diff options
Diffstat (limited to 'gdb/vax-tdep.c')
| -rw-r--r-- | gdb/vax-tdep.c | 412 |
1 files changed, 400 insertions, 12 deletions
diff --git a/gdb/vax-tdep.c b/gdb/vax-tdep.c index a5fbe3a..0478227 100644 --- a/gdb/vax-tdep.c +++ b/gdb/vax-tdep.c @@ -1,5 +1,5 @@ /* Print VAX instructions for GDB, the GNU debugger. - Copyright 1986, 1989, 1991, 1992, 1995, 1996, 1998, 1999, 2000 + Copyright 1986, 1989, 1991, 1992, 1995, 1996, 1998, 1999, 2000, 2002 Free Software Foundation, Inc. This file is part of GDB. @@ -23,8 +23,39 @@ #include "symtab.h" #include "opcode/vax.h" #include "gdbcore.h" +#include "inferior.h" +#include "regcache.h" #include "frame.h" #include "value.h" +#include "arch-utils.h" + +#include "vax-tdep.h" + +static gdbarch_register_name_ftype vax_register_name; +static gdbarch_register_byte_ftype vax_register_byte; +static gdbarch_register_raw_size_ftype vax_register_raw_size; +static gdbarch_register_virtual_size_ftype vax_register_virtual_size; +static gdbarch_register_virtual_type_ftype vax_register_virtual_type; + +static gdbarch_skip_prologue_ftype vax_skip_prologue; +static gdbarch_saved_pc_after_call_ftype vax_saved_pc_after_call; +static gdbarch_frame_num_args_ftype vax_frame_num_args; +static gdbarch_frame_chain_ftype vax_frame_chain; +static gdbarch_frame_saved_pc_ftype vax_frame_saved_pc; +static gdbarch_frame_args_address_ftype vax_frame_args_address; +static gdbarch_frame_locals_address_ftype vax_frame_locals_address; +static gdbarch_frame_init_saved_regs_ftype vax_frame_init_saved_regs; +static gdbarch_get_saved_register_ftype vax_get_saved_register; + +static gdbarch_store_struct_return_ftype vax_store_struct_return; +static gdbarch_extract_return_value_ftype vax_extract_return_value; +static gdbarch_store_return_value_ftype vax_store_return_value; +static gdbarch_extract_struct_value_address_ftype + vax_extract_struct_value_address; + +static gdbarch_push_dummy_frame_ftype vax_push_dummy_frame; +static gdbarch_pop_frame_ftype vax_pop_frame; +static gdbarch_fix_call_dummy_ftype vax_fix_call_dummy; /* Return 1 if P points to an invalid floating point value. LEN is the length in bytes -- not relevant on the Vax. */ @@ -52,10 +83,280 @@ static unsigned char *print_insn_arg (); +static char * +vax_register_name (int regno) +{ + static char *register_names[] = + { + "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", + "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", + "ps", + }; + + if (regno < 0) + return (NULL); + if (regno >= (sizeof(register_names) / sizeof(*register_names))) + return (NULL); + return (register_names[regno]); +} + +static int +vax_register_byte (int regno) +{ + return (regno * 4); +} + +static int +vax_register_raw_size (int regno) +{ + return (4); +} + +static int +vax_register_virtual_size (int regno) +{ + return (4); +} + +static struct type * +vax_register_virtual_type (int regno) +{ + return (builtin_type_int); +} + +static void +vax_get_saved_register (char *raw_buffer, int *optimized, CORE_ADDR *addrp, + struct frame_info *frame, int regnum, + enum lval_type *lval) +{ + CORE_ADDR addr; + + if (!target_has_registers) + error ("No registers."); + + /* Normal systems don't optimize out things with register numbers. */ + if (optimized != NULL) + *optimized = 0; + addr = find_saved_register (frame, regnum); + if (addr != 0) + { + if (lval != NULL) + *lval = lval_memory; + if (regnum == SP_REGNUM) + { + if (raw_buffer != NULL) + { + /* Put it back in target format. */ + store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), + (LONGEST) addr); + } + if (addrp != NULL) + *addrp = 0; + return; + } + if (raw_buffer != NULL) + target_read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum)); + } + else + { + if (lval != NULL) + *lval = lval_register; + addr = REGISTER_BYTE (regnum); + if (raw_buffer != NULL) + read_register_gen (regnum, raw_buffer); + } + if (addrp != NULL) + *addrp = addr; +} + +static void +vax_frame_init_saved_regs (struct frame_info *frame) +{ + int regnum, regmask; + CORE_ADDR next_addr; + + if (frame->saved_regs) + return; + + frame_saved_regs_zalloc (frame); + + regmask = read_memory_integer (frame->frame + 4, 4) >> 16; + + next_addr = frame->frame + 16; + + /* regmask's low bit is for register 0, which is the first one + what would be pushed. */ + for (regnum = 0; regnum < AP_REGNUM; regnum++) + { + if (regmask & (1 << regnum)) + frame->saved_regs[regnum] = next_addr += 4; + } + + frame->saved_regs[SP_REGNUM] = next_addr + 4; + if (regmask & (1 << FP_REGNUM)) + frame->saved_regs[SP_REGNUM] += + 4 + (4 * read_memory_integer (next_addr + 4, 4)); + + frame->saved_regs[PC_REGNUM] = frame->frame + 16; + frame->saved_regs[FP_REGNUM] = frame->frame + 12; + frame->saved_regs[AP_REGNUM] = frame->frame + 8; + frame->saved_regs[PS_REGNUM] = frame->frame + 4; +} + +static CORE_ADDR +vax_frame_saved_pc (struct frame_info *frame) +{ + if (frame->signal_handler_caller) + return (sigtramp_saved_pc (frame)); /* XXXJRT */ + + return (read_memory_integer (frame->frame + 16, 4)); +} + +CORE_ADDR +vax_frame_args_address_correct (struct frame_info *frame) +{ + /* Cannot find the AP register value directly from the FP value. Must + find it saved in the frame called by this one, or in the AP register + for the innermost frame. However, there is no way to tell the + difference between the innermost frame and a frame for which we + just don't know the frame that it called (e.g. "info frame 0x7ffec789"). + For the sake of argument, suppose that the stack is somewhat trashed + (which is one reason that "info frame" exists). So, return 0 (indicating + we don't know the address of the arglist) if we don't know what frame + this frame calls. */ + if (frame->next) + return (read_memory_integer (frame->next->frame + 8, 4)); + + return (0); +} + +static CORE_ADDR +vax_frame_args_address (struct frame_info *frame) +{ + /* In most of GDB, getting the args address is too important to + just say "I don't know". This is sometimes wrong for functions + that aren't on top of the stack, but c'est la vie. */ + if (frame->next) + return (read_memory_integer (frame->next->frame + 8, 4)); + + return (read_register (AP_REGNUM)); +} + +static CORE_ADDR +vax_frame_locals_address (struct frame_info *frame) +{ + return (frame->frame); +} + +static int +vax_frame_num_args (struct frame_info *fi) +{ + return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1)); +} + +static CORE_ADDR +vax_frame_chain (struct frame_info *frame) +{ + /* In the case of the VAX, the frame's nominal address is the FP value, + and 12 bytes later comes the saved previous FP value as a 4-byte word. */ + if (inside_entry_file (frame->pc)) + return (0); + + return (read_memory_integer (frame->frame + 12, 4)); +} + +static void +vax_push_dummy_frame (void) +{ + CORE_ADDR sp = read_register (SP_REGNUM); + int regnum; + + sp = push_word (sp, 0); /* arglist */ + for (regnum = 11; regnum >= 0; regnum--) + sp = push_word (sp, read_register (regnum)); + sp = push_word (sp, read_register (PC_REGNUM)); + sp = push_word (sp, read_register (FP_REGNUM)); + sp = push_word (sp, read_register (AP_REGNUM)); + sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef) + 0x2fff0000); + sp = push_word (sp, 0); + write_register (SP_REGNUM, sp); + write_register (FP_REGNUM, sp); + write_register (AP_REGNUM, sp + (17 * 4)); +} + +static void +vax_pop_frame (void) +{ + CORE_ADDR fp = read_register (FP_REGNUM); + int regnum; + int regmask = read_memory_integer (fp + 4, 4); + + write_register (PS_REGNUM, + (regmask & 0xffff) + | (read_register (PS_REGNUM) & 0xffff0000)); + write_register (PC_REGNUM, read_memory_integer (fp + 16, 4)); + write_register (FP_REGNUM, read_memory_integer (fp + 12, 4)); + write_register (AP_REGNUM, read_memory_integer (fp + 8, 4)); + fp += 16; + for (regnum = 0; regnum < 12; regnum++) + if (regmask & (0x10000 << regnum)) + write_register (regnum, read_memory_integer (fp += 4, 4)); + fp = fp + 4 + ((regmask >> 30) & 3); + if (regmask & 0x20000000) + { + regnum = read_memory_integer (fp, 4); + fp += (regnum + 1) * 4; + } + write_register (SP_REGNUM, fp); + flush_cached_frames (); +} + +/* The VAX call dummy sequence: + + calls #69, @#32323232 + bpt + + It is 8 bytes long. The address and argc are patched by + vax_fix_call_dummy(). */ +static LONGEST vax_call_dummy_words[] = { 0x329f69fb, 0x03323232 }; +static int sizeof_vax_call_dummy_words = sizeof(vax_call_dummy_words); + +static void +vax_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs, + struct value **args, struct type *type, int gcc_p) +{ + dummy[1] = nargs; + store_unsigned_integer (dummy + 3, 4, fun); +} + +static void +vax_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) +{ + write_register (1, addr); +} + +static void +vax_extract_return_value (struct type *valtype, char *regbuf, char *valbuf) +{ + memcpy (valbuf, regbuf + REGISTER_BYTE (0), TYPE_LENGTH (valtype)); +} + +static void +vax_store_return_value (struct type *valtype, char *valbuf) +{ + write_register_bytes (0, valbuf, TYPE_LENGTH (valtype)); +} + +static CORE_ADDR +vax_extract_struct_value_address (char *regbuf) +{ + return (extract_address (regbuf + REGISTER_BYTE (0), REGISTER_RAW_SIZE (0))); +} + /* Advance PC across any function entry prologue instructions to reach some "real" code. */ -CORE_ADDR +static CORE_ADDR vax_skip_prologue (CORE_ADDR pc) { register int op = (unsigned char) read_memory_integer (pc, 1); @@ -81,17 +382,12 @@ vax_skip_prologue (CORE_ADDR pc) return pc; } -/* Return number of args passed to a frame. - Can return -1, meaning no way to tell. */ - -int -vax_frame_num_args (struct frame_info *fi) +static CORE_ADDR +vax_saved_pc_after_call (struct frame_info *frame) { - return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1)); + return (FRAME_SAVED_PC(frame)); } - - - + /* Print the vax instruction at address MEMADDR in debugged memory, from disassembler info INFO. Returns length of the instruction, in bytes. */ @@ -142,7 +438,7 @@ vax_print_insn (CORE_ADDR memaddr, disassemble_info *info) } return p - buffer; } - + static unsigned char * print_insn_arg (char *d, register char *p, CORE_ADDR addr, disassemble_info *info) @@ -313,9 +609,101 @@ print_insn_arg (char *d, register char *p, CORE_ADDR addr, return (unsigned char *) p; } + +/* Initialize the current architecture based on INFO. If possible, re-use an + architecture from ARCHES, which is a list of architectures already created + during this debugging session. + + Called e.g. at program startup, when reading a core