal symbol pointer for the function we want to look up + - address in target space of the descriptor for the library + where we want to look the symbol up. + This address is retrieved using the + som_solib_get_solib_by_pc function (somsolib.c). + output: - real address in the library of the function. + note: the handle can be null, in which case shl_findsym will look for + the symbol in all the loaded shared libraries. + files to look at if you need reference on this stuff: + dld.c, dld_shl_findsym.c + end.c + man entry for shl_findsym */ + +CORE_ADDR +find_stub_with_shl_get(function, handle) + struct minimal_symbol *function; + CORE_ADDR handle; +{ + struct symbol *get_sym, *symbol2; + struct minimal_symbol *buff_minsym, *msymbol; + struct type *ftype; + value_ptr *args; + value_ptr funcval, val; + + int x, namelen, err_value, tmp = -1; + CORE_ADDR endo_buff_addr, value_return_addr, errno_return_addr; + CORE_ADDR stub_addr; + + + args = (value_ptr *) alloca (sizeof (value_ptr) * 8); /* 6 for the arguments and one null one??? */ + funcval = find_function_in_inferior("__d_shl_get"); + get_sym = lookup_symbol("__d_shl_get", NULL, VAR_NAMESPACE, NULL, NULL); + buff_minsym = lookup_minimal_symbol("__buffer", NULL, NULL); + msymbol = lookup_minimal_symbol ("__shldp", NULL, NULL); + symbol2 = lookup_symbol("__shldp", NULL, VAR_NAMESPACE, NULL, NULL); + endo_buff_addr = SYMBOL_VALUE_ADDRESS (buff_minsym); + namelen = strlen(SYMBOL_NAME(function)); + value_return_addr = endo_buff_addr + namelen; + ftype = check_typedef(SYMBOL_TYPE(get_sym)); + + /* do alignment */ + if ((x=value_return_addr % 64) !=0) + value_return_addr = value_return_addr + 64 - x; + + errno_return_addr = value_return_addr + 64; + + + /* set up stuff needed by __d_shl_get in buffer in end.o */ + + target_write_memory(endo_buff_addr, SYMBOL_NAME(function), namelen); + + target_write_memory(value_return_addr, (char *) &tmp, 4); + + target_write_memory(errno_return_addr, (char *) &tmp, 4); + + target_write_memory(SYMBOL_VALUE_ADDRESS(msymbol), + (char *)&handle, 4); + + /* now prepare the arguments for the call */ + + args[0] = value_from_longest (TYPE_FIELD_TYPE(ftype, 0), 12); + args[1] = value_from_longest (TYPE_FIELD_TYPE(ftype, 1), SYMBOL_VALUE_ADDRESS(msymbol)); + args[2] = value_from_longest (TYPE_FIELD_TYPE(ftype, 2), endo_buff_addr); + args[3] = value_from_longest (TYPE_FIELD_TYPE(ftype, 3), TYPE_PROCEDURE); + args[4] = value_from_longest (TYPE_FIELD_TYPE(ftype, 4), value_return_addr); + args[5] = value_from_longest (TYPE_FIELD_TYPE(ftype, 5), errno_return_addr); + + /* now call the function */ + + val = call_function_by_hand(funcval, 6, args); + + /* now get the results */ + + target_read_memory(errno_return_addr, (char *) &err_value, sizeof(err_value)); + + target_read_memory(value_return_addr, (char *) &stub_addr, sizeof(stub_addr)); + if (stub_addr <= 0) + error("call to __d_shl_get failed, error code is %d", err_value); /* purecov: deadcode */ + + return(stub_addr); +} + +/* Cover routine for find_stub_with_shl_get to pass to catch_errors */ +static CORE_ADDR +cover_find_stub_with_shl_get (args) + args_for_find_stub * args; +{ + return find_stub_with_shl_get (args->msym, args->solib_handle); +} + + +/* Insert the specified number of args and function address + into a call sequence of the above form stored at DUMMYNAME. + + On the hppa we need to call the stack dummy through $$dyncall. + Therefore our version of FIX_CALL_DUMMY takes an extra argument, + real_pc, which is the location where gdb should start up the + inferior to do the function call. */ CORE_ADDR hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) @@ -1564,11 +1944,13 @@ hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) struct minimal_symbol *trampoline; int flags = read_register (FLAGS_REGNUM); struct unwind_table_entry *u; + CORE_ADDR new_stub=0; + CORE_ADDR solib_handle=0; trampoline = NULL; msymbol = lookup_minimal_symbol ("$$dyncall", NULL, NULL); if (msymbol == NULL) - error ("Can't find an address for $$dyncall trampoline"); + error ("Can't find an address for $$dyncall trampoline"); /* purecov: deadcode */ dyncall_addr = SYMBOL_VALUE_ADDRESS (msymbol); @@ -1593,7 +1975,16 @@ hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) function in a shared library. We must call an import stub rather than the export stub or real function for lazy binding to work correctly. */ - if (som_solib_get_got_by_pc (fun)) + + /* elz: let's see if fun is in a shared library */ + solib_handle = som_solib_get_solib_by_pc(fun); + + /* elz: for 10.30 and 11.00 the calls via __d_plt_call cannot be made + via import stubs, only via plables, so this code here becomes useless. + On 10.20, the plables mechanism works too, so we just ignore this import + stub stuff */ +#if 0 + if (solib_handle) { struct objfile *objfile; struct minimal_symbol *funsymbol, *stub_symbol; @@ -1619,7 +2010,7 @@ hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) /* It must also be an import stub. */ u = find_unwind_entry (SYMBOL_VALUE (stub_symbol)); - if (!u || u->stub_type != IMPORT) + if (!u || u->stub_unwind.stub_type != IMPORT) continue; /* OK. Looks like the correct import stub. */ @@ -1630,6 +2021,7 @@ hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) if (newfun == 0) write_register (19, som_solib_get_got_by_pc (fun)); } +#endif /* end of if 0 */ #endif } @@ -1639,8 +2031,28 @@ hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) the value in sp-24 will get fried and you end up returning to the wrong location. You can't call the import stub directly as the code to bind the PLT entry to a function can't return to a stack address.) */ + + /* elz: + There does not have to be an import stub to call a routine in a + different load module (note: a "load module" is an a.out or a shared + library). If you call a routine indirectly, going through $$dyncall (or + $$dyncall_external), you won't go through an import stub. Import stubs + are only used for direct calls to an imported routine. + + What you (wdb) need is to go through $$dyncall with a proper plabel for + the imported routine. shl_findsym() returns you the address of a plabel + suitable for use in making an indirect call through, e.g., through + $$dyncall. + This is taken care below with the call to find_stub_.... */ +#if 0 + /* elz: this check here is not necessary if we are going to call stuff through + plabels only, we just now check whether the function we call is in a shlib */ u = find_unwind_entry (fun); - if (u && u->stub_type == IMPORT) + + if (u && u->stub_unwind.stub_type == IMPORT || + (!