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-rw-r--r--gdb/mips-tdep.c679
1 files changed, 679 insertions, 0 deletions
diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c
new file mode 100644
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--- /dev/null
+++ b/gdb/mips-tdep.c
@@ -0,0 +1,679 @@
+/* Work with core dump and executable files, for GDB on MIPS.
+ This code would be in core.c if it weren't machine-dependent. */
+
+/* Low level interface to ptrace, for GDB when running under Unix.
+ Copyright (C) 1988, 1989, 1990 Free Software Foundation, Inc.
+ Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
+ and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
+
+This file is part of GDB.
+
+GDB 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 1, or (at your option)
+any later version.
+
+GDB 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 GDB; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* FIXME: Can a MIPS porter/tester determine which of these include
+ files we still need? -- gnu@cygnus.com */
+#include <stdio.h>
+#include <mips/inst.h>
+#include "defs.h"
+#include "param.h"
+#include "frame.h"
+#include "inferior.h"
+#include "symtab.h"
+#include "value.h"
+#include "gdbcmd.h"
+
+#ifdef USG
+#include <sys/types.h>
+#endif
+
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+
+#include "gdbcore.h"
+
+#ifndef MIPSMAGIC
+#ifdef MIPSEL
+#define MIPSMAGIC MIPSELMAGIC
+#else
+#define MIPSMAGIC MIPSEBMAGIC
+#endif
+#endif
+
+#define VM_MIN_ADDRESS (unsigned)0x400000
+
+#include <sys/user.h> /* After a.out.h */
+#include <sys/file.h>
+#include <sys/stat.h>
+
+
+#define PROC_LOW_ADDR(proc) ((proc)->adr) /* least address */
+#define PROC_HIGH_ADDR(proc) ((proc)->pad2) /* upper address bound */
+#define PROC_FRAME_OFFSET(proc) ((proc)->framesize)
+#define PROC_FRAME_REG(proc) ((proc)->framereg)
+#define PROC_REG_MASK(proc) ((proc)->regmask)
+#define PROC_FREG_MASK(proc) ((proc)->fregmask)
+#define PROC_REG_OFFSET(proc) ((proc)->regoffset)
+#define PROC_FREG_OFFSET(proc) ((proc)->fregoffset)
+#define PROC_PC_REG(proc) ((proc)->pcreg)
+#define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->isym)
+#define _PROC_MAGIC_ 0x0F0F0F0F
+#define PROC_DESC_IS_DUMMY(proc) ((proc)->isym == _PROC_MAGIC_)
+#define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->isym = _PROC_MAGIC_)
+
+struct linked_proc_info
+{
+ struct mips_extra_func_info info;
+ struct linked_proc_info *next;
+} * linked_proc_desc_table = NULL;
+
+
+#define READ_FRAME_REG(fi, regno) read_next_frame_reg((fi)->next, regno)
+
+int
+read_next_frame_reg(fi, regno)
+ FRAME fi;
+ int regno;
+{
+#define SIGFRAME_BASE sizeof(struct sigcontext)
+#define SIGFRAME_PC_OFF (-SIGFRAME_BASE+ 2*sizeof(int))
+#define SIGFRAME_SP_OFF (-SIGFRAME_BASE+32*sizeof(int))
+#define SIGFRAME_RA_OFF (-SIGFRAME_BASE+34*sizeof(int))
+ for (; fi; fi = fi->next)
+ if (in_sigtramp(fi->pc, 0)) {
+ /* No idea if this code works. --PB. */
+ int offset;
+ if (regno == PC_REGNUM) offset = SIGFRAME_PC_OFF;
+ else if (regno == RA_REGNUM) offset = SIGFRAME_RA_OFF;
+ else if (regno == SP_REGNUM) offset = SIGFRAME_SP_OFF;
+ else return 0;
+ return read_memory_integer(fi->frame + offset, 4);
+ }
+ else if (regno == SP_REGNUM) return fi->frame;
+ else if (fi->saved_regs->regs[regno])
+ return read_memory_integer(fi->saved_regs->regs[regno], 4);
+ return read_register(regno);
+}
+
+int
+mips_frame_saved_pc(frame)
+ FRAME frame;
+{
+ mips_extra_func_info_t proc_desc = (mips_extra_func_info_t)frame->proc_desc;
+ int pcreg = proc_desc ? PROC_PC_REG(proc_desc) : RA_REGNUM;
+ if (proc_desc && PROC_DESC_IS_DUMMY(proc_desc))
+ return read_memory_integer(frame->frame - 4, 4);
+#if 0
+ /* If in the procedure prologue, RA_REGNUM might not have been saved yet.
