| Current Path : /usr/src/gnu/usr.bin/gdb/kgdb/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/gnu/usr.bin/gdb/kgdb/trgt_i386.c |
/*
* Copyright (c) 2004 Marcel Moolenaar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/gnu/usr.bin/gdb/kgdb/trgt_i386.c 210852 2010-08-04 21:02:04Z jhb $");
#include <sys/param.h>
#include <sys/proc.h>
#include <machine/pcb.h>
#include <machine/frame.h>
#include <machine/segments.h>
#include <machine/tss.h>
#include <err.h>
#include <kvm.h>
#include <string.h>
#include <defs.h>
#include <target.h>
#include <gdbthread.h>
#include <inferior.h>
#include <regcache.h>
#include <frame-unwind.h>
#include <i386-tdep.h>
#include "kgdb.h"
static int ofs_fix;
void
kgdb_trgt_fetch_registers(int regno __unused)
{
struct kthr *kt;
struct pcb pcb;
kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid));
if (kt == NULL)
return;
if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) {
warnx("kvm_read: %s", kvm_geterr(kvm));
memset(&pcb, 0, sizeof(pcb));
}
supply_register(I386_EBX_REGNUM, (char *)&pcb.pcb_ebx);
supply_register(I386_ESP_REGNUM, (char *)&pcb.pcb_esp);
supply_register(I386_EBP_REGNUM, (char *)&pcb.pcb_ebp);
supply_register(I386_ESI_REGNUM, (char *)&pcb.pcb_esi);
supply_register(I386_EDI_REGNUM, (char *)&pcb.pcb_edi);
supply_register(I386_EIP_REGNUM, (char *)&pcb.pcb_eip);
}
void
kgdb_trgt_store_registers(int regno __unused)
{
fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__);
}
void
kgdb_trgt_new_objfile(struct objfile *objfile)
{
/*
* In revision 1.117 of i386/i386/exception.S trap handlers
* were changed to pass trapframes by reference rather than
* by value. Detect this by seeing if the first instruction
* at the 'calltrap' label is a "push %esp" which has the
* opcode 0x54.
*/
if (kgdb_parse("((char *)calltrap)[0]") == 0x54)
ofs_fix = 4;
else
ofs_fix = 0;
}
struct kgdb_tss_cache {
CORE_ADDR pc;
CORE_ADDR sp;
CORE_ADDR tss;
};
static int kgdb_trgt_tss_offset[15] = {
offsetof(struct i386tss, tss_eax),
offsetof(struct i386tss, tss_ecx),
offsetof(struct i386tss, tss_edx),
offsetof(struct i386tss, tss_ebx),
offsetof(struct i386tss, tss_esp),
offsetof(struct i386tss, tss_ebp),
offsetof(struct i386tss, tss_esi),
offsetof(struct i386tss, tss_edi),
offsetof(struct i386tss, tss_eip),
offsetof(struct i386tss, tss_eflags),
offsetof(struct i386tss, tss_cs),
offsetof(struct i386tss, tss_ss),
offsetof(struct i386tss, tss_ds),
offsetof(struct i386tss, tss_es),
offsetof(struct i386tss, tss_fs)
};
/*
* If the current thread is executing on a CPU, fetch the common_tss
* for that CPU.
*
* This is painful because 'struct pcpu' is variant sized, so we can't
* use it. Instead, we lookup the GDT selector for this CPU and
* extract the base of the TSS from there.
*/
static CORE_ADDR
kgdb_trgt_fetch_tss(void)
{
struct kthr *kt;
struct segment_descriptor sd;
uintptr_t addr, cpu0prvpage, tss;
kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid));
if (kt == NULL || kt->cpu == NOCPU)
return (0);
addr = kgdb_lookup("gdt");
if (addr == 0)
return (0);
addr += (kt->cpu * NGDT + GPROC0_SEL) * sizeof(sd);
if (kvm_read(kvm, addr, &sd, sizeof(sd)) != sizeof(sd)) {
warnx("kvm_read: %s", kvm_geterr(kvm));
return (0);
}
if (sd.sd_type != SDT_SYS386BSY) {
warnx("descriptor is not a busy TSS");
return (0);
}
tss = sd.sd_hibase << 24 | sd.sd_lobase;
/*
* In SMP kernels, the TSS is stored as part of the per-CPU
* data. On older kernels, the CPU0's private page
* is stored at an address that isn't mapped in minidumps.
