/* Machine-dependent code which would otherwise be in inflow.c and core.c, for GDB, the GNU debugger. This code is for the HP PA-RISC cpu. Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc. Contributed by the Center for Software Science at the University of Utah (pa-gdb-bugs@cs.utah.edu). This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "defs.h" #include "frame.h" #include "inferior.h" #include "value.h" /* For argument passing to the inferior */ #include "symtab.h" #ifdef USG #include #endif #include #include #include #include #ifdef COFF_ENCAPSULATE #include "a.out.encap.h" #else #include #endif #ifndef N_SET_MAGIC #define N_SET_MAGIC(exec, val) ((exec).a_magic = (val)) #endif /*#include After a.out.h */ #include #include #include #include "wait.h" #include "gdbcore.h" #include "gdbcmd.h" #include "target.h" #include "symfile.h" #include "objfiles.h" static int restore_pc_queue PARAMS ((struct frame_saved_regs *fsr)); static int hppa_alignof PARAMS ((struct type *arg)); CORE_ADDR frame_saved_pc PARAMS ((FRAME frame)); /* Routines to extract various sized constants out of hppa instructions. */ /* This assumes that no garbage lies outside of the lower bits of value. */ int sign_extend (val, bits) unsigned val, bits; { return (int)(val >> bits - 1 ? (-1 << bits) | val : val); } /* For many immediate values the sign bit is the low bit! */ int low_sign_extend (val, bits) unsigned val, bits; { return (int)((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1); } /* extract the immediate field from a ld{bhw}s instruction */ unsigned get_field (val, from, to) unsigned val, from, to; { val = val >> 31 - to; return val & ((1 << 32 - from) - 1); } unsigned set_field (val, from, to, new_val) unsigned *val, from, to; { unsigned mask = ~((1 << (to - from + 1)) << (31 - from)); return *val = *val & mask | (new_val << (31 - from)); } /* extract a 3-bit space register number from a be, ble, mtsp or mfsp */ extract_3 (word) unsigned word; { return GET_FIELD (word, 18, 18) << 2 | GET_FIELD (word, 16, 17); } extract_5_load (word) unsigned word; { return low_sign_extend (word >> 16 & MASK_5, 5); } /* extract the immediate field from a st{bhw}s instruction */ int extract_5_store (word) unsigned word; { return low_sign_extend (word & MASK_5, 5); } /* extract the immediate field from a break instruction */ unsigned extract_5r_store (word) unsigned word; { return (word & MASK_5); } /* extract the immediate field from a {sr}sm instruction */ unsigned extract_5R_store (word) unsigned word; { return (word >> 16 & MASK_5); } /* extract an 11 bit immediate field */ int extract_11 (word) unsigned word; { return low_sign_extend (word & MASK_11, 11); } /* extract a 14 bit immediate field */ int extract_14 (word) unsigned word; { return low_sign_extend (word & MASK_14, 14); } /* deposit a 14 bit constant in a word */ unsigned deposit_14 (opnd, word) int opnd; unsigned word; { unsigned sign = (opnd < 0 ? 1 : 0); return word | ((unsigned)opnd << 1 & MASK_14) | sign; } /* extract a 21 bit constant */ int extract_21 (word) unsigned word; { int val; word &= MASK_21; word <<= 11; val = GET_FIELD (word, 20, 20); val <<= 11; val |= GET_FIELD (word, 9, 19); val <<= 2; val |= GET_FIELD (word, 5, 6); val <<= 5; val |= GET_FIELD (word, 0, 4); val <<= 2; val |= GET_FIELD (word, 7, 8); return sign_extend (val, 21) << 11; } /* deposit a 21 bit constant in a word. Although 21 bit constants are usually the top 21 bits of a 32 bit constant, we assume that only the low 21 bits of opnd are relevant */ unsigned deposit_21 (opnd, word) unsigned opnd, word; { unsigned val = 0; val |= GET_FIELD (opnd, 11 + 14, 11 + 18); val <<= 2; val |= GET_FIELD (opnd, 11 + 12, 11 + 13); val <<= 2; val |= GET_FIELD (opnd, 11 + 19, 11 + 20); val <<= 11; val |= GET_FIELD (opnd, 11 + 1, 11 + 11); val <<= 1; val |= GET_FIELD (opnd, 11 + 0, 11 + 0); return word | val; } /* extract a 12 bit constant from branch instructions */ int extract_12 (word) unsigned word; { return sign_extend (GET_FIELD (word, 19, 28) | GET_FIELD (word, 29, 29) << 10 | (word & 0x1) << 11, 12) << 2; } /* extract a 17 bit constant from branch instructions, returning the 19 bit signed value. */ int extract_17 (word) unsigned word; { return sign_extend (GET_FIELD (word, 19, 28) | GET_FIELD (word, 29, 29) << 10 | GET_FIELD (word, 11, 15) << 11 | (word & 0x1) << 16, 17) << 2; } static int use_unwind = 0; /* Lookup the unwind (stack backtrace) info for the given PC. We search all of the objfiles seeking the unwind table entry for this PC. Each objfile contains a sorted list of struct unwind_table_entry. Since we do a binary search of the unwind tables, we depend upon them to be sorted. */ static struct unwind_table_entry * find_unwind_entry(pc) CORE_ADDR pc; { int first, middle, last; struct objfile *objfile; ALL_OBJFILES (objfile) { struct obj_unwind_info *ui; ui = OBJ_UNWIND_INFO (objfile); if (!ui) continue; /* First, check the cache */ if (ui->cache && pc >= ui->cache->region_start && pc <= ui->cache->region_end) return ui->cache; /* Not in the cache, do a binary search */ first = 0; last = ui->last; while (first <= last) { middle = (first + last) / 2; if (pc >= ui->table[middle].region_start && pc <= ui->table[middle].region_end) { ui->cache = &ui->table[middle]; return &ui->table[middle]; } if (pc < ui->table[middle].region_start) last = middle - 1; else first = middle + 1; } } /* ALL_OBJFILES() */ return NULL; } static int find_return_regnum(pc) CORE_ADDR pc; { struct unwind_table_entry *u; u = find_unwind_entry (pc); if (!u) return RP_REGNUM; if (u->Millicode) return 31; return RP_REGNUM; } int find_proc_framesize(pc) CORE_ADDR pc; { struct unwind_table_entry *u; if (!use_unwind) return -1; u = find_unwind_entry (pc); if (!u) return -1; if (u->Save_SP) /* If this bit is set, it means there is a frame pointer and we should use it. */ return -1; return u->Total_frame_size << 3; } int rp_saved(pc) { struct unwind_table_entry *u; u = find_unwind_entry (pc); if (!u) return 0; if (u->Save_RP) return 1; else return 0; } int frameless_function_invocation (frame) FRAME frame; { if (use_unwind) { struct unwind_table_entry *u; u = find_unwind_entry (frame->pc); if (u == 0) return 0; return (u->Total_frame_size == 0); } else return frameless_look_for_prologue (frame); } CORE_ADDR saved_pc_after_call (frame) FRAME frame; { int ret_regnum; ret_regnum = find_return_regnum (get_frame_pc (frame)); return read_register (ret_regnum) & ~0x3; } CORE_ADDR frame_saved_pc (frame) FRAME frame; { CORE_ADDR pc = get_frame_pc (frame); if (frameless_function_invocation (frame)) { int ret_regnum; ret_regnum = find_return_regnum (pc); return read_register (ret_regnum) & ~0x3; } else if (rp_saved (pc)) return read_memory_integer (frame->frame - 20, 4) & ~0x3; else return read_register (RP_REGNUM) & ~0x3; } /* We need to correct the PC and the FP for the outermost frame when we are in a system call. */ void init_extra_frame_info (fromleaf, frame) int fromleaf; struct frame_info *frame; { int flags; int framesize; if (frame->next) /* Only do this for outermost frame */ return; flags = read_register (FLAGS_REGNUM); if (flags & 2) /* In system call? */ frame->pc = read_register (31) & ~0x3; /* The outermost frame is always derived from PC-framesize */ framesize = find_proc_framesize(frame->pc); if (framesize == -1) frame->frame = read_register (FP_REGNUM); else frame->frame = read_register (SP_REGNUM) - framesize; if (!frameless_function_invocation (frame)) /* Frameless? */ return; /* No, quit now */ /* For frameless functions, we need to look at the caller's frame */ framesize = find_proc_framesize(FRAME_SAVED_PC(frame)); if (framesize != -1) frame->frame -= framesize; } FRAME_ADDR frame_chain (frame) struct frame_info *frame; { int framesize; framesize = find_proc_framesize(FRAME_SAVED_PC(frame)); if (framesize != -1) return frame->frame - framesize; return read_memory_integer (frame->frame, 4); } /* To see if a frame chain is valid, see if the caller looks like it was compiled with gcc. */ int frame_chain_valid (chain, thisframe) FRAME_ADDR chain; FRAME thisframe; { struct minimal_symbol *msym; if (!chain) return 0; if (use_unwind) { struct unwind_table_entry *u; u = find_unwind_entry (thisframe->pc); if (u && (u->Save_SP || u->Total_frame_size)) return 1; else return 0; } else { msym = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe)); if (msym && (strcmp (SYMBOL_NAME (msym), "_start") == 0)) return 0; else return 1; } } /* * 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. */ int push_dummy_frame () { register CORE_ADDR sp; register int regnum; int int_buffer; double freg_buffer; /* Space for "arguments"; the RP goes in here. */ sp = read_register (SP_REGNUM) + 48; int_buffer = read_register (RP_REGNUM) | 0x3; write_memory (sp - 20, (char *)&int_buffer, 4); int_buffer = read_register (FP_REGNUM); write_memory (sp, (char *)&int_buffer, 4); write_register (FP_REGNUM, sp); sp += 8; for (regnum = 1; regnum < 32; regnum++) if (regnum != RP_REGNUM && regnum != FP_REGNUM) sp = push_word (sp, read_register (regnum)); sp += 4; for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++) { read_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8); sp = push_bytes (sp, (char *)&freg_buffer, 8); } sp = push_word (sp, read_register (IPSW_REGNUM)); sp = push_word (sp, read_register (SAR_REGNUM)); sp = push_word (sp, read_register (PCOQ_HEAD_REGNUM)); sp = push_word (sp, read_register (PCSQ_HEAD_REGNUM)); sp = push_word (sp, read_register (PCOQ_TAIL_REGNUM)); sp = push_word (sp, read_register (PCSQ_TAIL_REGNUM)); write_register (SP_REGNUM, sp); } find_dummy_frame_regs (frame, frame_saved_regs) struct frame_info *frame; struct frame_saved_regs *frame_saved_regs; { CORE_ADDR fp = frame->frame; int i; frame_saved_regs->regs[RP_REGNUM] = fp - 20 & ~0x3; frame_saved_regs->regs[FP_REGNUM] = fp; frame_saved_regs->regs[1] = fp + 8; for (fp += 12, i = 3; i < 32; i++) { if (i != FP_REGNUM) { frame_saved_regs->regs[i] = fp; fp += 4; } } fp += 4; for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8) frame_saved_regs->regs[i] = fp; frame_saved_regs->regs[IPSW_REGNUM] = fp; frame_saved_regs->regs[SAR_REGNUM] = fp + 4; frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp + 8; frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp + 12; frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp + 16; frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp + 20; } int hppa_pop_frame () { register FRAME frame = get_current_frame (); register CORE_ADDR fp; register int regnum; struct frame_saved_regs fsr; struct frame_info *fi; double freg_buffer; fi = get_frame_info (frame); fp = fi->frame; get_frame_saved_regs (fi, &fsr); if (fsr.regs[IPSW_REGNUM]) /* Restoring a call dummy frame */ restore_pc_queue (&fsr); for (regnum = 31; regnum > 0; regnum--) if (fsr.regs[regnum]) write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM ; regnum--) if (fsr.regs[regnum]) { read_memory (fsr.regs[regnum], (char *)&freg_buffer, 8); write_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8); } if (fsr.regs[IPSW_REGNUM]) write_register (IPSW_REGNUM, read_memory_integer (fsr.regs[IPSW_REGNUM], 4)); if (fsr.regs[SAR_REGNUM]) write_register (SAR_REGNUM, read_memory_integer (fsr.regs[SAR_REGNUM], 4)); if (fsr.regs[PCOQ_TAIL_REGNUM]) write_register (PCOQ_TAIL_REGNUM, read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], 4)); write_register (FP_REGNUM, read_memory_integer (fp, 4)); if (fsr.regs[IPSW_REGNUM]) /* call