b5dbc8d429
2013-02-08 Yufeng Zhang <yufeng.zhang@arm.com> * aarch64-linux-tdep.c (AARCH64_LINUX_SIZEOF_GREGSET): Change the number of the registers from 36 to 34.
302 lines
8.4 KiB
C
302 lines
8.4 KiB
C
/* Target-dependent code for GNU/Linux AArch64.
|
|
|
|
Copyright (C) 2009-2013 Free Software Foundation, Inc.
|
|
Contributed by ARM Ltd.
|
|
|
|
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 3 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, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "defs.h"
|
|
|
|
#include "gdbarch.h"
|
|
#include "glibc-tdep.h"
|
|
#include "linux-tdep.h"
|
|
#include "aarch64-tdep.h"
|
|
#include "aarch64-linux-tdep.h"
|
|
#include "osabi.h"
|
|
#include "solib-svr4.h"
|
|
#include "symtab.h"
|
|
#include "tramp-frame.h"
|
|
#include "trad-frame.h"
|
|
|
|
#include "inferior.h"
|
|
#include "regcache.h"
|
|
#include "regset.h"
|
|
|
|
/* The general-purpose regset consists of 31 X registers, plus SP, PC,
|
|
and PSTATE registers, as defined in the AArch64 port of the Linux
|
|
kernel. */
|
|
#define AARCH64_LINUX_SIZEOF_GREGSET (34 * X_REGISTER_SIZE)
|
|
|
|
/* The fp regset consists of 32 V registers, plus FPCR and FPSR which
|
|
are 4 bytes wide each, and the whole structure is padded to 128 bit
|
|
alignment. */
|
|
#define AARCH64_LINUX_SIZEOF_FPREGSET (33 * V_REGISTER_SIZE)
|
|
|
|
/* Signal frame handling.
|
|
|
|
+----------+ ^
|
|
| saved lr | |
|
|
+->| saved fp |--+
|
|
| | |
|
|
| | |
|
|
| +----------+
|
|
| | saved lr |
|
|
+--| saved fp |
|
|
^ | |
|
|
| | |
|
|
| +----------+
|
|
^ | |
|
|
| | signal |
|
|
| | |
|
|
| | saved lr |-->interrupted_function_pc
|
|
+--| saved fp |
|
|
| +----------+
|
|
| | saved lr |--> default_restorer (movz x8, NR_sys_rt_sigreturn; svc 0)
|
|
+--| saved fp |<- FP
|
|
| |
|
|
| |<- SP
|
|
+----------+
|
|
|
|
On signal delivery, the kernel will create a signal handler stack
|
|
frame and setup the return address in LR to point at restorer stub.
|
|
The signal stack frame is defined by:
|
|
|
|
struct rt_sigframe
|
|
{
|
|
siginfo_t info;
|
|
struct ucontext uc;
|
|
};
|
|
|
|
typedef struct
|
|
{
|
|
... 128 bytes
|
|
} siginfo_t;
|
|
|
|
The ucontext has the following form:
|
|
struct ucontext
|
|
{
|
|
unsigned long uc_flags;
|
|
struct ucontext *uc_link;
|
|
stack_t uc_stack;
|
|
sigset_t uc_sigmask;
|
|
struct sigcontext uc_mcontext;
|
|
};
|
|
|
|
typedef struct sigaltstack
|
|
{
|
|
void *ss_sp;
|
|
int ss_flags;
|
|
size_t ss_size;
|
|
} stack_t;
|
|
|
|
struct sigcontext
|
|
{
|
|
unsigned long fault_address;
|
|
unsigned long regs[31];
|
|
unsigned long sp; / * 31 * /
|
|
unsigned long pc; / * 32 * /
|
|
unsigned long pstate; / * 33 * /
|
|
__u8 __reserved[4096]
|
|
};
|
|
|
|
The restorer stub will always have the form:
|
|
|
|
d28015a8 movz x8, #0xad
|
|
d4000001 svc #0x0
|
|
|
|
We detect signal frames by snooping the return code for the restorer
|
|
instruction sequence.