(u && u->stub_unwind.stub_type == IMPORT) && solib_handle)) +#endif /* 0 */ + if (solib_handle) { CORE_ADDR new_fun; @@ -1651,25 +2063,47 @@ hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) trampoline = lookup_minimal_symbol ("__d_plt_call", NULL, NULL); if (trampoline == NULL) - error ("Can't find an address for __d_plt_call or __gcc_plt_call trampoline"); - + { + error ("Can't find an address for __d_plt_call or __gcc_plt_call trampoline\nSuggest linking executable with -g (links in /opt/langtools/lib/end.o)"); + } /* This is where sr4export will jump to. */ new_fun = SYMBOL_VALUE_ADDRESS (trampoline); if (strcmp (SYMBOL_NAME (trampoline), "__d_plt_call") == 0) { + /* if the function is in a shared library, but we have no import sub for + it, we need to get the plabel from a call to __d_shl_get, which is a + function in end.o. To call this function we need to set up various things */ + + /* actually now we just use the plabel any time we make the call, + because on 10.30 and 11.00 this is the only acceptable way. This also + works fine for 10.20 */ + /* if (!(u && u->stub_unwind.stub_type == IMPORT) && solib_handle) */ + { + struct minimal_symbol *fmsymbol = lookup_minimal_symbol_by_pc(fun); + + new_stub = find_stub_with_shl_get(fmsymbol, solib_handle); + + if (new_stub == NULL) + error("Can't find an import stub for %s", SYMBOL_NAME(fmsymbol)); /* purecov: deadcode */ + } + /* We have to store the address of the stub in __shlib_funcptr. */ - msymbol = lookup_minimal_symbol ("__shlib_funcptr", NULL, - (struct objfile *)NULL); - if (msymbol == NULL) - error ("Can't find an address for __shlib_funcptr"); + msymbol = lookup_minimal_symbol ("__shlib_funcptr", NULL, + (struct objfile *)NULL); + if (msymbol == NULL) + error ("Can't find an address for __shlib_funcptr"); /* purecov: deadcode */ - target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), (char *)&fun, 4); + /* if (new_stub != NULL) */ + target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), (char *)&new_stub, 4); + /* this is no longer used */ + /* else + target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), (char *)&fun, 4); */ /* We want sr4export to call __d_plt_call, so we claim it is the final target. Clear trampoline. */ - fun = new_fun; - trampoline = NULL; + fun = new_fun; + trampoline = NULL; } } @@ -1701,7 +2135,7 @@ hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) { msymbol = lookup_minimal_symbol ("_sr4export", NULL, NULL); if (msymbol == NULL) - error ("Can't find an address for _sr4export trampoline"); + error ("Can't find an address for _sr4export trampoline"); /* purecov: deadcode */ trampoline_addr = SYMBOL_VALUE_ADDRESS (msymbol); } @@ -1749,6 +2183,28 @@ hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) } + + + +/* If the pid is in a syscall, then the FP register is not readable. + We'll return zero in that case, rather than attempting to read it + and cause a warning. */ +CORE_ADDR +target_read_fp (pid) + int pid; +{ + int flags = read_register (FLAGS_REGNUM); + + if (flags & 2) { + return (CORE_ADDR) 0; + } + + /* This is the only site that may directly read_register () the FP + register. All others must use TARGET_READ_FP (). */ + return read_register (FP_REGNUM); +} + + /* Get the PC from %r31 if currently in a syscall. Also mask out privilege bits. */ @@ -1812,7 +2268,8 @@ hppa_alignof (type) for (i = 0; i < TYPE_NFIELDS (type); i++) { /* Bit fields have no real alignment. */ - if (!TYPE_FIELD_BITPOS (type, i)) + /* if (!TYPE_FIELD_BITPOS (type, i)) */ + if (!TYPE_FIELD_BITSIZE (type, i)) /* elz: this should be bitsize */ { align = hppa_alignof (TYPE_FIELD_TYPE (type, i)); max_align = max (max_align, align); @@ -1833,18 +2290,177 @@ pa_do_registers_info (regnum, fpregs) { char raw_regs [REGISTER_BYTES]; int i; - + + /* Make a copy of gdb's save area (may cause actual + reads from the target). */ for (i = 0; i < NUM_REGS; i++) read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i)); + if (regnum == -1) pa_print_registers (raw_regs, regnum, fpregs); - else if (regnum < FP0_REGNUM) - printf_unfiltered ("%s %x\n", REGISTER_NAME (regnum), *(long *)(raw_regs + - REGISTER_BYTE (regnum))); + else if (regnum < FP4_REGNUM) { + long reg_val[2]; + + /* Why is the value not passed through "extract_signed_integer" + as in "pa_print_registers" below? */ + pa_register_look_aside(raw_regs, regnum, ®_val[0]); + + if(!is_pa_2) { + printf_unfiltered ("%s %x\n", REGISTER_NAME (regnum), reg_val[1]); + } + else { + /* Fancy % formats to prevent leading zeros. */ + if(reg_val[0] == 0) + printf_unfiltered("%s %x\n", REGISTER_NAME (regnum), reg_val[1]); + else + printf_unfiltered("%s %x%8.8x\n", REGISTER_NAME (regnum), + reg_val[0], reg_val[1]); + } + } else + /* Note that real floating point values only start at + FP4_REGNUM. FP0 and up are just status and error + registers, which have integral (bit) values. */ pa_print_fp_reg (regnum); } +/********** new function ********************/ +void +pa_do_strcat_registers_info (regnum, fpregs, stream, precision) + int regnum; + int fpregs; + GDB_FILE *stream; + enum precision_type precision; +{ + char raw_regs [REGISTER_BYTES]; + int i; + + /* Make a copy of gdb's save area (may cause actual + reads from the target). */ + for (i = 0; i < NUM_REGS; i++) + read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i)); + + if (regnum == -1) + pa_strcat_registers (raw_regs, regnum, fpregs, stream); + + else if (regnum < FP4_REGNUM) { + long reg_val[2]; + + /* Why is the value not passed through "extract_signed_integer" + as in "pa_print_registers" below? */ + pa_register_look_aside(raw_regs, regnum, ®_val[0]); + + if(!is_pa_2) { + fprintf_unfiltered (stream, "%s %x", REGISTER_NAME (regnum), reg_val[1]); + } + else { + /* Fancy % formats to prevent leading zeros. */ + if(reg_val[0] == 0) + fprintf_unfiltered(stream, "%s %x", REGISTER_NAME (regnum), + reg_val[1]); + else + fprintf_unfiltered(stream, "%s %x%8.8x", REGISTER_NAME (regnum), + reg_val[0], reg_val[1]); + } + } + else + /* Note that real floating point values only start at + FP4_REGNUM. FP0 and up are just status and error + registers, which have integral (bit) values. */ + pa_strcat_fp_reg (regnum, stream, precision); +} + +/* If this is a PA2.0 machine, fetch the real 64-bit register + value. Otherwise use the info from gdb's saved register area. + + Note that reg_val is really expected to be an array of longs, + with two elements. */ +static void +pa_register_look_aside(raw_regs, regnum, raw_val) + char *raw_regs; + int regnum; + long *raw_val; +{ + static int know_which = 0; /* False */ + + int regaddr; + unsigned int offset; + register int i; + int start; + + + char buf[MAX_REGISTER_RAW_SIZE]; + long long reg_val; + + if(!know_which) { + if(CPU_PA_RISC2_0 == sysconf(_SC_CPU_VERSION)) { + is_pa_2 = (1==1); + } + + know_which = 1; /* True */ + } + + raw_val[0] = 0; + raw_val[1] = 0; + + if(!is_pa_2) { + raw_val[1] = *(long *)(raw_regs + REGISTER_BYTE(regnum)); + return; + } + + /* Code below copied from hppah-nat.c, with fixes for wide + registers, using different area of save_state, etc. */ + if(regnum == FLAGS_REGNUM || regnum >= FP0_REGNUM) { + /* Use narrow regs area of save_state and default macro. */ + offset = U_REGS_OFFSET; + regaddr = register_addr(regnum, offset); + start = 1; + } + else { + /* Use wide regs area, and calculate registers as 8 bytes wide. + + We'd like to do this, but current version of "C" doesn't + permit "offsetof": + + offset = offsetof(save_state_t, ss_wide); + + Note that to avoid "C" doing typed pointer arithmetic, we + have to cast away the type in our offset calculation: + otherwise we get an offset of 1! */ + save_state_t temp; + offset = ((int) &temp.ss_wide) - ((int) &temp); + regaddr = offset + regnum * 8; + start = 0; + } + + for(i = start; i < 2; i++) + { + errno = 0; + raw_val[i] = call_ptrace (PT_RUREGS, inferior_pid, + (PTRACE_ARG3_TYPE) regaddr, 0); + if (errno != 0) + { + /* Warning, not error, in case we are attached; sometimes the + kernel doesn't let us at the registers. */ + char *err = safe_strerror (errno); + char *msg = alloca (strlen (err) + 128); + sprintf (msg, "reading register %s: %s", REGISTER_NAME (regnum), err); + warning (msg); + goto error_exit; + } + + regaddr += sizeof (long); + } + + if (regnum == PCOQ_HEAD_REGNUM || regnum == PCOQ_TAIL_REGNUM) + raw_val[1] &= ~0x3; /* I think we're masking out space bits */ + +error_exit: + ; +} + +/* "Info all-reg" command */ + static void pa_print_registers (raw_regs, regnum, fpregs) char *raw_regs; @@ -1852,30 +2468,101 @@ pa_print_registers (raw_regs, regnum, fpregs) int fpregs; { int i,j; - long val; + long raw_val[2]; /* Alas, we are compiled so that "long long" is 32 bits */ + long long_val; for (i = 0; i < 18; i++) { for (j = 0; j < 4; j++) { - val = - extract_signed_integer (raw_regs + REGISTER_BYTE (i+(j*18)), 4); - printf_unfiltered ("%8.8s: %8x ", REGISTER_NAME (i+(j*18)), val); + /* Q: Why is the value passed through "extract_signed_integer", + while above, in "pa_do_registers_info" it isn't? + A: ? */ + pa_register_look_aside(raw_regs, i+(j*18), &raw_val[0]); + + /* Even fancier % formats to prevent leading zeros + and still maintain the output in columns. */ + if(!is_pa_2) { + /* Being big-endian, on this machine the low bits + (the ones we want to look at) are in the second longword. */ + long_val = extract_signed_integer (&raw_val[1], 4); + printf_filtered ("%8.8s: %8x ", + REGISTER_NAME (i+(j*18)), long_val); + } + else { + /* raw_val = extract_signed_integer(&raw_val, 8); */ + if(raw_val[0] == 0) + printf_filtered("%8.8s: %8x ", + REGISTER_NAME (i+(j*18)), raw_val[1]); + else + printf_filtered("%8.8s: %8x%8.8x ", REGISTER_NAME (i+(j*18)), + raw_val[0], raw_val[1]); + } } printf_unfiltered ("\n"); } if (fpregs) - for (i = 72; i < NUM_REGS; i++) + for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */ pa_print_fp_reg (i); } +/************* new function ******************/ +static void +pa_strcat_registers (raw_regs, regnum, fpregs, stream) + char *raw_regs; + int regnum; + int fpregs; + GDB_FILE *stream; +{ + int i,j; + long raw_val[2]; /* Alas, we are compiled so that "long long" is 32 bits */ + long long_val; + enum precision_type precision; + + precision = unspecified_precision; + + for (i = 0; i < 18; i++) + { + for (j = 0; j < 4; j++) + { + /* Q: Why is the value passed through "extract_signed_integer", + while above, in "pa_do_registers_info" it isn't? + A: ? */ + pa_register_look_aside(raw_regs, i+(j*18), &raw_val[0]); + + /* Even fancier % formats to prevent leading zeros + and still maintain the output in columns. */ + if(!is_pa_2) { + /* Being big-endian, on this machine the low bits + (the ones we want to look at) are in the second longword. */ + long_val = extract_signed_integer(&raw_val[1], 4); + fprintf_filtered (stream, "%8.8s: %8x ", REGISTER_NAME (i+(j*18)), long_val); + } + else { + /* raw_val = extract_signed_integer(&raw_val, 8); */ + if(raw_val[0] == 0) + fprintf_filtered(stream, "%8.8s: %8x ", REGISTER_NAME (i+(j*18)), + raw_val[1]); + else + fprintf_filtered(stream, "%8.8s: %8x%8.8x ", REGISTER_NAME (i+(j*18)), + raw_val[0], raw_val[1]); + } + } + fprintf_unfiltered (stream, "\n"); + } + + if (fpregs) + for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */ + pa_strcat_fp_reg (i, stream, precision); +} + static void pa_print_fp_reg (i) int i; { - unsigned char raw_buffer[MAX_REGISTER_RAW_SIZE]; - unsigned char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; + char raw_buffer[MAX_REGISTER_RAW_SIZE]; + char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; /* Get 32bits of data. */ read_relative_register_raw_bytes (i, raw_buffer); @@ -1913,6 +2600,47 @@ pa_print_fp_reg (i) } } +/*************** new function ***********************/ +static void +pa_strcat_fp_reg (i, stream, precision) + int i; + GDB_FILE *stream; + enum precision_type precision; +{ + char raw_buffer[MAX_REGISTER_RAW_SIZE]; + char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; + + fputs_filtered (REGISTER_NAME (i), stream); + print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), stream); + + /* Get 32bits of data. */ + read_relative_register_raw_bytes (i, raw_buffer); + + /* Put it in the buffer. No conversions are ever necessary. */ + memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i)); + + if (precision == double_precision && (i % 2) == 0) + { + + char raw_buf[MAX_REGISTER_RAW_SIZE]; + + /* Get the data in raw format for the 2nd half. */ + read_relative_register_raw_bytes (i + 1, raw_buf); + + /* Copy it into the appropriate part of the virtual buffer. */ + memcpy (virtual_buffer + REGISTER_RAW_SIZE(i), raw_buf, REGISTER_RAW_SIZE (i)); + + val_print (builtin_type_double, virtual_buffer, 0, 0 , stream, 0, + 1, 0, Val_pretty_default); + + } + else { + val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, stream, 0, + 1, 0, Val_pretty_default); + } + +} + /* Return one if PC is in the call path of a trampoline, else return zero. Note we return one for *any* call trampoline (long-call, arg-reloc), not @@ -1960,23 +2688,23 @@ in_solib_call_trampoline (pc, name) return 0; /* If this isn't a linker stub, then return now. */ - if (u->stub_type == 0) + if (u->stub_unwind.stub_type == 0) return 0; /* By definition a long-branch stub is a call stub. */ - if (u->stub_type == LONG_BRANCH) + if (u->stub_unwind.stub_type == LONG_BRANCH) return 1; /* The call and return path execute the same instructions within an IMPORT stub! So an IMPORT stub is both a call and return trampoline. */ - if (u->stub_type == IMPORT) + if (u->stub_unwind.stub_type == IMPORT) return 1; /* Parameter relocation stubs always have a call path and may have a return path. */ - if (u->stub_type == PARAMETER_RELOCATION - || u->stub_type == EXPORT) + if (u->stub_unwind.stub_type == PARAMETER_RELOCATION + || u->stub_unwind.stub_type == EXPORT) { CORE_ADDR addr; @@ -1998,12 +2726,12 @@ in_solib_call_trampoline (pc, name) } /* Should never happen. */ - warning ("Unable to find branch in parameter relocation stub.