+ * Assume non-leaf functions start with:
+ * addiu $sp,$sp,-frame_size
+ * sw $ra,ra_offset($sp)
+ * This if the pc is pointing at either of these instructions,
+ * then $ra hasn't been trashed.
+ * If the pc has advanced beyond these two instructions,
+ * then $ra has been saved.
+ * critical, and much more complex. Handling $ra is enough to get
+ * a stack trace, but some register values with be wrong.
+ */
+ if (frame->proc_desc && frame->pc < PROC_LOW_ADDR(proc_desc) + 8)
+ return read_register(pcreg);
+#endif
+ return read_next_frame_reg(frame, pcreg);
+}
+
+static struct mips_extra_func_info temp_proc_desc;
+static struct frame_saved_regs temp_saved_regs;
+
+CORE_ADDR heuristic_proc_start(pc)
+ CORE_ADDR pc;
+{
+
+ CORE_ADDR start_pc = pc;
+ CORE_ADDR fence = start_pc - 10000;
+ if (fence < VM_MIN_ADDRESS) fence = VM_MIN_ADDRESS;
+ /* search back for previous return */
+ for (start_pc -= 4; ; start_pc -= 4)
+ if (start_pc < fence) return 0;
+ else if (ABOUT_TO_RETURN(start_pc))
+ break;
+
+ start_pc += 8; /* skip return, and its delay slot */
+#if 0
+ /* skip nops (usually 1) 0 - is this */
+ while (start_pc < pc && read_memory_integer (start_pc, 4) == 0)
+ start_pc += 4;
+#endif
+ return start_pc;
+}
+
+mips_extra_func_info_t
+heuristic_proc_desc(start_pc, limit_pc, next_frame)
+ CORE_ADDR start_pc, limit_pc;
+ FRAME next_frame;
+{
+ CORE_ADDR sp = next_frame ? next_frame->frame : read_register (SP_REGNUM);
+ CORE_ADDR cur_pc;
+ int frame_size;
+ int has_frame_reg = 0;
+ int reg30; /* Value of $r30. Used by gcc for frame-pointer */
+ unsigned long reg_mask = 0;
+
+ if (start_pc == 0) return NULL;
+ bzero(&temp_proc_desc, sizeof(temp_proc_desc));
+ bzero(&temp_saved_regs, sizeof(struct frame_saved_regs));
+ if (start_pc + 200 < limit_pc) limit_pc = start_pc + 200;
+ restart:
+ frame_size = 0;
+ for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4) {
+ unsigned long word;
+ int status;
+
+ status = read_memory_nobpt (cur_pc, &word, 4);
+ if (status) memory_error (status, cur_pc);
+ if ((word & 0xFFFF0000) == 0x27bd0000) /* addiu $sp,$sp,-i */
+ frame_size += (-word) & 0xFFFF;
+ else if ((word & 0xFFFF0000) == 0x23bd0000) /* addu $sp,$sp,-i */
+ frame_size += (-word) & 0xFFFF;
+ else if ((word & 0xFFE00000) == 0xafa00000) { /* sw reg,offset($sp) */
+ int reg = (word & 0x001F0000) >> 16;
+ reg_mask |= 1 << reg;
+ temp_saved_regs.regs[reg] = sp + (short)word;
+ }
+ else if ((word & 0xFFFF0000) == 0x27be0000) { /* addiu $30,$sp,size */
+ if ((unsigned short)word != frame_size)
+ reg30 = sp + (unsigned short)word;
+ else if (!has_frame_reg) {
+ int alloca_adjust;
+ has_frame_reg = 1;
+ reg30 = read_next_frame_reg(next_frame, 30);
+ alloca_adjust = reg30 - (sp + (unsigned short)word);
+ if (alloca_adjust > 0) {
+ /* FP > SP + frame_size. This may be because
+ /* of an alloca or somethings similar.