file, and when reading + a binary file. */ + +static struct gdbarch * +vax_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) +{ + struct gdbarch *gdbarch; + + /* Right now there is only one VAX architecture variant. */ + if (arches != NULL) + return (arches->gdbarch); + + gdbarch = gdbarch_alloc (&info, NULL); + + /* Register info */ + set_gdbarch_num_regs (gdbarch, VAX_NUM_REGS); + set_gdbarch_sp_regnum (gdbarch, VAX_SP_REGNUM); + set_gdbarch_fp_regnum (gdbarch, VAX_FP_REGNUM); + set_gdbarch_pc_regnum (gdbarch, VAX_PC_REGNUM); + set_gdbarch_ps_regnum (gdbarch, VAX_PS_REGNUM); + + set_gdbarch_register_name (gdbarch, vax_register_name); + set_gdbarch_register_size (gdbarch, VAX_REGISTER_SIZE); + set_gdbarch_register_bytes (gdbarch, VAX_REGISTER_BYTES); + set_gdbarch_register_byte (gdbarch, vax_register_byte); + set_gdbarch_register_raw_size (gdbarch, vax_register_raw_size); + set_gdbarch_max_register_raw_size (gdbarch, VAX_MAX_REGISTER_RAW_SIZE); + set_gdbarch_register_virtual_size (gdbarch, vax_register_virtual_size); + set_gdbarch_max_register_virtual_size (gdbarch, + VAX_MAX_REGISTER_VIRTUAL_SIZE); + set_gdbarch_register_virtual_type (gdbarch, vax_register_virtual_type); + + /* Frame and stack info */ + set_gdbarch_skip_prologue (gdbarch, vax_skip_prologue); + set_gdbarch_saved_pc_after_call (gdbarch, vax_saved_pc_after_call); + + set_gdbarch_frame_num_args (gdbarch, vax_frame_num_args); + set_gdbarch_frameless_function_invocation (gdbarch, + generic_frameless_function_invocation_not); + + set_gdbarch_frame_chain (gdbarch, vax_frame_chain); + set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid); + set_gdbarch_frame_saved_pc (gdbarch, vax_frame_saved_pc); + + set_gdbarch_frame_args_address (gdbarch, vax_frame_args_address); + set_gdbarch_frame_locals_address (gdbarch, vax_frame_locals_address); + + set_gdbarch_frame_init_saved_regs (gdbarch, vax_frame_init_saved_regs); + + set_gdbarch_frame_args_skip (gdbarch, 4); + + set_gdbarch_get_saved_register (gdbarch, vax_get_saved_register); + + set_gdbarch_inner_than (gdbarch, core_addr_lessthan); + + /* Return value info */ + set_gdbarch_store_struct_return (gdbarch, vax_store_struct_return); + set_gdbarch_extract_return_value (gdbarch, vax_extract_return_value); + set_gdbarch_store_return_value (gdbarch, vax_store_return_value); + set_gdbarch_extract_struct_value_address (gdbarch, + vax_extract_struct_value_address); + + /* Call dummy info */ + set_gdbarch_push_dummy_frame (gdbarch, vax_push_dummy_frame); + set_gdbarch_pop_frame (gdbarch, vax_pop_frame); + set_gdbarch_call_dummy_location (gdbarch, ON_STACK); + set_gdbarch_call_dummy_p (gdbarch, 1); + set_gdbarch_call_dummy_words (gdbarch, vax_call_dummy_words); + set_gdbarch_sizeof_call_dummy_words (gdbarch, sizeof_vax_call_dummy_words); + set_gdbarch_fix_call_dummy (gdbarch, vax_fix_call_dummy); + set_gdbarch_call_dummy_start_offset (gdbarch, 0); + set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); + set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 7); + set_gdbarch_use_generic_dummy_frames (gdbarch, 0); + set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_on_stack); + set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); + + /* Breakpoint info */ + set_gdbarch_decr_pc_after_break (gdbarch, 0); + + /* Misc info */ + set_gdbarch_function_start_offset (gdbarch, 2); + + return (gdbarch); +} void _initialize_vax_tdep (void) { + gdbarch_register (bfd_arch_vax, vax_gdbarch_init, NULL); + tm_print_insn = vax_print_insn; } |