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/*-
* 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 "defs.h"
#include "frame-unwind.h"
#include "gdbcore.h"
#include "osabi.h"
#include "regcache.h"
#include "solib.h"
#include "symtab.h"
#include "trad-frame.h"
#include "ppc-tdep.h"
#include "ppc64-tdep.h"
#ifdef __powerpc__
#include <machine/pcb.h>
#include <machine/frame.h>
#endif
#include "kgdb.h"
#define PCB_OFF_R12 0
#define PCB_OFF_CR 20
#define PCB_OFF_SP 21
#define PCB_OFF_TOC 22
#define PCB_OFF_LR 23
#ifdef __powerpc__
_Static_assert(offsetof(struct pcb, pcb_context)
== PCB_OFF_R12 * sizeof(register_t), "r12 offset");
_Static_assert(offsetof(struct pcb, pcb_cr) == PCB_OFF_CR * sizeof(register_t),
"cr offset");
_Static_assert(offsetof(struct pcb, pcb_sp) == PCB_OFF_SP * sizeof(register_t),
"sp offset");
_Static_assert(offsetof(struct pcb, pcb_toc) == PCB_OFF_TOC * sizeof(register_t),
"toc offset");
_Static_assert(offsetof(struct pcb, pcb_lr) == PCB_OFF_LR * sizeof(register_t),
"lr offset");
#endif
static void
ppcfbsd_supply_pcb(struct regcache *regcache, CORE_ADDR pcb_addr)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ());
gdb_byte buf[24 * tdep->wordsize];
int i;
/* Always give a value for PC in case the PCB isn't readable. */
regcache->raw_supply_zeroed (PPC_PC_REGNUM);
if (target_read_memory (pcb_addr, buf, sizeof buf) != 0)
return;
/* r12 - r31 */
for (i = 0; i < 20; i++)
regcache->raw_supply (tdep->ppc_gp0_regnum + 12 + i,
buf + tdep->wordsize * i);
/* r1 is saved in the sp field */
regcache->raw_supply (tdep->ppc_gp0_regnum + 1,
buf + tdep->wordsize * PCB_OFF_SP);
if (tdep->wordsize == 8)
/* r2 is saved in the toc field */
regcache->raw_supply (tdep->ppc_gp0_regnum + 2,
buf + tdep->wordsize * PCB_OFF_TOC);
regcache->raw_supply (tdep->ppc_lr_regnum, buf + tdep->wordsize * PCB_OFF_LR);
regcache->raw_supply (PPC_PC_REGNUM, buf + tdep->wordsize * PCB_OFF_LR);
regcache->raw_supply (tdep->ppc_cr_regnum, buf + tdep->wordsize * PCB_OFF_CR);
}
#define OFF_FIXREG 0
#define OFF_LR 32
#define OFF_CR 33
#define OFF_XER 34
#define OFF_CTR 35
#define OFF_SRR0 36
#define TRAPFRAME_SIZE 42
#ifdef __powerpc__
_Static_assert(sizeof(struct trapframe) == TRAPFRAME_SIZE * sizeof(register_t),
"trapframe size");
_Static_assert(offsetof(struct trapframe, fixreg)
== OFF_FIXREG * sizeof(register_t), "fixreg offset");
_Static_assert(offsetof(struct trapframe, lr) == OFF_LR * sizeof(register_t),
"lr offset");
_Static_assert(offsetof(struct trapframe, cr) == OFF_CR * sizeof(register_t),
"cr offset");
_Static_assert(offsetof(struct trapframe, xer) == OFF_XER * sizeof(register_t),
"xer offset");
_Static_assert(offsetof(struct trapframe, ctr) == OFF_CTR * sizeof(register_t),
"ctr offset");
_Static_assert(offsetof(struct trapframe, srr0)
== OFF_SRR0 * sizeof(register_t), "srr0 offset");
#endif
static struct trad_frame_cache *
ppcfbsd_trapframe_cache (struct frame_info *this_frame, void **this_cache)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
struct trad_frame_cache *cache;
CORE_ADDR base;
int i;
if (*this_cache)
return (struct trad_frame_cache *)*this_cache;
cache = trad_frame_cache_zalloc (this_frame);
*this_cache = cache;
base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
if (tdep->wordsize == 8)
base += 48;
else