+ * Fix sp to "pre-alloca" value, and try again.
+ */
+ sp += alloca_adjust;
+ goto restart;
+ }
+ }
+ }
+ else if ((word & 0xFFE00000) == 0xafc00000) { /* sw reg,offset($30) */
+ int reg = (word & 0x001F0000) >> 16;
+ reg_mask |= 1 << reg;
+ temp_saved_regs.regs[reg] = reg30 + (short)word;
+ }
+ }
+ if (has_frame_reg) {
+ PROC_FRAME_REG(&temp_proc_desc) = 30;
+ PROC_FRAME_OFFSET(&temp_proc_desc) = 0;
+ }
+ else {
+ PROC_FRAME_REG(&temp_proc_desc) = SP_REGNUM;
+ PROC_FRAME_OFFSET(&temp_proc_desc) = frame_size;
+ }
+ PROC_REG_MASK(&temp_proc_desc) = reg_mask;
+ PROC_PC_REG(&temp_proc_desc) = RA_REGNUM;
+ return &temp_proc_desc;
+}
+
+mips_extra_func_info_t
+find_proc_desc(pc, next_frame)
+ CORE_ADDR pc;
+ FRAME next_frame;
+{
+ mips_extra_func_info_t proc_desc;
+ extern struct block *block_for_pc();
+ struct block *b = block_for_pc(pc);
+
+ struct symbol *sym =
+ b ? lookup_symbol(".gdbinfo.", b, LABEL_NAMESPACE, 0, NULL) : NULL;
+ if (sym != NULL)
+ {
+ /* IF this is the topmost frame AND
+ * (this proc does not have debugging information OR
+ * the PC is in the procedure prologue)
+ * THEN create a "hueristic" proc_desc (by analyzing
+ * the actual code) to replace the "official" proc_desc.
+ */
+ proc_desc = (struct mips_extra_func_info *)sym->value.value;
+ if (next_frame == NULL) {
+ struct symtab_and_line val;
+ struct symbol *proc_symbol =
+ PROC_DESC_IS_DUMMY(proc_desc) ? 0 : PROC_SYMBOL(proc_desc);
+ if (proc_symbol) {
+ val = find_pc_line (BLOCK_START
+ (SYMBOL_BLOCK_VALUE(proc_symbol)),
+ 0);
+ val.pc = val.end ? val.end : pc;
+ }
+ if (!proc_symbol || pc < val.pc) {
+ mips_extra_func_info_t found_heuristic =
+ heuristic_proc_desc(PROC_LOW_ADDR(proc_desc),
+ pc, next_frame);
+ if (found_heuristic) proc_desc = found_heuristic;
+ }
+ }
+ }
+ else
+ {
+ register struct linked_proc_info *link;
+ for (link = linked_proc_desc_table; link; link = link->next)
+ if (PROC_LOW_ADDR(&link->info) <= pc
+ && PROC_HIGH_ADDR(&link->info) > pc)
+ return &link->info;
+ proc_desc =
+ heuristic_proc_desc(heuristic_proc_start(pc), pc, next_frame);
+ }
+ return proc_desc;
+}
+
+mips_extra_func_info_t cached_proc_desc;
+
+FRAME_ADDR mips_frame_chain(frame)
+ FRAME frame;
+{
+ extern CORE_ADDR startup_file_start; /* From blockframe.c */
+ mips_extra_func_info_t proc_desc;
+ CORE_ADDR saved_pc = FRAME_SAVED_PC(frame);
+ if (startup_file_start)
+ { /* has at least the __start symbol */
+ if (saved_pc == 0 || !outside_startup_file (saved_pc)) return 0;
+ }
+ else
+ { /* This hack depends on the internals of __start. */
+ /* We also assume the breakpoints are *not* inserted */
+ if (read_memory_integer (saved_pc + 8, 4) & 0xFC00003F == 0xD)
+ return 0; /* break */
+ }
+ proc_desc = find_proc_desc(saved_pc, frame);
+ if (!proc_desc) return 0;
+ cached_proc_desc = proc_desc;
+ return read_next_frame_reg(frame, PROC_FRAME_REG(proc_desc))
+ + PROC_FRAME_OFFSET(proc_desc);
+}
+
+void
+init_extra_frame_info(fci)
+ struct frame_info *fci;
+{
+ extern struct obstack frame_cache_obstack;
+ /* Use proc_desc calculated in frame_chain */
+ mips_extra_func_info_t proc_desc = fci->next ? cached_proc_desc :
+ find_proc_desc(fci->pc, fci->next);