dummy */ write_register (SP_REGNUM, fp - 48); else write_register (SP_REGNUM, fp); flush_cached_frames (); set_current_frame (create_new_frame (read_register (FP_REGNUM), read_pc ())); } /* * After returning to a dummy on the stack, restore the instruction * queue space registers. */ static int restore_pc_queue (fsr) struct frame_saved_regs *fsr; { CORE_ADDR pc = read_pc (); CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM], 4); int pid; WAITTYPE w; int insn_count; /* Advance past break instruction in the call dummy. */ 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. */ write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM], 4)); write_register (22, new_pc); for (insn_count = 0; insn_count < 3; insn_count++) { resume (1, 0); target_wait(&w); if (!WIFSTOPPED (w)) { stop_signal = WTERMSIG (w); terminal_ours_for_output (); printf ("\nProgram terminated with signal %d, %s\n", stop_signal, safe_strsignal (stop_signal)); fflush (stdout); return 0; } } fetch_inferior_registers (-1); return 1; } CORE_ADDR hppa_push_arguments (nargs, args, sp, struct_return, struct_addr) int nargs; value *args; CORE_ADDR sp; int struct_return; CORE_ADDR struct_addr; { /* array of arguments' offsets */ int *offset = (int *)alloca(nargs * sizeof (int)); int cum = 0; int i, alignment; for (i = 0; i < nargs; i++) { /* Coerce chars to int & float to double if necessary */ args[i] = value_arg_coerce (args[i]); cum += TYPE_LENGTH (VALUE_TYPE (args[i])); /* value must go at proper alignment. Assume alignment is a 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); for (i = 0; i < nargs; i++) write_memory (sp + offset[i], VALUE_CONTENTS (args[i]), TYPE_LENGTH (VALUE_TYPE (args[i]))); if (struct_return) write_register (28, struct_addr); return sp + 32; } /* * 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 $$dyncall. * Therefore our version of FIX_CALL_DUMMY takes an extra argument, * real_pc, which is the location where gdb should start up the * inferior to do the function call. */ CORE_ADDR hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) REGISTER_TYPE *dummy; CORE_ADDR pc; CORE_ADDR fun; int nargs; value *args; struct type *type; int gcc_p; { CORE_ADDR dyncall_addr, sr4export_addr; struct minimal_symbol *msymbol; msymbol = lookup_minimal_symbol ("$$dyncall", (struct objfile *) NULL); if (msymbol == NULL) error ("Can't find an address for $$dyncall trampoline"); dyncall_addr = SYMBOL_VALUE_ADDRESS (msymbol); msymbol = lookup_minimal_symbol ("_sr4export", (struct objfile *) NULL); if (msymbol == NULL) error ("Can't find an address for _sr4export trampoline"); sr4export_addr = SYMBOL_VALUE_ADDRESS (msymbol); dummy[9] = deposit_21 (fun >> 11, dummy[9]); dummy[10] = deposit_14 (fun & MASK_11, dummy[10]); dummy[12] = deposit_21 (sr4export_addr >> 11, dummy[12]); dummy[13] = deposit_14 (sr4export_addr & MASK_11, dummy[13]); write_register (22, pc); return dyncall_addr; } /* return the alignment of a type in bytes. Structures have the maximum alignment required by their fields. */ static int hppa_alignof (arg) struct type *arg; { int max_align, align, i; switch (TYPE_CODE (arg)) { case TYPE_CODE_PTR: case TYPE_CODE_INT: case TYPE_CODE_FLT: return TYPE_LENGTH (arg); case TYPE_CODE_ARRAY: return hppa_alignof (TYPE_FIELD_TYPE (arg, 0)); case TYPE_CODE_STRUCT: case TYPE_CODE_UNION: max_align = 2; for (i = 0; i < TYPE_NFIELDS (arg); i++) { /* Bit fields have no real alignment. */ if (!TYPE_FIELD_BITPOS (arg, i)) { align = hppa_alignof (TYPE_FIELD_TYPE (arg, i)); max_align = max (max_align, align); } } return max_align; default: return 4; } } /* Print the register regnum, or all registers if regnum is -1 */ pa_do_registers_info (regnum, fpregs) int regnum; int fpregs; { char raw_regs [REGISTER_BYTES]; int i; 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 ("%s %x\n", reg_names[regnum], *(long *)(raw_regs + REGISTER_BYTE (regnum))); else pa_print_fp_reg (regnum); } pa_print_registers (raw_regs, regnum, fpregs) char *raw_regs; int regnum; int fpregs; { int i; for (i = 0; i < 18; i++) printf ("%8.8s: %8x %8.8s: %8x %8.8s: %8x %8.8s: %8x\n", reg_names[i], *(int *)(raw_regs + REGISTER_BYTE (i)), reg_names[i + 18], *(int *)(raw_regs + REGISTER_BYTE (i + 18)), reg_names[i + 36], *(int *)(raw_regs + REGISTER_BYTE (i + 36)), reg_names[i + 54], *(int *)(raw_regs + REGISTER_BYTE (i + 54))); if (fpregs) for (i = 72; i < NUM_REGS; i++) pa_print_fp_reg (i); } pa_print_fp_reg (i) int i; { unsigned char raw_buffer[MAX_REGISTER_RAW_SIZE]; unsigned char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; REGISTER_TYPE val; /* Get the data in raw format, then convert also to virtual format. */ read_relative_register_raw_bytes (i, raw_buffer); REGISTER_CONVERT_TO_VIRTUAL (i, raw_buffer, virtual_buffer); fputs_filtered (reg_names[i], stdout); print_spaces_filtered (15 - strlen (reg_names[i]), stdout); val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, stdout, 0, 1, 0, Val_pretty_default); printf_filtered ("\n"); } /* Function calls that pass into a new compilation unit must pass through a small piece of code that does long format (`external' in HPPA parlance) jumps. We figure out where the trampoline is going to end up, and return the PC of the final destination. If we aren't in a trampoline, we just return NULL. For computed calls, we just extract the new PC from r22. */ CORE_ADDR skip_trampoline_code (pc, name) CORE_ADDR pc; char *name; { long inst0, inst1; static CORE_ADDR dyncall = 0; struct minimal_symbol *msym; /* FIXME XXX - dyncall must be initialized whenever we get a new exec file */ if (!dyncall) { msym = lookup_minimal_symbol ("$$dyncall", NULL); if (msym) dyncall = SYMBOL_VALUE_ADDRESS (msym); else dyncall = -1; } if (pc == dyncall) return (CORE_ADDR)(read_register (22) & ~0x3); inst0 = read_memory_integer (pc, 4); inst1 = read_memory_integer (pc+4, 4); if ( (inst0 & 0xffe00000) == 0x20200000 /* ldil xxx, r1 */ && (inst1 & 0xffe0e002) == 0xe0202002) /* be,n yyy(sr4, r1) */ pc = extract_21 (inst0) + extract_17 (inst1); else pc = (CORE_ADDR)NULL; return pc; } /* Advance PC across any function entry prologue instructions to reach some "real" code. */ /* skip (stw rp, -20(0,sp)); copy 4,1; copy sp, 4; stwm 1,framesize(sp) for gcc, or (stw rp, -20(0,sp); stwm 1, framesize(sp) for hcc */ CORE_ADDR skip_prologue(pc) CORE_ADDR pc; { char buf[4]; unsigned long inst; int status; status = target_read_memory (pc, buf, 4); inst = extract_unsigned_integer (buf, 4); if (status != 0) return pc; if (inst == 0x6BC23FD9) /* stw rp,-20(sp) */ { if (read_memory_integer (pc + 4, 4) == 0x8040241) /* copy r4,r1 */ pc += 16; else if ((read_memory_integer (pc + 4, 4) & ~MASK_14) == 0x68810000) /* stw r1,(r4) */ pc += 8; } else if (read_memory_integer (pc, 4) == 0x8040241) /* copy r4,r1 */ pc += 12; else if ((read_memory_integer (pc, 4) & ~MASK_14) == 0x68810000) /* stw r1,(r4) */ pc += 4; return pc; } static void unwind_command (exp, from_tty) char *exp; int from_tty; { CORE_ADDR address; union { int *foo; struct unwind_table_entry *u; } xxx; /* If we have an expression, evaluate it and use it as the address. */ if (exp != 0 && *exp != 0) address = parse_and_eval_address (exp); else return; xxx.u = find_unwind_entry (address); if (!xxx.u) { printf ("Can't find unwind table entry for PC 0x%x\n", address); return; } printf ("%08x\n%08X\n%08X\n%08X\n", xxx.foo[0], xxx.foo[1], xxx.foo[2], xxx.foo[3]); } void _initialize_hppa_tdep () { add_com ("unwind", class_obscure, unwind_command, "Print unwind info\n"); add_show_from_set (add_set_cmd ("use_unwind", class_obscure, var_boolean, (char *)&use_unwind, "Set the usage of unwind info", &setlist), &showlist); }