base += 8;
for (i = 0; i < ppc_num_gprs; i++)
trad_frame_set_reg_addr (cache, tdep->ppc_gp0_regnum + i, base
+ (OFF_FIXREG + i) * tdep->wordsize);
trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, base
+ OFF_LR * tdep->wordsize);
trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, base
+ OFF_CR * tdep->wordsize);
trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, base
+ OFF_XER * tdep->wordsize);
trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, base
+ OFF_CTR * tdep->wordsize);
/* SRR0? */
trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), base
+ OFF_SRR0 * tdep->wordsize);
/* Construct the frame ID using the function start. */
trad_frame_set_id (cache, frame_id_build (base, get_frame_func (this_frame)));
return cache;
}
static void
ppcfbsd_trapframe_this_id (struct frame_info *this_frame,
void **this_cache, struct frame_id *this_id)
{
struct trad_frame_cache *cache =
ppcfbsd_trapframe_cache (this_frame, this_cache);
trad_frame_get_id (cache, this_id);
}
static struct value *
ppcfbsd_trapframe_prev_register (struct frame_info *this_frame,
void **this_cache, int regnum)
{
struct trad_frame_cache *cache =
ppcfbsd_trapframe_cache (this_frame, this_cache);
return trad_frame_get_register (cache, this_frame, regnum);
}
static int
ppcfbsd_trapframe_sniffer (const struct frame_unwind *self,
struct frame_info *this_frame,
void **this_cache)
{
CORE_ADDR pc;
const char *name;
pc = get_frame_func (this_frame);
find_pc_partial_function (pc, &name, NULL, NULL);
if (name && (strcmp(name, "trapagain") == 0
|| strcmp(name, "trapexit") == 0
|| strcmp(name, "dbtrap") == 0))
return 1;
return 0;
}
static const struct frame_unwind ppcfbsd_trapframe_unwind =
{
SIGTRAMP_FRAME,
default_frame_unwind_stop_reason,
ppcfbsd_trapframe_this_id,
ppcfbsd_trapframe_prev_register,
NULL,
ppcfbsd_trapframe_sniffer
};
static void
ppcfbsd_kernel_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
frame_unwind_prepend_unwinder(gdbarch, &ppcfbsd_trapframe_unwind);
set_solib_ops(gdbarch, &kld_so_ops);
fbsd_vmcore_set_supply_pcb(gdbarch, ppcfbsd_supply_pcb);
fbsd_vmcore_set_cpu_pcb_addr(gdbarch, kgdb_trgt_stop_pcb);
/* FreeBSD doesn't support the 128-bit `long double' from the psABI. */
set_gdbarch_long_double_bit (gdbarch, 64);
set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
if (tdep->wordsize == 4)
{
set_gdbarch_return_value (gdbarch, ppc_sysv_abi_broken_return_value);
}
if (tdep->wordsize == 8)
{
set_gdbarch_convert_from_func_ptr_addr
(gdbarch, ppc64_convert_from_func_ptr_addr);
set_gdbarch_elf_make_msymbol_special (gdbarch,
ppc64_elf_make_msymbol_special);
}
}
void _initialize_ppc_kgdb_tdep(void);
void
_initialize_ppc_kgdb_tdep(void)
{
gdbarch_register_osabi_sniffer(bfd_arch_powerpc,
bfd_target_elf_flavour,
fbsd_kernel_osabi_sniffer);
gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc,
GDB_OSABI_FREEBSD_KERNEL, ppcfbsd_kernel_init_abi);
gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64,
GDB_OSABI_FREEBSD_KERNEL, ppcfbsd_kernel_init_abi);
/* Not sure about this one. */
gdbarch_register_osabi_sniffer(bfd_arch_rs6000,
bfd_target_elf_flavour,
fbsd_kernel_osabi_sniffer);
gdbarch_register_osabi (bfd_arch_rs6000, 0,
GDB_OSABI_FREEBSD_KERNEL, ppcfbsd_kernel_init_abi);
}
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