/* 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"
/* 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
hp_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 */
hp_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. */
int
hp_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
hp_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++)
{
cum += TYPE_LENGTH (VALUE_TYPE (args[i]));
/* value must go at proper alignment. Assume alignment is a
power of two.*/
alignment = hp_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;
}
/* return the alignment of a type in bytes. Structures have the maximum
alignment required by their fields. */
int
hp_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 hp_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 = hp_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);
}