\n"); - return 0; + warning ("Unable to find branch in parameter relocation stub.\n"); /* purecov: deadcode */ + return 0; /* purecov: deadcode */ } /* Unknown stub type. For now, just return zero. */ - return 0; + return 0; /* purecov: deadcode */ } /* Return one if PC is in the return path of a trampoline, else return zero. @@ -2026,19 +2754,19 @@ in_solib_return_trampoline (pc, name) /* If this isn't a linker stub or it's just a long branch stub, then return zero. */ - if (u->stub_type == 0 || u->stub_type == LONG_BRANCH) + if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH) return 0; /* The call and return path execute the same instructions within an IMPORT stub! So an IMPORT stub is both a call and return trampoline. */ - if (u->stub_type == IMPORT) + if (u->stub_unwind.stub_type == IMPORT) return 1; /* Parameter relocation stubs always have a call path and may have a return path. */ - if (u->stub_type == PARAMETER_RELOCATION - || u->stub_type == EXPORT) + if (u->stub_unwind.stub_type == PARAMETER_RELOCATION + || u->stub_unwind.stub_type == EXPORT) { CORE_ADDR addr; @@ -2060,12 +2788,12 @@ in_solib_return_trampoline (pc, name) } /* Should never happen. */ - warning ("Unable to find branch in parameter relocation stub.\n"); - return 0; + warning ("Unable to find branch in parameter relocation stub.\n"); /* purecov: deadcode */ + return 0; /* purecov: deadcode */ } /* Unknown stub type. For now, just return zero. */ - return 0; + return 0; /* purecov: deadcode */ } @@ -2086,6 +2814,17 @@ in_solib_return_trampoline (pc, name) calling an argument relocation stub. It even handles some stubs used in dynamic executables. */ +# if 0 +CORE_ADDR +skip_trampoline_code (pc, name) + CORE_ADDR pc; + char *name; +{ + return find_solib_trampoline_target(pc); +} + +#endif + CORE_ADDR skip_trampoline_code (pc, name) CORE_ADDR pc; @@ -2094,10 +2833,12 @@ skip_trampoline_code (pc, name) long orig_pc = pc; long prev_inst, curr_inst, loc; static CORE_ADDR dyncall = 0; + static CORE_ADDR dyncall_external = 0; static CORE_ADDR sr4export = 0; struct minimal_symbol *msym; struct unwind_table_entry *u; + /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a new exec file */ @@ -2110,6 +2851,15 @@ skip_trampoline_code (pc, name) dyncall = -1; } + if (!dyncall_external) + { + msym = lookup_minimal_symbol ("$$dyncall_external", NULL, NULL); + if (msym) + dyncall_external = SYMBOL_VALUE_ADDRESS (msym); + else + dyncall_external = -1; + } + if (!sr4export) { msym = lookup_minimal_symbol ("_sr4export", NULL, NULL); @@ -2131,6 +2881,11 @@ skip_trampoline_code (pc, name) if (pc & 0x2) pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, 4); } + if (pc == dyncall_external) + { + pc = (CORE_ADDR) read_register (22); + pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, 4); + } else if (pc == sr4export) pc = (CORE_ADDR) (read_register (22)); @@ -2141,13 +2896,77 @@ skip_trampoline_code (pc, name) return 0; /* If this isn't a linker stub, then return now. */ - if (u->stub_type == 0) - return orig_pc == pc ? 0 : pc & ~0x3; + /* elz: attention here! (FIXME) because of a compiler/linker + error, some stubs which should have a non zero stub_unwind.stub_type + have unfortunately a value of zero. So this function would return here + as if we were not in a trampoline. To fix this, we go look at the partial + symbol information, which reports this guy as a stub. + (FIXME): Unfortunately, we are not that lucky: it turns out that the + partial symbol information is also wrong sometimes. This is because + when it is entered (somread.c::som_symtab_read()) it can happen that + if the type of the symbol (from the som) is Entry, and the symbol is + in a shared library, then it can also be a trampoline. This would + be OK, except that I believe the way they decide if we are ina shared library + does not work. SOOOO..., even if we have a regular function w/o trampolines + its minimal symbol can be assigned type mst_solib_trampoline. + Also, if we find that the symbol is a real stub, then we fix the unwind + descriptor, and define the stub type to be EXPORT. + Hopefully this is correct most of the times. */ + if (u->stub_unwind.stub_type == 0) + { + +/* elz: NOTE (FIXME!) once the problem with the unwind information is fixed + we can delete all the code which appears between the lines */ +/*--------------------------------------------------------------------------*/ + msym = lookup_minimal_symbol_by_pc (pc); + + if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline) + return orig_pc == pc ? 0 : pc & ~0x3; + + else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline) + { + struct objfile *objfile; + struct minimal_symbol *msymbol; + int function_found = 0; + + /* go look if there is another minimal symbol with the same name as + this one, but with type mst_text. This would happen if the msym + is an actual trampoline, in which case there would be another + symbol with the same name corresponding to the real function */ + + ALL_MSYMBOLS (objfile, msymbol) + { + if (MSYMBOL_TYPE (msymbol) == mst_text + && STREQ (SYMBOL_NAME (msymbol) , SYMBOL_NAME (msym))) + { + function_found = 1; + break; + } + } + + if (function_found) + /* the type of msym is correct (mst_solib_trampoline), but + the unwind info is wrong, so set it to the correct value */ + u->stub_unwind.stub_type = EXPORT; + else + /* the stub type info in the unwind is correct (this is not a + trampoline), but the msym type information is wrong, it + should be mst_text. So we need to fix the msym, and also + get out of this function */ + { + MSYMBOL_TYPE (msym) = mst_text; + return orig_pc == pc ? 