* However, the data is mapped at the alternate cpu0prvpage
* address. Thus, if the TSS is at the invalid address,
* change it to be relative to cpu0prvpage instead.
*/
if (trunc_page(tss) == 0xffc00000) {
addr = kgdb_lookup("cpu0prvpage");
if (addr == 0)
return (0);
if (kvm_read(kvm, addr, &cpu0prvpage, sizeof(cpu0prvpage)) !=
sizeof(cpu0prvpage)) {
warnx("kvm_read: %s", kvm_geterr(kvm));
return (0);
}
tss = cpu0prvpage + (tss & PAGE_MASK);
}
return ((CORE_ADDR)tss);
}
static struct kgdb_tss_cache *
kgdb_trgt_tss_cache(struct frame_info *next_frame, void **this_cache)
{
char buf[MAX_REGISTER_SIZE];
struct kgdb_tss_cache *cache;
cache = *this_cache;
if (cache == NULL) {
cache = FRAME_OBSTACK_ZALLOC(struct kgdb_tss_cache);
*this_cache = cache;
cache->pc = frame_func_unwind(next_frame);
frame_unwind_register(next_frame, SP_REGNUM, buf);
cache->sp = extract_unsigned_integer(buf,
register_size(current_gdbarch, SP_REGNUM));
cache->tss = kgdb_trgt_fetch_tss();
}
return (cache);
}
static void
kgdb_trgt_dblfault_this_id(struct frame_info *next_frame, void **this_cache,
struct frame_id *this_id)
{
struct kgdb_tss_cache *cache;
cache = kgdb_trgt_tss_cache(next_frame, this_cache);
*this_id = frame_id_build(cache->sp, cache->pc);
}
static void
kgdb_trgt_dblfault_prev_register(struct frame_info *next_frame,
void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp,
CORE_ADDR *addrp, int *realnump, void *valuep)
{
char dummy_valuep[MAX_REGISTER_SIZE];
struct kgdb_tss_cache *cache;
int ofs, regsz;
regsz = register_size(current_gdbarch, regnum);
if (valuep == NULL)
valuep = dummy_valuep;
memset(valuep, 0, regsz);
*optimizedp = 0;
*addrp = 0;
*lvalp = not_lval;
*realnump = -1;
ofs = (regnum >= I386_EAX_REGNUM && regnum <= I386_FS_REGNUM)
? kgdb_trgt_tss_offset[regnum] : -1;
if (ofs == -1)
return;
cache = kgdb_trgt_tss_cache(next_frame, this_cache);
if (cache->tss == 0)
return;
*addrp = cache->tss + ofs;
*lvalp = lval_memory;
target_read_memory(*addrp, valuep, regsz);
}
static const struct frame_unwind kgdb_trgt_dblfault_unwind = {
UNKNOWN_FRAME,
&kgdb_trgt_dblfault_this_id,
&kgdb_trgt_dblfault_prev_register
};
struct kgdb_frame_cache {
int frame_type;
CORE_ADDR pc;
CORE_ADDR sp;
};
#define FT_NORMAL 1
#define FT_INTRFRAME 2
#define FT_INTRTRAPFRAME 3
#define FT_TIMERFRAME 4
static int kgdb_trgt_frame_offset[15] = {
offsetof(struct trapframe, tf_eax),
offsetof(struct trapframe, tf_ecx),
offsetof(struct trapframe, tf_edx),
offsetof(struct trapframe, tf_ebx),
offsetof(struct trapframe, tf_esp),
offsetof(struct trapframe, tf_ebp),
offsetof(struct trapframe, tf_esi),
offsetof(struct trapframe, tf_edi),
offsetof(struct trapframe, tf_eip),
offsetof(struct trapframe, tf_eflags),
offsetof(struct trapframe, tf_cs),
offsetof(struct trapframe, tf_ss),
offsetof(struct trapframe, tf_ds),
offsetof(struct trapframe, tf_es),
