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Add initial support for kgdb(1) on PowerPC.

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This commit is contained in:
Marcel Moolenaar 2006-08-24 21:53:49 +00:00
parent 512b2fb1b5
commit 8788b6eb7a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=161589
2 changed files with 186 additions and 5 deletions
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6
gnu/usr.bin/gdb/Makefile
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@ -1,9 +1,5 @@
# $FreeBSD$
SUBDIR= doc libgdb gdb gdbtui
.if ${MACHINE_ARCH} != "powerpc"
SUBDIR+= kgdb
.endif
SUBDIR= doc libgdb gdb gdbtui kgdb
.include <bsd.subdir.mk>

185
gnu/usr.bin/gdb/kgdb/trgt_powerpc.c Normal file
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@ -0,0 +1,185 @@
/*-
* Copyright (c) 2006 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 AUTHOR ``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 AUTHOR 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("$FreeBSD$");
#include <sys/types.h>
#include <machine/pcb.h>
#include <machine/frame.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 <ppc-tdep.h>
#include "kgdb.h"
void
kgdb_trgt_fetch_registers(int regno __unused)
{
struct kthr *kt;
struct pcb pcb;
struct gdbarch_tdep *tdep;
int i;
tdep = gdbarch_tdep (current_gdbarch);
kt = kgdb_thr_lookup_tid(ptid_get_tid(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));
}
/*
* r14-r31 are saved in the pcb
*/
for (i = 14; i <= 31; i++) {
supply_register(tdep->ppc_gp0_regnum + i,
(char *)&pcb.pcb_context[i]);
}
/* r1 is saved in the sp field */
supply_register(tdep->ppc_gp0_regnum + 1, (char *)&pcb.pcb_sp);
supply_register(tdep->ppc_lr_regnum, (char *)&pcb.pcb_lr);
supply_register(tdep->ppc_cr_regnum, (char *)&pcb.pcb_cr);
}
void
kgdb_trgt_store_registers(int regno __unused)
{
fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__);
}
struct kgdb_frame_cache {
CORE_ADDR pc;
CORE_ADDR sp;
};
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;
cache = *this_cache;
if (cache == NULL) {
cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_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));
}
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 gdbarch_tdep *tdep;
struct kgdb_frame_cache *cache;
int ofs, regsz;
tdep = gdbarch_tdep(current_gdbarch);
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;
if (regnum >= tdep->ppc_gp0_regnum &&
regnum <= tdep->ppc_gplast_regnum)
ofs = offsetof(struct trapframe,
fixreg[regnum - tdep->ppc_gp0_regnum]);
else if (regnum == tdep->ppc_lr_regnum)
ofs = offsetof(struct trapframe, lr);
else if (regnum == tdep->ppc_cr_regnum)
ofs = offsetof(struct trapframe, cr);
else if (regnum == tdep->ppc_xer_regnum)
ofs = offsetof(struct trapframe, xer);
else if (regnum == tdep->ppc_ctr_regnum)
ofs = offsetof(struct trapframe, ctr);
else if (regnum == PC_REGNUM)
ofs = offsetof(struct trapframe, srr0);
else
return;
cache = kgdb_trgt_frame_cache(next_frame, this_cache);
*addrp = cache->sp + 8 + 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, "asttrapexit") == 0 ||
strcmp(pname, "trapexit") == 0)
return (&kgdb_trgt_trapframe_unwind);
/* printf("%s: %llx =%s\n", __func__, pc, pname); */
return (NULL);
}