+ fci->saved_regs = (struct frame_saved_regs*)
+ obstack_alloc (&frame_cache_obstack, sizeof(struct frame_saved_regs));
+ bzero(fci->saved_regs, sizeof(struct frame_saved_regs));
+ fci->proc_desc =
+ proc_desc == &temp_proc_desc ? (char*)NULL : (char*)proc_desc;
+ if (proc_desc)
+ {
+ int ireg;
+ CORE_ADDR reg_position;
+ unsigned long mask;
+ /* r0 bit means kernel trap */
+ int kernel_trap = PROC_REG_MASK(proc_desc) & 1;
+
+ /* Fixup frame-pointer - only needed for top frame */
+ /* This may not be quite right, if procedure has a real frame register */
+ if (fci->pc == PROC_LOW_ADDR(proc_desc))
+ fci->frame = read_register (SP_REGNUM);
+ else
+ fci->frame = READ_FRAME_REG(fci, PROC_FRAME_REG(proc_desc))
+ + PROC_FRAME_OFFSET(proc_desc);
+
+ if (proc_desc == &temp_proc_desc)
+ *fci->saved_regs = temp_saved_regs;
+ else
+ {
+ /* find which general-purpose registers were saved */
+ reg_position = fci->frame + PROC_REG_OFFSET(proc_desc);
+ mask = kernel_trap ? 0xFFFFFFFF : PROC_REG_MASK(proc_desc);
+ for (ireg= 31; mask; --ireg, mask <<= 1)
+ if (mask & 0x80000000)
+ {
+ fci->saved_regs->regs[ireg] = reg_position;
+ reg_position -= 4;
+ }
+ /* find which floating-point registers were saved */
+ reg_position = fci->frame + PROC_FREG_OFFSET(proc_desc);
+ /* The freg_offset points to where the first *double* register is saved.
+ * So skip to the high-order word. */
+ reg_position += 4;
+ mask = kernel_trap ? 0xFFFFFFFF : PROC_FREG_MASK(proc_desc);
+ for (ireg = 31; mask; --ireg, mask <<= 1)
+ if (mask & 0x80000000)
+ {
+ fci->saved_regs->regs[32+ireg] = reg_position;
+ reg_position -= 4;
+ }
+ }
+
+ /* hack: if argument regs are saved, guess these contain args */
+ if ((PROC_REG_MASK(proc_desc) & 0xF0) == 0) fci->num_args = -1;
+ else if ((PROC_REG_MASK(proc_desc) & 0x80) == 0) fci->num_args = 4;
+ else if ((PROC_REG_MASK(proc_desc) & 0x40) == 0) fci->num_args = 3;
+ else if ((PROC_REG_MASK(proc_desc) & 0x20) == 0) fci->num_args = 2;
+ else if ((PROC_REG_MASK(proc_desc) & 0x10) == 0) fci->num_args = 1;
+
+ fci->saved_regs->regs[PC_REGNUM] = fci->saved_regs->regs[RA_REGNUM];
+ }
+ if (fci->next == 0)
+ supply_register(FP_REGNUM, &fci->frame);
+}
+
+
+CORE_ADDR mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
+ int nargs;
+ value *args;
+ CORE_ADDR sp;
+ int struct_return;
+ CORE_ADDR struct_addr;
+{
+ CORE_ADDR buf;
+ register i;
+ int accumulate_size = struct_return ? 4 : 0;
+ struct mips_arg { char *contents; int len; int offset; };
+ struct mips_arg *mips_args =
+ (struct mips_arg*)alloca(nargs * sizeof(struct mips_arg));
+ register struct mips_arg *m_arg;
+ for (i = 0, m_arg = mips_args; i < nargs; i++, m_arg++) {
+ extern value value_arg_coerce();
+ value arg = value_arg_coerce (args[i]);
+ m_arg->len = TYPE_LENGTH (VALUE_TYPE (arg));
+ /* This entire mips-specific routine is because doubles must be aligned
+ * on 8-byte boundaries. It still isn't quite right, because MIPS decided
+ * to align 'struct {int a, b}' on 4-byte boundaries (even though this
+ * breaks their varargs implementation...). A correct solution
+ * requires an simulation of gcc's 'alignof' (and use of 'alignof'
+ * in stdarg.h/varargs.h).