0 : pc & ~0x3; + } + } + +/*--------------------------------------------------------------------------*/ + } /* It's a stub. Search for a branch and figure out where it goes. Note we have to handle multi insn branch sequences like ldil;ble. Most (all?) other branches can be determined by examining the contents of certain registers and the stack. */ + loc = pc; curr_inst = 0; prev_inst = 0; @@ -2178,7 +2997,11 @@ skip_trampoline_code (pc, name) } } - /* Does it look like a be 0(sr0,%r21)? That's the branch from an + /* Does it look like a be 0(sr0,%r21)? OR + Does it look like a be, n 0(sr0,%r21)? OR + Does it look like a bve (r21)? (this is on PA2.0) + Does it look like a bve, n(r21)? (this is also on PA2.0) + That's the branch from an import stub to an export stub. It is impossible to determine the target of the branch via @@ -2195,7 +3018,10 @@ skip_trampoline_code (pc, name) Then lookup a minimal symbol with the same name; we should get the minimal symbol for the target routine in the shared library as those take precedence of import/export stubs. */ - if (curr_inst == 0xe2a00000) + if ((curr_inst == 0xe2a00000) || + (curr_inst == 0xe2a00002) || + (curr_inst == 0xeaa0d000) || + (curr_inst == 0xeaa0d002)) { struct minimal_symbol *stubsym, *libsym; @@ -2219,15 +3045,18 @@ skip_trampoline_code (pc, name) /* Does it look like bl X,%rp or bl X,%r0? Another way to do a branch from the stub to the actual function. */ + /*elz*/ else if ((curr_inst & 0xffe0e000) == 0xe8400000 - || (curr_inst & 0xffe0e000) == 0xe8000000) + || (curr_inst & 0xffe0e000) == 0xe8000000 + || (curr_inst & 0xffe0e000) == 0xe800A000) return (loc + extract_17 (curr_inst) + 8) & ~0x3; /* Does it look like bv (rp)? Note this depends on the current stack pointer being the same as the stack pointer in the stub itself! This is a branch on from the stub back to the original caller. */ - else if ((curr_inst & 0xffe0e000) == 0xe840c000) + /*else if ((curr_inst & 0xffe0e000) == 0xe840c000)*/ + else if ((curr_inst & 0xffe0f000) == 0xe840c000) { /* Yup. See if the previous instruction loaded rp from sp - 8. */ @@ -2241,6 +3070,15 @@ skip_trampoline_code (pc, name) } } + /* elz: added this case to capture the new instruction + at the end of the return part of an export stub used by + the PA2.0: BVE, n (rp) */ + else if ((curr_inst & 0xffe0f000) == 0xe840d000) + { + return (read_memory_integer + (read_register (SP_REGNUM) - 24, 4)) & ~0x3; + } + /* What about be,n 0(sr0,%rp)? It's just another way we return to the original caller from the stub. Used in dynamic executables. */ else if (curr_inst == 0xe0400002) @@ -2259,6 +3097,7 @@ skip_trampoline_code (pc, name) } } + /* For the given instruction (INST), return any adjustment it makes to the stack pointer or zero for no adjustment. @@ -2363,8 +3202,12 @@ static int inst_saves_fr (inst) unsigned long inst; { + /* is this an FSTDS ?*/ if ((inst & 0xfc00dfc0) == 0x2c001200) return extract_5r_store (inst); + /* is this an FSTWS ?*/ + if ((inst & 0xfc00df80) == 0x24001200) + return extract_5r_store (inst); return 0; } @@ -2374,8 +3217,9 @@ inst_saves_fr (inst) Use information in the unwind table to determine what exactly should be in the prologue. */ + CORE_ADDR -skip_prologue (pc) +skip_prologue_hard_way (pc) CORE_ADDR pc; { char buf[4]; @@ -2392,7 +3236,7 @@ restart: if (!u) return pc; - /* If we are not at the beginning of a function, then return now. */ + /* If we are not at the beginning of a function, then return now. */ if ((pc & ~0x3) != u->region_start) return pc; @@ -2592,6 +3436,162 @@ restart: return pc; } + + + + +/* return 0 if we cannot determine the end of the prologue, + return the new pc value if we know where the prologue ends */ + +static CORE_ADDR +after_prologue (pc) + CORE_ADDR pc; +{ + struct symtab_and_line sal; + CORE_ADDR func_addr, func_end; + struct symbol *f; + + if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end)) + return 0; /* Unknown */ + + f = find_pc_function (pc); + if (!f) + return 0; /* no debug info, do it the hard way! */ + + sal = find_pc_line (func_addr, 0); + + if (sal.end < func_end) + { + /* this happens when the function has no prologue, because the way + find_pc_line works: elz. Note: this may not be a very good + way to decide whether a function has a prologue or not, but + it is the best I can do with the info available + Also, this will work for functions like: int f() + { + return 2; + } + I.e. the bp will be inserted at the first open brace. + For functions where the body is only one line written like this: + int f() + { return 2; } + this will make the breakpoint to be at the last brace, after the body + has been executed already. What's the point of stepping through a function + without any variables anyway?? */ + + if ((SYMBOL_LINE(f) > 0) && (SYMBOL_LINE(f) < sal.line)) + return pc; /*no adjusment will be made*/ + else + return sal.end; /* this is the end of the prologue */ + } + /* The line after the prologue is after the end of the function. In this + case, put the end of the prologue is the beginning of the function. */ + /* This should happen only when the function is prologueless and has no + code in it. For instance void dumb(){} Note: this kind of function + is used quite a lot in the test system */ + + else return pc; /* no adjustment will be made */ +} + +/* To skip prologues, I use this predicate. Returns either PC itself + if the code at PC does not look like a function prologue; otherwise + returns an address that (if we're lucky) follows the prologue. If + LENIENT, then we must skip everything which is involved in setting + up the frame (it's OK to skip more, just so long as we don't skip + anything which might clobber the registers which are being saved. + Currently we must not skip more on the alpha, but we might the lenient + stuff some day. */ + +CORE_ADDR +skip_prologue (pc) + CORE_ADDR pc; +{ + unsigned long inst; + int offset; + CORE_ADDR post_prologue_pc; + char buf[4]; + +#ifdef GDB_TARGET_HAS_SHARED_LIBS + /* Silently return the unaltered pc upon memory errors. + This could happen on OSF/1 if decode_line_1 tries to skip the + prologue for quickstarted shared library functions when the + shared library is not yet mapped in. + Reading target memory is slow over serial lines, so we perform + this check only if the target has shared libraries. */ + if (target_read_memory (pc, buf, 4)) + return pc; +#endif + + /* See if we can determine the end of the prologue via the symbol table. + If so, then return either PC, or the PC after the prologue, whichever + is greater. */ + + post_prologue_pc = after_prologue (pc); + + if (post_prologue_pc != 0) + return max (pc, post_prologue_pc); + + + /* Can't determine prologue from the symbol table, (this can happen if there + is no debug information) so we need to fall back on the old code, which + looks at the instructions */ + /* FIXME (elz) !!!!: this may create a problem if, once the bp is hit, the user says + where: the backtrace info is not right: this is because the point at which we + break is at the very first instruction of the function. At this time the stuff that + needs to be saved on the stack, has not been saved yet, so the backtrace + cannot know all it needs to know. This will need to be fixed in the + actual backtrace code. (Note: this is what DDE does) */ + + else + + return (skip_prologue_hard_way(pc)); + +#if 0 +/* elz: I am keeping this code around just in case, but remember, all the + instructions are for alpha: you should change all to the hppa