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Diffstat (limited to 'gdb/hppah-tdep.c')
| -rw-r--r-- | gdb/hppah-tdep.c | 938 |
1 files changed, 0 insertions, 938 deletions
diff --git a/gdb/hppah-tdep.c b/gdb/hppah-tdep.c index cd0d157..e69de29 100644 --- a/gdb/hppah-tdep.c +++ b/gdb/hppah-tdep.c @@ -1,938 +0,0 @@ -/* 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 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 <sys/types.h> -#endif - -#include <sys/param.h> -#include <sys/dir.h> -#include <signal.h> -#include <sys/ioctl.h> - -#ifdef COFF_ENCAPSULATE -#include "a.out.encap.h" -#else -#include <a.out.h> -#endif -#ifndef N_SET_MAGIC -#define N_SET_MAGIC(exec, val) ((exec).a_magic = (val)) -#endif - -/*#include <sys/user.h> After a.out.h */ -#include <sys/file.h> -#include <sys/stat.h> -#include <machine/psl.h> -#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)); - - -/* 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 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; - - 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; -} - -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_look_for_prologue (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_look_for_prologue (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; - - msym = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe)); - - if (msym - && (strcmp (SYMBOL_NAME (msym), "_start") == 0)) - return 0; - else - return 1; -} - -#if 0 -/* Some helper functions. gcc_p returns 1 if the function beginning at - pc appears to have been compiled with gcc. hpux_cc_p returns 1 if - fn was compiled with hpux cc. gcc functions look like : - - stw rp,-0x14(sp) ; optional - or r4,r0,r1 - or sp,r0,r4 - stwm r1,framesize(sp) - - hpux cc functions look like: - - stw rp,-0x14(sp) ; optional. - stwm r3,framesiz(sp) - */ - -gcc_p (pc) - CORE_ADDR pc; -{ - if (read_memory_integer (pc, 4) == 0x6BC23FD9) - pc = pc + 4; - - if (read_memory_integer (pc, 4) == 0x8040241 - && read_memory_integer (pc + 4, 4) == 0x81E0244) - return 1; - return 0; -} -#endif - -/* - * 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; - frame_saved_regs->regs[3] = fp + 12; - - for (fp += 16, i = 5; i < 32; fp += 4, i++) - frame_saved_regs->regs[i] = fp; - - 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; - fp += 4; - frame_saved_regs->regs[SAR_REGNUM] = fp; - fp += 4; - frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp; - fp +=4; - frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp; - fp +=4; - frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp; - fp +=4; - frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp; -} - -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); - 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 += min ((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; -{ - int inst; - int status; - - status = target_read_memory (pc, (char *)&inst, 4); - SWAP_TARGET_AND_HOST (&inst, sizeof (inst)); - 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_hppah_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); -} |