+ */
+ if (m_arg->len > 4) accumulate_size = (accumulate_size + 7) & -8;
+ m_arg->offset = accumulate_size;
+ accumulate_size = (accumulate_size + m_arg->len + 3) & -4;
+ m_arg->contents = VALUE_CONTENTS(arg);
+ }
+ accumulate_size = (accumulate_size + 7) & (-8);
+ if (accumulate_size < 16) accumulate_size = 16;
+ sp -= accumulate_size;
+ for (i = nargs; m_arg--, --i >= 0; )
+ write_memory(sp + m_arg->offset, m_arg->contents, m_arg->len);
+ if (struct_return) {
+ buf = struct_addr;
+ write_memory(sp, &buf, sizeof(CORE_ADDR));
+}
+ return sp;
+}
+
+/* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */
+#define MASK(i,j) ((1 << (j)+1)-1 ^ (1 << (i))-1)
+
+void
+mips_push_dummy_frame()
+{
+ int ireg;
+ struct linked_proc_info *link = (struct linked_proc_info*)
+ xmalloc(sizeof(struct linked_proc_info));
+ mips_extra_func_info_t proc_desc = &link->info;
+ CORE_ADDR sp = read_register (SP_REGNUM);
+ CORE_ADDR save_address;
+ REGISTER_TYPE buffer;
+ link->next = linked_proc_desc_table;
+ linked_proc_desc_table = link;
+#define PUSH_FP_REGNUM 16 /* must be a register preserved across calls */
+#define GEN_REG_SAVE_MASK MASK(1,16)|MASK(24,28)|(1<<31)
+#define GEN_REG_SAVE_COUNT 22
+#define FLOAT_REG_SAVE_MASK MASK(0,19)
+#define FLOAT_REG_SAVE_COUNT 20
+#define SPECIAL_REG_SAVE_COUNT 4
+ /*
+ * The registers we must save are all those not preserved across
+ * procedure calls. Dest_Reg (see tm-mips.h) must also be saved.
+ * In addition, we must save the PC, and PUSH_FP_REGNUM.
+ * (Ideally, we should also save MDLO/-HI and FP Control/Status reg.)
+ *
+ * Dummy frame layout:
+ * (high memory)
+ * Saved PC
+ * Saved MMHI, MMLO, FPC_CSR
+ * Saved R31
+ * Saved R28
+ * ...
+ * Saved R1
+ * Saved D18 (i.e. F19, F18)
+ * ...
+ * Saved D0 (i.e. F1, F0)
+ * CALL_DUMMY (subroutine stub; see m-mips.h)
+ * Parameter build area (not yet implemented)
+ * (low memory)
+ */
+ PROC_REG_MASK(proc_desc) = GEN_REG_SAVE_MASK;
+ PROC_FREG_MASK(proc_desc) = FLOAT_REG_SAVE_MASK;
+ PROC_REG_OFFSET(proc_desc) = /* offset of (Saved R31) from FP */
+ -sizeof(long) - 4 * SPECIAL_REG_SAVE_COUNT;
+ PROC_FREG_OFFSET(proc_desc) = /* offset of (Saved D18) from FP */
+ -sizeof(double) - 4 * (SPECIAL_REG_SAVE_COUNT + GEN_REG_SAVE_COUNT);
+ /* save general registers */
+ save_address = sp + PROC_REG_OFFSET(proc_desc);
+ for (ireg = 32; --ireg >= 0; )
+ if (PROC_REG_MASK(proc_desc) & (1 << ireg))
+ {
+ buffer = read_register (ireg);
+ write_memory (save_address, &buffer, sizeof(REGISTER_TYPE));
+ save_address -= 4;
+ }
+ /* save floating-points registers */
+ save_address = sp + PROC_FREG_OFFSET(proc_desc);
+ for (ireg = 32; --ireg >= 0; )
+ if (PROC_FREG_MASK(proc_desc) & (1 << ireg))
+ {
+ buffer = read_register (ireg);
+ write_memory (save_address, &buffer, 4);
+ save_address -= 4;
+ }
+ write_register (PUSH_FP_REGNUM, sp);
+ PROC_FRAME_REG(proc_desc) = PUSH_FP_REGNUM;
