X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fvax-tdep.c;h=f5cd2676e85843b794bd4056acaa39618ae5f4e4;hb=8a2dbca8e1673fc826e7d898bb7f53862dcd8216;hp=b378571ec566c6628efdb878466db8aeb7553bf5;hpb=c906108c21474dfb4ed285bcc0ac6fe02cd400cc;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/vax-tdep.c b/gdb/vax-tdep.c index b378571ec5..f5cd2676e8 100644 --- a/gdb/vax-tdep.c +++ b/gdb/vax-tdep.c @@ -1,25 +1,76 @@ /* Print VAX instructions for GDB, the GNU debugger. - Copyright 1986, 1989, 1991, 1992, 1996 Free Software Foundation, Inc. + Copyright 1986, 1989, 1991, 1992, 1995, 1996, 1998, 1999, 2000, 2002, 2003 + Free Software Foundation, Inc. -This file is part of GDB. + 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 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. + 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + 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., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ #include "defs.h" #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 "gdb_string.h" +#include "osabi.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_args_address_ftype vax_frame_args_address; +static gdbarch_frame_locals_address_ftype vax_frame_locals_address; + +static gdbarch_store_struct_return_ftype vax_store_struct_return; +static gdbarch_deprecated_extract_return_value_ftype vax_extract_return_value; +static gdbarch_deprecated_extract_struct_value_address_ftype + vax_extract_struct_value_address; + +static gdbarch_deprecated_push_dummy_frame_ftype vax_push_dummy_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. */ + +/* FIXME: cagney/2002-01-19: The macro below was originally defined in + tm-vax.h and used in values.c. Two problems. Firstly this is a + very non-portable and secondly it is wrong. The VAX should be + using floatformat and associated methods to identify and handle + invalid floating-point values. Adding to the poor target's woes + there is no floatformat_vax_{f,d} and no TARGET_FLOAT_FORMAT + et.al.. */ + +/* FIXME: cagney/2002-01-19: It turns out that the only thing that + uses this macro is the vax disassembler code (so how old is this + target?). This target should instead be using the opcodes + disassembler. That allowing the macro to be eliminated. */ + +#define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000) /* Vax instructions are never longer than this. */ #define MAXLEN 62 @@ -29,19 +80,313 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ static unsigned char *print_insn_arg (); +static const 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_frame_init_saved_regs (struct frame_info *frame) +{ + int regnum, regmask; + CORE_ADDR next_addr; + + if (get_frame_saved_regs (frame)) + return; + + frame_saved_regs_zalloc (frame); + + regmask = read_memory_integer (get_frame_base (frame) + 4, 4) >> 16; + + next_addr = get_frame_base (frame) + 16; + + /* regmask's low bit is for register 0, which is the first one + what would be pushed. */ + for (regnum = 0; regnum < VAX_AP_REGNUM; regnum++) + { + if (regmask & (1 << regnum)) + get_frame_saved_regs (frame)[regnum] = next_addr += 4; + } + + get_frame_saved_regs (frame)[SP_REGNUM] = next_addr + 4; + if (regmask & (1 << FP_REGNUM)) + get_frame_saved_regs (frame)[SP_REGNUM] += + 4 + (4 * read_memory_integer (next_addr + 4, 4)); + + get_frame_saved_regs (frame)[PC_REGNUM] = get_frame_base (frame) + 16; + get_frame_saved_regs (frame)[FP_REGNUM] = get_frame_base (frame) + 12; + get_frame_saved_regs (frame)[VAX_AP_REGNUM] = get_frame_base (frame) + 8; + get_frame_saved_regs (frame)[PS_REGNUM] = get_frame_base (frame) + 4; +} + +/* Get saved user PC for sigtramp from sigcontext for BSD style sigtramp. */ + +static CORE_ADDR +vax_sigtramp_saved_pc (struct frame_info *frame) +{ + CORE_ADDR sigcontext_addr; + char *buf; + int ptrbytes = TYPE_LENGTH (builtin_type_void_func_ptr); + int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT; + + buf = alloca (ptrbytes); + /* Get sigcontext address, it is the third parameter on the stack. */ + if (get_next_frame (frame)) + sigcontext_addr = read_memory_typed_address + (FRAME_ARGS_ADDRESS (get_next_frame (frame)) + + FRAME_ARGS_SKIP + sigcontext_offs, + builtin_type_void_data_ptr); + else + sigcontext_addr = read_memory_typed_address + (read_register (SP_REGNUM) + sigcontext_offs, builtin_type_void_data_ptr); + + /* Don't cause a memory_error when accessing sigcontext in case the stack + layout has changed or the stack is corrupt. */ + target_read_memory (sigcontext_addr + SIGCONTEXT_PC_OFFSET, buf, ptrbytes); + return extract_typed_address (buf, builtin_type_void_func_ptr); +} + +static CORE_ADDR +vax_frame_saved_pc (struct frame_info *frame) +{ + if ((get_frame_type (frame) == SIGTRAMP_FRAME)) + return (vax_sigtramp_saved_pc (frame)); /* XXXJRT */ + + return (read_memory_integer (get_frame_base (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 (get_next_frame (frame)) + return (read_memory_integer (get_frame_base (get_next_frame (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 (get_next_frame (frame)) + return (read_memory_integer (get_frame_base (get_next_frame (frame)) + 8, 4)); + + return (read_register (VAX_AP_REGNUM)); +} + +static CORE_ADDR +vax_frame_locals_address (struct frame_info *frame) +{ + return (get_frame_base (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 (get_frame_pc (frame))) + return (0); + + return (read_memory_integer (get_frame_base (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 (VAX_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 (VAX_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 (VAX_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) +{ + deprecated_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))); +} + +static const unsigned char * +vax_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) +{ + static const unsigned char vax_breakpoint[] = { 3 }; + + *lenptr = sizeof(vax_breakpoint); + return (vax_breakpoint); +} + +/* Advance PC across any function entry prologue instructions + to reach some "real" code. */ + +static CORE_ADDR +vax_skip_prologue (CORE_ADDR pc) +{ + register int op = (unsigned char) read_memory_integer (pc, 1); + if (op == 0x11) + pc += 2; /* skip brb */ + if (op == 0x31) + pc += 3; /* skip brw */ + if (op == 0xC2 + && ((unsigned char) read_memory_integer (pc + 2, 1)) == 0x5E) + pc += 3; /* skip subl2 */ + if (op == 0x9E + && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xAE + && ((unsigned char) read_memory_integer (pc + 3, 1)) == 0x5E) + pc += 4; /* skip movab */ + if (op == 0x9E + && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xCE + && ((unsigned char) read_memory_integer (pc + 4, 1)) == 0x5E) + pc += 5; /* skip movab */ + if (op == 0x9E + && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xEE + && ((unsigned char) read_memory_integer (pc + 6, 1)) == 0x5E) + pc += 7; /* skip movab */ + return pc; +} + +static CORE_ADDR +vax_saved_pc_after_call (struct frame_info *frame) +{ + return (DEPRECATED_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. */ static int -vax_print_insn (memaddr, info) - CORE_ADDR memaddr; - disassemble_info *info; +vax_print_insn (CORE_ADDR memaddr, disassemble_info *info) { unsigned char buffer[MAXLEN]; register int i; register unsigned char *p; - register char *d; + const char *d; int status = (*info->read_memory_func) (memaddr, buffer, MAXLEN, info); if (status != 0) @@ -52,7 +397,7 @@ vax_print_insn (memaddr, info) for (i = 0; i < NOPCODES; i++) if (votstrs[i].detail.code == buffer[0] - || votstrs[i].detail.code == *(unsigned short *)buffer) + || votstrs[i].detail.code == *(unsigned short *) buffer) break; /* Handle undefined instructions. */ @@ -81,13 +426,10 @@ vax_print_insn (memaddr, info) } return p - buffer; } - + static unsigned char * -print_insn_arg (d, p, addr, info) - char *d; - register char *p; - CORE_ADDR addr; - disassemble_info *info; +print_insn_arg (char *d, register char *p, CORE_ADDR addr, + disassemble_info *info) { register int regnum = *p & 0xf; float floatlitbuf; @@ -98,7 +440,7 @@ print_insn_arg (d, p, addr, info) (*info->fprintf_func) (info->stream, "0x%x", addr + *p++ + 1); else { - (*info->fprintf_func) (info->stream, "0x%x", addr + *(short *)p + 2); + (*info->fprintf_func) (info->stream, "0x%x", addr + *(short *) p + 2); p += 2; } } @@ -111,7 +453,7 @@ print_insn_arg (d, p, addr, info) case 3: /* Literal mode */ if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h') { - *(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4); + *(int *) &floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4); (*info->fprintf_func) (info->stream, "$%f", floatlitbuf); } else @@ -138,7 +480,7 @@ print_insn_arg (d, p, addr, info) if (regnum == PC_REGNUM) { (*info->fprintf_func) (info->stream, "#"); - info->target = *(long *)p; + info->target = *(long *) p; (*info->print_address_func) (info->target, info); p += 4; break; @@ -154,25 +496,25 @@ print_insn_arg (d, p, addr, info) break; case 'w': - (*info->fprintf_func) (info->stream, "%d", *(short *)p); + (*info->fprintf_func) (info->stream, "%d", *(short *) p); p += 2; break; case 'l': - (*info->fprintf_func) (info->stream, "%d", *(long *)p); + (*info->fprintf_func) (info->stream, "%d", *(long *) p); p += 4; break; case 'q': (*info->fprintf_func) (info->stream, "0x%x%08x", - ((long *)p)[1], ((long *)p)[0]); + ((long *) p)[1], ((long *) p)[0]); p += 8; break; case 'o': (*info->fprintf_func) (info->stream, "0x%x%08x%08x%08x", - ((long *)p)[3], ((long *)p)[2], - ((long *)p)[1], ((long *)p)[0]); + ((long *) p)[3], ((long *) p)[2], + ((long *) p)[1], ((long *) p)[0]); p += 16; break; @@ -190,7 +532,7 @@ print_insn_arg (d, p, addr, info) if (INVALID_FLOAT (p, 8)) (*info->fprintf_func) (info->stream, "<>", - ((long *)p)[1], ((long *)p)[0]); + ((long *) p)[1], ((long *) p)[0]); else (*info->fprintf_func) (info->stream, "%f", *(double *) p); p += 8; @@ -230,12 +572,12 @@ print_insn_arg (d, p, addr, info) case 12: /* Word displacement */ if (regnum == PC_REGNUM) { - info->target = addr + *(short *)p + 3; + info->target = addr + *(short *) p + 3; (*info->print_address_func) (info->target, info); } else (*info->fprintf_func) (info->stream, "%d(%s)", - *(short *)p, REGISTER_NAME (regnum)); + *(short *) p, REGISTER_NAME (regnum)); p += 2; break; @@ -244,20 +586,118 @@ print_insn_arg (d, p, addr, info) case 14: /* Long displacement */ if (regnum == PC_REGNUM) { - info->target = addr + *(short *)p + 5; + info->target = addr + *(short *) p + 5; (*info->print_address_func) (info->target, info); } else (*info->fprintf_func) (info->stream, "%d(%s)", - *(long *)p, REGISTER_NAME (regnum)); + *(long *) p, REGISTER_NAME (regnum)); p += 4; } 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; + + /* If there is already a candidate, use it. */ + arches = gdbarch_list_lookup_by_info (arches, &info); + if (arches != NULL) + return arches->gdbarch; + + gdbarch = gdbarch_alloc (&info, NULL); + + /* NOTE: cagney/2002-12-06: This can be deleted when this arch is + ready to unwind the PC first (see frame.c:get_prev_frame()). */ + set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default); + + /* 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_deprecated_max_register_raw_size (gdbarch, VAX_MAX_REGISTER_RAW_SIZE); + set_gdbarch_register_virtual_size (gdbarch, vax_register_virtual_size); + set_gdbarch_deprecated_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_deprecated_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_deprecated_frame_init_saved_regs (gdbarch, vax_frame_init_saved_regs); + + set_gdbarch_frame_args_skip (gdbarch, 4); + + set_gdbarch_inner_than (gdbarch, core_addr_lessthan); + + /* Return value info */ + set_gdbarch_store_struct_return (gdbarch, vax_store_struct_return); + set_gdbarch_deprecated_extract_return_value (gdbarch, vax_extract_return_value); + set_gdbarch_deprecated_store_return_value (gdbarch, vax_store_return_value); + set_gdbarch_deprecated_extract_struct_value_address (gdbarch, vax_extract_struct_value_address); + + /* Call dummy info */ + set_gdbarch_deprecated_push_dummy_frame (gdbarch, vax_push_dummy_frame); + set_gdbarch_deprecated_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_deprecated_use_generic_dummy_frames (gdbarch, 0); + set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_on_stack); + set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); + + /* Breakpoint info */ + set_gdbarch_breakpoint_from_pc (gdbarch, vax_breakpoint_from_pc); + set_gdbarch_decr_pc_after_break (gdbarch, 0); + + /* Misc info */ + set_gdbarch_function_start_offset (gdbarch, 2); + set_gdbarch_believe_pcc_promotion (gdbarch, 1); + + /* Hook in ABI-specific overrides, if they have been registered. */ + gdbarch_init_osabi (info, gdbarch); + + return (gdbarch); +} void -_initialize_vax_tdep () +_initialize_vax_tdep (void) { + gdbarch_register (bfd_arch_vax, vax_gdbarch_init, NULL); + tm_print_insn = vax_print_insn; }