instructions */ + + /* Can't determine prologue from the symbol table, need to examine + instructions. */ + + /* Skip the typical prologue instructions. These are the stack adjustment + instruction and the instructions that save registers on the stack + or in the gcc frame. */ + for (offset = 0; offset < 100; offset += 4) + { + int status; + + status = read_memory_nobpt (pc + offset, buf, 4); + if (status) + memory_error (status, pc + offset); + inst = extract_unsigned_integer (buf, 4); + + /* The alpha has no delay slots. But let's keep the lenient stuff, + we might need it for something else in the future. */ + if (lenient && 0) + continue; + + if ((inst & 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */ + continue; + if ((inst & 0xffff0000) == 0x23bd0000) /* lda $gp,n($gp) */ + continue; + if ((inst & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */ + continue; + else if ((inst & 0xfc1f0000) == 0xb41e0000 + && (inst & 0xffff0000) != 0xb7fe0000) + continue; /* stq reg,n($sp) */ + /* reg != $zero */ + else if ((inst & 0xfc1f0000) == 0x9c1e0000 + && (inst & 0xffff0000) != 0x9ffe0000) + continue; /* stt reg,n($sp) */ + /* reg != $zero */ + else if (inst == 0x47de040f) /* bis sp,sp,fp */ + continue; + else + break; + } + return pc + offset; +#endif /* 0 */ +} + /* Put here the code to store, into a struct frame_saved_regs, the addresses of the saved registers of frame described by FRAME_INFO. This includes special registers such as pc and fp saved in special @@ -2795,6 +3795,480 @@ hppa_frame_find_saved_regs (frame_info, frame_saved_regs) } } + +/* Exception handling support for the HP-UX ANSI C++ compiler. + The compiler (aCC) provides a callback for exception events; + GDB can set a breakpoint on this callback and find out what + exception event has occurred. */ + +/* The name of the hook to be set to point to the callback function */ +static char HP_ACC_EH_notify_hook[] = "__eh_notify_hook"; +/* The name of the function to be used to set the hook value */ +static char HP_ACC_EH_set_hook_value[] = "__eh_set_hook_value"; +/* The name of the callback function in end.o */ +static char HP_ACC_EH_notify_callback[] = "__d_eh_notify_callback"; +/* Name of function in end.o on which a break is set (called by above) */ +static char HP_ACC_EH_break[] = "__d_eh_break"; +/* Name of flag (in end.o) that enables catching throws */ +static char HP_ACC_EH_catch_throw[] = "__d_eh_catch_throw"; +/* Name of flag (in end.o) that enables catching catching */ +static char HP_ACC_EH_catch_catch[] = "__d_eh_catch_catch"; +/* The enum used by aCC */ +typedef enum { + __EH_NOTIFY_THROW, + __EH_NOTIFY_CATCH +} __eh_notification; + +/* Is exception-handling support available with this executable? */ +static int hp_cxx_exception_support = 0; +/* Has the initialize function been run? */ +int hp_cxx_exception_support_initialized = 0; +/* Similar to above, but imported from breakpoint.c -- non-target-specific */ +extern int exception_support_initialized; +/* Address of __eh_notify_hook */ +static CORE_ADDR eh_notify_hook_addr = NULL; +/* Address of __d_eh_notify_callback */ +static CORE_ADDR eh_notify_callback_addr = NULL; +/* Address of __d_eh_break */ +static CORE_ADDR eh_break_addr = NULL; +/* Address of __d_eh_catch_catch */ +static CORE_ADDR eh_catch_catch_addr = NULL; +/* Address of __d_eh_catch_throw */ +static CORE_ADDR eh_catch_throw_addr = NULL; +/* Sal for __d_eh_break */ +static struct symtab_and_line * break_callback_sal = NULL; + +/* Code in end.c expects __d_pid to be set in the inferior, + otherwise __d_eh_notify_callback doesn't bother to call + __d_eh_break! So we poke the pid into this symbol + ourselves. + 0 => success + 1 => failure */ +int +setup_d_pid_in_inferior () +{ + CORE_ADDR anaddr; + struct minimal_symbol * msymbol; + char buf[4]; /* FIXME 32x64? */ + + /* Slam the pid of the process into __d_pid; failing is only a warning! */ + msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); + if (msymbol == NULL) + { + warning ("Unable to find __d_pid symbol in object file."); + warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); + return 1; + } + + anaddr = SYMBOL_VALUE_ADDRESS (msymbol); + store_unsigned_integer (buf, 4, inferior_pid); /* FIXME 32x64? */ + if (target_write_memory (anaddr, buf, 4)) /* FIXME 32x64? */ + { + warning ("Unable to write __d_pid"); + warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); + return 1; + } + return 0; +} + +/* Initialize exception catchpoint support by looking for the + necessary hooks/callbacks in end.o, etc., and set the hook value to + point to the required debug function + + Return 0 => failure + 1 => success */ + +static int +initialize_hp_cxx_exception_support () +{ + struct symtabs_and_lines sals; + struct cleanup * old_chain; + struct cleanup * canonical_strings_chain = NULL; + int i; + char * addr_start; + char * addr_end = NULL; + char ** canonical = (char **) NULL; + int thread = -1; + struct symbol * sym = NULL; + struct minimal_symbol * msym = NULL; + struct objfile * objfile; + asection *shlib_info; + + /* Detect and disallow recursion. On HP-UX with aCC, infinite + recursion is a possibility because finding the hook for exception + callbacks involves making a call in the inferior, which means + re-inserting breakpoints which can re-invoke this code */ + + static int recurse = 0; + if (recurse > 0) + { + hp_cxx_exception_support_initialized = 0; + exception_support_initialized = 0; + return 0; + } + + hp_cxx_exception_support = 0; + + /* First check if we have seen any HP compiled objects; if not, + it is very unlikely that HP's idiosyncratic callback mechanism + for exception handling debug support will be available! + This will percolate back up to breakpoint.c, where our callers + will decide to try the g++ exception-handling support instead. */ + if (!hp_som_som_object_present) + return 0; + + /* We have a SOM executable with SOM debug info; find the hooks */ + + /* First look for the notify hook provided by aCC runtime libs */ + /* If we find this symbol, we conclude that the executable must + have HP aCC exception support built in. If this symbol is not + found, even though we're a HP SOM-SOM file, we may have been + built with some other compiler (not aCC). This results percolates + back up to our callers in breakpoint.c which can decide to + try the g++ style of exception support instead. + If this symbol is found but the other symbols we require are + not found, there is something weird going on, and g++ support + should *not* be tried as an alternative. + + ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined. + ASSUMPTION: HP aCC and g++ modules cannot be linked together. */ + + /* libCsup has this hook; it'll usually be non-debuggable */ + msym = lookup_minimal_symbol (HP_ACC_EH_notify_hook, NULL, NULL); + if (msym) + { + eh_notify_hook_addr = SYMBOL_VALUE_ADDRESS (msym); + hp_cxx_exception_support = 1; + } + else + { + warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook); + warning ("Executable may not have been compiled debuggable with HP aCC."); + warning ("GDB will be unable to intercept exception events."); + eh_notify_hook_addr = 0; + hp_cxx_exception_support = 0; + return 0; + } + +#if 0 /* DEBUGGING */ + printf ("Hook addr found is %lx\n", eh_notify_hook_addr); +#endif + + /* Next look for the notify callback routine in end.o */ + /* This is always available in the SOM symbol dictionary if end.o is linked in */ + msym = lookup_minimal_symbol (HP_ACC_EH_notify_callback, NULL, NULL); + if (msym) + { + eh_notify_callback_addr = SYMBOL_VALUE_ADDRESS (msym); + hp_cxx_exception_support = 1; + } + else + { + warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback); + warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); + warning ("GDB will be unable to intercept exception events."); + eh_notify_callback_addr = 0; + return 0; + } + + /* Check whether the executable is dynamically linked or archive bound */ + /* With an archive-bound executable we can use the raw addresses we find + for the callback function, etc. without modification. For an executable + with shared libraries, we have to do more work to find the plabel, which + can be the target of a call through $$dyncall from the aCC runtime support + library (libCsup) which is linked shared by default by aCC. */ + /* This test below was copied from somsolib.c/somread.c. It may not be a very + reliable one to test that an executable is linked shared. pai/1997-07-18 */ + shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); + if (shlib_info && (bfd_section_size (symfile_objfile->obfd, shlib_info) != 0)) + { + /* The minsym we have has the local code address, but that's not the + plabel that can be used by an inter-load-module call. */ + /* Find solib handle for main image (which has end.o), and use that + and the min sym as arguments to __d_shl_get() (which does the equivalent + of shl_findsym()) to find the plabel. */ + + args_for_find_stub args; + static char message[] = "Error while finding exception callback hook:\n"; + + args.solib_handle = som_solib_get_solib_by_pc (eh_notify_callback_addr); + args.msym = msym; + + recurse++; + eh_notify_callback_addr = catch_errors ((int (*) PARAMS ((char *))) cover_find_stub_with_shl_get, + (char *) &args, + message, RETURN_MASK_ALL); + recurse--; + +#if 0 /* DEBUGGING */ + printf ("found plabel for eh notify callback: %x\n", eh_notify_callback_addr); +#endif + + exception_catchpoints_are_fragile = 1; + + if (!eh_notify_callback_addr) + { + /* We can get here either if there is no plabel in the export list + for the main image, or if something strange happened (??) */ + warning ("Couldn't find a plabel (indirect function label) for the exception callback."); + warning ("GDB will not be able to intercept exception events."); + return 0; + } + } + else + exception_catchpoints_are_fragile = 0; + +#if 0 /* DEBUGGING */ + printf ("Cb addr found is %lx\n", eh_notify_callback_addr); +#endif + + /* Now, look for the breakpointable routine in end.o */ + /* This should also be available in the SOM symbol dict. if end.o linked in */ + msym = lookup_minimal_symbol (HP_ACC_EH_break, NULL, NULL); + if (msym) + { + eh_break_addr = SYMBOL_VALUE_ADDRESS (msym); + hp_cxx_exception_support = 1; + } + else + { + warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break); + warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); + warning ("GDB will be unable to intercept exception events."); + eh_break_addr = 0; + return 0; + } + +#if 0 /* DEBUGGING */ + printf ("break addr found is %lx\n", eh_break_addr); +#endif + + /* Next look for the catch enable flag provided in end.o */ + sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, + VAR_NAMESPACE, 0, (struct symtab **) NULL); + if (sym) /* sometimes present in debug info */ + { + eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (sym); + hp_cxx_exception_support = 1; + } + else /* otherwise look in SOM symbol dict. */ + { + msym = lookup_minimal_symbol (HP_ACC_EH_catch_catch, NULL, NULL); + if (msym) + { + eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (msym); + hp_cxx_exception_support = 1; + } + else + { + warning ("Unable to enable interception of exception catches."); + warning ("Executable may not have been compiled debuggable with HP aCC."); + warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); + return 0; + } + } + +#if 0 /* DEBUGGING */ + printf ("catch catch addr found is %lx\n", eh_catch_catch_addr); +#endif + + /* Next look for the catch enable flag provided end.o */ + sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, + VAR_NAMESPACE, 0, (struct symtab **) NULL); + if (sym) /* sometimes present in debug info */ + { + eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (sym); + hp_cxx_exception_support = 1; + } + else /* otherwise look in SOM symbol dict. */ + { + msym = lookup_minimal_symbol (HP_ACC_EH_catch_throw, NULL, NULL); + if (msym) + { + eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (msym); + hp_cxx_exception_support = 1; + } + else + { + warning ("Unable to enable interception of exception throws."); + warning ("Executable may not have been compiled debuggable with HP aCC."); + warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); + return 0; + } + } + +#if 0 /* DEBUGGING */ + printf ("catch throw addr found is %lx\n", eh_catch_throw_addr); +#endif + + /* Set the flags */ + hp_cxx_exception_support = 2; /* everything worked so far */ + hp_cxx_exception_support_initialized = 1; + exception_support_initialized = 1; + + return 1; +} + +/* Target operation for enabling or disabling interception of + exception events. + KIND is either EX_EVENT_THROW or EX_EVENT_CATCH + ENABLE is either 0 (disable) or 1 (enable). + Return value is NULL if no support found; + -1 if something went wrong, + or a pointer to a symtab/line struct if the breakpointable + address was found. */ + +struct symtab_and_line * +child_enable_exception_callback (kind, enable) + enum exception_event_kind kind; + int enable; +{ + char buf[4]; + + if (!exception_support_initialized || !hp_cxx_exception_support_initialized) + if (!initialize_hp_cxx_exception_support ()) + return NULL; + + switch (hp_cxx_exception_support) + { + case 0: + /* Assuming no HP support at all */ + return NULL; + case 1: + /* HP support should be present, but something went wrong */ + return (struct symtab_and_line *) -1; /* yuck! */ + /* there may be other cases in the future */ + } + + /* Set the EH hook to point to the callback routine */ + store_unsigned_integer (buf, 4, enable ? eh_notify_callback_addr : 0); /* FIXME 32x64 problem */ + /* pai: (temp) FIXME should there be a pack operation first? */ + if (target_write_memory (eh_notify_hook_addr, buf, 4)) /* FIXME 32x64 problem */ + { + warning ("Could not write to target memory for exception event callback."); + warning ("Interception of exception events may not work."); + return (struct symtab_and_line *) -1; + } + if (enable) + { + /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-(*/ + if (inferior_pid > 0) + { + if (setup_d_pid_in_inferior ()) + return (struct symtab_and_line *) -1; + } + else + { + warning ("Internal error: Invalid inferior pid? Cannot intercept exception events."); /* purecov: deadcode */ + return (struct symtab_and_line *) -1; /* purecov: deadcode */ + } + } + + switch (kind) + { + case EX_EVENT_THROW: + store_unsigned_integer (buf, 4, enable ? 