+ PROC_FRAME_OFFSET(proc_desc) = 0;
+ buffer = read_register (PC_REGNUM);
+ write_memory (sp - 4, &buffer, sizeof(REGISTER_TYPE));
+ buffer = read_register (HI_REGNUM);
+ write_memory (sp - 8, &buffer, sizeof(REGISTER_TYPE));
+ buffer = read_register (LO_REGNUM);
+ write_memory (sp - 12, &buffer, sizeof(REGISTER_TYPE));
+ buffer = read_register (FCRCS_REGNUM);
+ write_memory (sp - 16, &buffer, sizeof(REGISTER_TYPE));
+ sp -= 4 * (GEN_REG_SAVE_COUNT+FLOAT_REG_SAVE_COUNT+SPECIAL_REG_SAVE_COUNT);
+ write_register (SP_REGNUM, sp);
+ PROC_LOW_ADDR(proc_desc) = sp - CALL_DUMMY_SIZE + CALL_DUMMY_START_OFFSET;
+ PROC_HIGH_ADDR(proc_desc) = sp;
+ SET_PROC_DESC_IS_DUMMY(proc_desc);
+ PROC_PC_REG(proc_desc) = RA_REGNUM;
+}
+
+void
+mips_pop_frame()
+{ register int regnum;
+ FRAME frame = get_current_frame ();
+ CORE_ADDR new_sp = frame->frame;
+ mips_extra_func_info_t proc_desc = (mips_extra_func_info_t)frame->proc_desc;
+ if (PROC_DESC_IS_DUMMY(proc_desc))
+ {
+ struct linked_proc_info **ptr = &linked_proc_desc_table;;
+ for (; &ptr[0]->info != proc_desc; ptr = &ptr[0]->next )
+ if (ptr[0] == NULL) abort();
+ *ptr = ptr[0]->next;
+ free (ptr[0]);
+ write_register (HI_REGNUM, read_memory_integer(new_sp - 8, 4));
+ write_register (LO_REGNUM, read_memory_integer(new_sp - 12, 4));
+ write_register (FCRCS_REGNUM, read_memory_integer(new_sp - 16, 4));
+ }
+ write_register (PC_REGNUM, FRAME_SAVED_PC(frame));
+ if (frame->proc_desc) {
+ for (regnum = 32; --regnum >= 0; )
+ if (PROC_REG_MASK(proc_desc) & (1 << regnum))
+ write_register (regnum,
+ read_memory_integer (frame->saved_regs->regs[regnum], 4));
+ for (regnum = 64; --regnum >= 32; )
+ if (PROC_FREG_MASK(proc_desc) & (1 << regnum))
+ write_register (regnum,
+ read_memory_integer (frame->saved_regs->regs[regnum], 4));
+ }
+ write_register (SP_REGNUM, new_sp);
+ flush_cached_frames ();
+ set_current_frame (create_new_frame (new_sp, read_pc ()));
+}
+
+static mips_print_register(regnum, all)
+ int regnum, all;
+{
+ unsigned char raw_buffer[8];
+ REGISTER_TYPE val;
+
+ read_relative_register_raw_bytes (regnum, raw_buffer);
+
+ if (!(regnum & 1) && regnum >= FP0_REGNUM && regnum < FP0_REGNUM+32) {
+ read_relative_register_raw_bytes (regnum+1, raw_buffer+4);
+ printf_filtered ("(d%d: ", regnum&31);
+ val_print (builtin_type_double, raw_buffer, 0,
+ stdout, 0, 1, 0, Val_pretty_default);
+ printf_filtered ("); ", regnum&31);
+ }
+ fputs_filtered (reg_names[regnum], stdout);
+#ifndef NUMERIC_REG_NAMES
+ if (regnum < 32)
+ printf_filtered ("(r%d): ", regnum);
+ else
+#endif
+ printf_filtered (": ");
+
+ /* If virtual format is floating, print it that way. */
+ if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (regnum)) == TYPE_CODE_FLT
+ && ! INVALID_FLOAT (raw_buffer, REGISTER_VIRTUAL_SIZE(regnum))) {
+ val_print (REGISTER_VIRTUAL_TYPE (regnum), raw_buffer, 0,
+ stdout, 0, 1, 0, Val_pretty_default);