offsetof(struct trapframe, tf_fs)
};
static struct kgdb_frame_cache *
kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache)
{
char buf[MAX_REGISTER_SIZE];
struct kgdb_frame_cache *cache;
char *pname;
cache = *this_cache;
if (cache == NULL) {
cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache);
*this_cache = cache;
cache->pc = frame_func_unwind(next_frame);
find_pc_partial_function(cache->pc, &pname, NULL, NULL);
if (pname[0] != 'X')
cache->frame_type = FT_NORMAL;
else if (strcmp(pname, "Xtimerint") == 0)
cache->frame_type = FT_TIMERFRAME;
else if (strcmp(pname, "Xcpustop") == 0 ||
strcmp(pname, "Xrendezvous") == 0 ||
strcmp(pname, "Xipi_intr_bitmap_handler") == 0 ||
strcmp(pname, "Xlazypmap") == 0)
cache->frame_type = FT_INTRTRAPFRAME;
else
cache->frame_type = FT_INTRFRAME;
frame_unwind_register(next_frame, SP_REGNUM, buf);
cache->sp = extract_unsigned_integer(buf,
register_size(current_gdbarch, SP_REGNUM));
}
return (cache);
}
static void
kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache,
struct frame_id *this_id)
{
struct kgdb_frame_cache *cache;
cache = kgdb_trgt_frame_cache(next_frame, this_cache);
*this_id = frame_id_build(cache->sp, cache->pc);
}
static void
kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame,
void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp,
CORE_ADDR *addrp, int *realnump, void *valuep)
{
char dummy_valuep[MAX_REGISTER_SIZE];
struct kgdb_frame_cache *cache;
int ofs, regsz;
regsz = register_size(current_gdbarch, regnum);
if (valuep == NULL)
valuep = dummy_valuep;
memset(valuep, 0, regsz);
*optimizedp = 0;
*addrp = 0;
*lvalp = not_lval;
*realnump = -1;
ofs = (regnum >= I386_EAX_REGNUM && regnum <= I386_FS_REGNUM)
? kgdb_trgt_frame_offset[regnum] + ofs_fix : -1;
if (ofs == -1)
return;
cache = kgdb_trgt_frame_cache(next_frame, this_cache);
switch (cache->frame_type) {
case FT_NORMAL:
break;
case FT_INTRFRAME:
ofs += 4;
break;
case FT_TIMERFRAME:
break;
case FT_INTRTRAPFRAME:
ofs -= ofs_fix;
break;
default:
fprintf_unfiltered(gdb_stderr, "Correct FT_XXX frame offsets "
"for %d\n", cache->frame_type);
break;
}
*addrp = cache->sp + ofs;
*lvalp = lval_memory;
target_read_memory(*addrp, valuep, regsz);
}
static const struct frame_unwind kgdb_trgt_trapframe_unwind = {
UNKNOWN_FRAME,
&kgdb_trgt_trapframe_this_id,
&kgdb_trgt_trapframe_prev_register
};
const struct frame_unwind *
kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame)
{
char *pname;
CORE_ADDR pc;
pc = frame_pc_unwind(next_frame);
pname = NULL;
find_pc_partial_function(pc, &pname, NULL, NULL);
if (pname == NULL)
return (NULL);
if (strcmp(pname, "dblfault_handler") == 0)
return (&kgdb_trgt_dblfault_unwind);
if (strcmp(pname, "calltrap") == 0 ||
(pname[0] == 'X' && pname[1] != '_'))
return (&kgdb_trgt_trapframe_unwind);
/* printf("%s: %llx =%s\n", __func__, pc, pname); */
return (NULL);
}