/* 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
+ Free Software Foundation, Inc.
This file is part of GDB.
#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 "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_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_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. */
+
+/* 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
static unsigned char *print_insn_arg ();
\f
+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);
+}
+\f
+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 < VAX_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[VAX_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 (VAX_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));
+}
+\f
+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);
+}
+\f
+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)));
+}
+\f
+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);
+}
+\f
/* Advance PC across any function entry prologue instructions
to reach some "real" code. */
-CORE_ADDR
-vax_skip_prologue (pc)
- CORE_ADDR pc;
+static CORE_ADDR
+vax_skip_prologue (CORE_ADDR pc)
{
register int op = (unsigned char) read_memory_integer (pc, 1);
if (op == 0x11)
return pc;
}
-/* Return number of args passed to a frame.
- Can return -1, meaning no way to tell. */
-
-int
-vax_frame_num_args (fi)
- 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));
}
-
-
-
+\f
/* 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)
}
return p - buffer;
}
-
+\f
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;
return (unsigned char *) p;
}
+\f
+/* 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_tdep *tdep;
+ struct gdbarch *gdbarch;
+ enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
+
+ /* Try to determine the ABI of the object we are loading. */
+
+ if (info.abfd != NULL)
+ osabi = gdbarch_lookup_osabi (info.abfd);
+
+ /* Find a candidate among extant architectures. */
+ for (arches = gdbarch_list_lookup_by_info (arches, &info);
+ arches != NULL;
+ arches = gdbarch_list_lookup_by_info (arches->next, &info))
+ {
+ /* Make sure the ABI selection matches. */
+ tdep = gdbarch_tdep (arches->gdbarch);
+ if (tdep && tdep->osabi == osabi)
+ return arches->gdbarch;
+ }
+
+ tdep = xmalloc (sizeof (struct gdbarch_tdep));
+ gdbarch = gdbarch_alloc (&info, tdep);
+
+ tdep->osabi = osabi;
+
+ /* 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_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_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_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, osabi);
+
+ return (gdbarch);
+}
+
+static void
+vax_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ if (tdep == NULL)
+ return;
+
+ fprintf_unfiltered (file, "vax_dump_tdep: OS ABI = %s\n",
+ gdbarch_osabi_name (tdep->osabi));
+}
void
-_initialize_vax_tdep ()
+_initialize_vax_tdep (void)
{
+ gdbarch_register (bfd_arch_vax, vax_gdbarch_init, vax_dump_tdep);
+
tm_print_insn = vax_print_insn;
}
projects / deliverable / binutils-gdb.git / blobdiff