+ }
+ /* Else print as integer in hex. */
+ else
+ {
+ long val;
+
+ bcopy (raw_buffer, &val, sizeof (long));
+ if (val == 0)
+ printf_filtered ("0");
+ else if (all)
+ printf_filtered ("0x%x", val);
+ else
+ printf_filtered ("0x%x=%d", val, val);
+ }
+}
+
+mips_do_registers_info(regnum)
+ int regnum;
+{
+ if (regnum != -1) {
+ mips_print_register (regnum, 0);
+ printf_filtered ("\n");
+ }
+ else {
+ for (regnum = 0; regnum < NUM_REGS; ) {
+ mips_print_register (regnum, 1);
+ regnum++;
+ if ((regnum & 3) == 0 || regnum == NUM_REGS)
+ printf_filtered (";\n");
+ else
+ printf_filtered ("; ");
+ }
+ }
+}
+/* Return number of args passed to a frame. described by FIP.
+ Can return -1, meaning no way to tell. */
+
+mips_frame_num_args(fip)
+ FRAME fip;
+{
+#if 0
+ struct chain_info_t *p;
+
+ p = mips_find_cached_frame(FRAME_FP(fip));
+ if (p->valid)
+ return p->the_info.numargs;
+#endif
+ return -1;
+}
+
+
+/* Bad floats: Returns 0 if P points to a valid IEEE floating point number,
+ 1 if P points to a denormalized number or a NaN. LEN says whether this is
+ a single-precision or double-precision float */
+#define SINGLE_EXP_BITS 8
+#define DOUBLE_EXP_BITS 11
+int
+isa_NAN(p, len)
+ int *p, len;
+{
+ int exponent;
+ if (len == 4)
+ {
+ exponent = *p;
+ exponent = exponent << 1 >> (32 - SINGLE_EXP_BITS - 1);
+ return ((exponent == -1) || (! exponent && *p));
+ }
+ else if (len == 8)
+ {
+ exponent = *(p+1);
+ exponent = exponent << 1 >> (32 - DOUBLE_EXP_BITS - 1);
+ return ((exponent == -1) || (! exponent && *p * *(p+1)));
+ }
+ else return 1;
+}
+
+/* To skip prologues, I use this predicate. Returns either PC
+ itself if the code at PC does not look like a function prologue,
+ PC+4 if it does (our caller does not need anything more fancy). */
+
+CORE_ADDR mips_skip_prologue(pc)
+ CORE_ADDR pc;
+{
+ struct symbol *f;
+ struct block *b;
+ unsigned long inst;
+
+ /* For -g modules and most functions anyways the
+ first instruction adjusts the stack. */
+ inst = read_memory_integer(pc, 4);
+ if ((inst & 0xffff0000) == 0x27bd0000)
+ return pc + 4;
+
+ /* Well, it looks like a frameless. Let's make sure.
+ Note that we are not called on the current PC,
+ but on the function`s start PC, and I have definitely
+ seen optimized code that adjusts the SP quite later */
+ b = block_for_pc(pc);
+ if (!b) return pc;
+
+ f = lookup_symbol(".gdbinfo.", b, LABEL_NAMESPACE, 0, NULL);
+ if (!f) return pc;
+ /* Ideally, I would like to use the adjusted info
+ from mips_frame_info(), but for all practical
+ purposes it will not matter (and it would require
+ a different definition of SKIP_PROLOGUE())
+
+ Actually, it would not hurt to skip the storing
+ of arguments on the stack as well. */
+ if (((struct mips_extra_func_info *)f->value.value)->framesize)
+ return pc + 4;
+
+ return pc;
+}
generated by cgit v1.1 at 2024-12-15 06:20:59 +0000