1 : 0); + if (target_write_memory (eh_catch_throw_addr, buf, 4)) /* FIXME 32x64? */ + { + warning ("Couldn't enable exception throw interception."); + return (struct symtab_and_line *) -1; + } + break; + case EX_EVENT_CATCH: + store_unsigned_integer (buf, 4, enable ? 1 : 0); + if (target_write_memory (eh_catch_catch_addr, buf, 4)) /* FIXME 32x64? */ + { + warning ("Couldn't enable exception catch interception."); + return (struct symtab_and_line *) -1; + } + break; + default: /* purecov: deadcode */ + error ("Request to enable unknown or unsupported exception event."); /* purecov: deadcode */ + } + + /* Copy break address into new sal struct, malloc'ing if needed. */ + if (!break_callback_sal) + { + break_callback_sal = (struct symtab_and_line *) xmalloc (sizeof (struct symtab_and_line)); + } + INIT_SAL(break_callback_sal); + break_callback_sal->symtab = NULL; + break_callback_sal->pc = eh_break_addr; + break_callback_sal->line = 0; + break_callback_sal->end = eh_break_addr; + + return break_callback_sal; +} + +/* Record some information about the current exception event */ +static struct exception_event_record current_ex_event; +/* Convenience struct */ +static struct symtab_and_line null_symtab_and_line = { NULL, 0, 0, 0 }; + +/* Report current exception event. Returns a pointer to a record + that describes the kind of the event, where it was thrown from, + and where it will be caught. More information may be reported + in the future */ +struct exception_event_record * +child_get_current_exception_event () +{ + CORE_ADDR event_kind; + CORE_ADDR throw_addr; + CORE_ADDR catch_addr; + struct frame_info *fi, *curr_frame; + int level = 1; + + curr_frame = get_current_frame(); + if (!curr_frame) + return (struct exception_event_record *) NULL; + + /* Go up one frame to __d_eh_notify_callback, because at the + point when this code is executed, there's garbage in the + arguments of __d_eh_break. */ + fi = find_relative_frame (curr_frame, &level); + if (level != 0) + return (struct exception_event_record *) NULL; + + select_frame (fi, -1); + + /* Read in the arguments */ + /* __d_eh_notify_callback() is called with 3 arguments: + 1. event kind catch or throw + 2. the target address if known + 3. a flag -- not sure what this is. pai/1997-07-17 */ + event_kind = read_register (ARG0_REGNUM); + catch_addr = read_register (ARG1_REGNUM); + + /* Now go down to a user frame */ + /* For a throw, __d_eh_break is called by + __d_eh_notify_callback which is called by + __notify_throw which is called + from user code. + For a catch, __d_eh_break is called by + __d_eh_notify_callback which is called by + <stackwalking stuff> which is called by + __throw__<stuff> or __rethrow_<stuff> which is called + from user code. */ + /* FIXME: Don't use such magic numbers; search for the frames */ + level = (event_kind == EX_EVENT_THROW) ? 3 : 4; + fi = find_relative_frame (curr_frame, &level); + if (level != 0) + return (struct exception_event_record *) NULL; + + select_frame (fi, -1); + throw_addr = fi->pc; + + /* Go back to original (top) frame */ + select_frame (curr_frame, -1); + + current_ex_event.kind = (enum exception_event_kind) event_kind; + current_ex_event.throw_sal = find_pc_line (throw_addr, 1); + current_ex_event.catch_sal = find_pc_line (catch_addr, 1); + + return ¤t_ex_event; +} + + #ifdef MAINTENANCE_CMDS static void @@ -2870,6 +4344,86 @@ unwind_command (exp, from_tty) } #endif /* MAINTENANCE_CMDS */ +#ifdef PREPARE_TO_PROCEED + +/* If the user has switched threads, and there is a breakpoint + at the old thread's pc location, then switch to that thread + and return TRUE, else return FALSE and don't do a thread + switch (or rather, don't seem to have done a thread switch). + + Ptrace-based gdb will always return FALSE to the thread-switch + query, and thus also to PREPARE_TO_PROCEED. + + The important thing is whether there is a BPT instruction, + not how many user breakpoints there are. So we have to worry + about things like these: + + o Non-bp stop -- NO + + o User hits bp, no switch -- NO + + o User hits bp, switches threads -- YES + + o User hits bp, deletes bp, switches threads -- NO + + o User hits bp, deletes one of two or more bps + at that PC, user switches threads -- YES + + o Plus, since we're buffering events, the user may have hit a + breakpoint, deleted the breakpoint and then gotten another + hit on that same breakpoint on another thread which + actually hit before the delete. (FIXME in breakpoint.c + so that "dead" breakpoints are ignored?) -- NO + + For these reasons, we have to violate information hiding and + call "breakpoint_here_p". If core gdb thinks there is a bpt + here, that's what counts, as core gdb is the one which is + putting the BPT instruction in and taking it out. */ +int +hppa_prepare_to_proceed() +{ + pid_t old_thread; + pid_t current_thread; + + old_thread = hppa_switched_threads(inferior_pid); + if (old_thread != 0) + { + /* Switched over from "old_thread". Try to do + as little work as possible, 'cause mostly + we're going to switch back. */ + CORE_ADDR new_pc; + CORE_ADDR old_pc = read_pc(); + + /* Yuk, shouldn't use global to specify current + thread. But that's how gdb does it. */ + current_thread = inferior_pid; + inferior_pid = old_thread; + + new_pc = read_pc(); + if (new_pc != old_pc /* If at same pc, no need */ + && breakpoint_here_p (new_pc)) + { + /* User hasn't deleted the BP. + Return TRUE, finishing switch to "old_thread". */ + flush_cached_frames (); + registers_changed (); +#if 0 + printf("---> PREPARE_TO_PROCEED (was %d, now %d)!\n", + current_thread, inferior_pid); +#endif + + return 1; + } + + /* Otherwise switch back to the user-chosen thread. */ + inferior_pid = current_thread; + new_pc = read_pc(); /* Re-prime register cache */ + } + + return 0; +} +#endif /* PREPARE_TO_PROCEED */ + void _initialize_hppa_tdep () { |