|
|
|
|
The handler then needs to recover the saved register set from
|
|
ucontext.uc_mcontext. */
|
|
|
|
/* These magic numbers need to reflect the layout of the kernel
|
|
defined struct rt_sigframe and ucontext. */
|
|
#define AARCH64_SIGCONTEXT_REG_SIZE 8
|
|
#define AARCH64_RT_SIGFRAME_UCONTEXT_OFFSET 128
|
|
#define AARCH64_UCONTEXT_SIGCONTEXT_OFFSET 176
|
|
#define AARCH64_SIGCONTEXT_XO_OFFSET 8
|
|
|
|
/* Implement the "init" method of struct tramp_frame. */
|
|
|
|
static void
|
|
aarch64_linux_sigframe_init (const struct tramp_frame *self,
|
|
struct frame_info *this_frame,
|
|
struct trad_frame_cache *this_cache,
|
|
CORE_ADDR func)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
CORE_ADDR sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM);
|
|
CORE_ADDR fp = get_frame_register_unsigned (this_frame, AARCH64_FP_REGNUM);
|
|
CORE_ADDR sigcontext_addr =
|
|
sp
|
|
+ AARCH64_RT_SIGFRAME_UCONTEXT_OFFSET
|
|
+ AARCH64_UCONTEXT_SIGCONTEXT_OFFSET;
|
|
int i;
|
|
|
|
for (i = 0; i < 31; i++)
|
|
{
|
|
trad_frame_set_reg_addr (this_cache,
|
|
AARCH64_X0_REGNUM + i,
|
|
sigcontext_addr + AARCH64_SIGCONTEXT_XO_OFFSET
|
|
+ i * AARCH64_SIGCONTEXT_REG_SIZE);
|
|
}
|
|
|
|
trad_frame_set_reg_addr (this_cache, AARCH64_FP_REGNUM, fp);
|
|
trad_frame_set_reg_addr (this_cache, AARCH64_LR_REGNUM, fp + 8);
|
|
trad_frame_set_reg_addr (this_cache, AARCH64_PC_REGNUM, fp + 8);
|
|
|
|
trad_frame_set_id (this_cache, frame_id_build (fp, func));
|
|
}
|
|
|
|
static const struct tramp_frame aarch64_linux_rt_sigframe =
|
|
{
|
|
SIGTRAMP_FRAME,
|
|
4,
|
|
{
|
|
/* movz x8, 0x8b (S=1,o=10,h=0,i=0x8b,r=8)
|
|
Soo1 0010 1hhi iiii iiii iiii iiir rrrr */
|
|
{0xd2801168, -1},
|
|
|
|
/* svc 0x0 (o=0, l=1)
|
|
1101 0100 oooi iiii iiii iiii iii0 00ll */
|
|
{0xd4000001, -1},
|
|
{TRAMP_SENTINEL_INSN, -1}
|
|
},
|
|
aarch64_linux_sigframe_init
|
|
};
|
|
|
|
/* Fill GDB's register array with the general-purpose register values
|
|
in the buffer pointed by GREGS_BUF. */
|
|
|
|
void
|
|
aarch64_linux_supply_gregset (struct regcache *regcache,
|
|
const gdb_byte *gregs_buf)
|
|
{
|
|
int regno;
|
|
|
|
for (regno = AARCH64_X0_REGNUM; regno <= AARCH64_CPSR_REGNUM; regno++)
|
|
regcache_raw_supply (regcache, regno,
|
|
gregs_buf + X_REGISTER_SIZE
|
|
* (regno - AARCH64_X0_REGNUM));
|
|
}
|
|
|
|
/* The "supply_regset" function for the general-purpose register set. */
|
|
|
|
static void
|
|
supply_gregset_from_core (const struct regset *regset,
|
|
struct regcache *regcache,
|
|
int regnum, const void *regbuf, size_t len)
|
|
{
|
|
aarch64_linux_supply_gregset (regcache, (const gdb_byte *) regbuf);
|
|
}
|
|
|
|
/* Fill GDB's register array with the floating-point register values
|
|
in the buffer pointed by FPREGS_BUF. */
|
|
|
|
void
|
|
aarch64_linux_supply_fpregset (struct regcache *regcache,
|
|
const gdb_byte *fpregs_buf)
|
|
{
|
|
int regno;
|
|
|
|
for (regno = AARCH64_V0_REGNUM; regno <= AARCH64_V31_REGNUM; regno++)
|
|
regcache_raw_supply (regcache, regno,
|
|
fpregs_buf + V_REGISTER_SIZE
|
|
* (regno - AARCH64_V0_REGNUM));
|
|
|
|
regcache_raw_supply (regcache, AARCH64_FPSR_REGNUM,
|
|
fpregs_buf + V_REGISTER_SIZE * 32);
|
|
regcache_raw_supply (regcache, AARCH64_FPCR_REGNUM,
|
|
fpregs_buf + V_REGISTER_SIZE * 32 + 4);
|
|
}
|
|
|
|
/* The "supply_regset" function for the floating-point register set. */
|
|
|
|
static void
|
|
supply_fpregset_from_core (const struct regset *regset,
|
|
struct regcache *regcache,
|
|
int regnum, const void *regbuf, size_t len)
|
|
{
|
|
aarch64_linux_supply_fpregset (regcache, (const gdb_byte *) regbuf);
|
|
}
|
|
|
|
/* Implement the "regset_from_core_section" gdbarch method. */
|
|
|
|
static const struct regset *
|
|
aarch64_linux_regset_from_core_section (struct gdbarch *gdbarch,
|
|
const char *sect_name,
|
|
size_t sect_size)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
if (strcmp (sect_name, ".reg") == 0
|
|
&& sect_size == AARCH64_LINUX_SIZEOF_GREGSET)
|
|
{
|
|
if (tdep->gregset == NULL)
|
|
tdep->gregset = regset_alloc (gdbarch, supply_gregset_from_core,
|
|
NULL);
|
|
return tdep->gregset;
|
|
}
|
|
|
|
if (strcmp (sect_name, ".reg2") == 0
|
|
&& sect_size == AARCH64_LINUX_SIZEOF_FPREGSET)
|
|
{
|
|
if (tdep->fpregset == NULL)
|
|
tdep->fpregset = regset_alloc (gdbarch, supply_fpregset_from_core,
|
|
NULL);
|
|
return tdep->fpregset;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
aarch64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
tdep->lowest_pc = 0x8000;
|
|
|
|
set_solib_svr4_fetch_link_map_offsets (gdbarch,
|
|
svr4_lp64_fetch_link_map_offsets);
|
|
|
|
/* Enable TLS support. */
|
|
set_gdbarch_fetch_tls_load_module_address (gdbarch,
|
|
svr4_fetch_objfile_link_map);
|
|
|
|
/* Shared library handling. */
|
|
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
|
|
|
|
set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);
|
|
tramp_frame_prepend_unwinder (gdbarch, &aarch64_linux_rt_sigframe);
|
|
|
|
/* Enable longjmp. */
|
|
tdep->jb_pc = 11;
|
|
|
|
set_gdbarch_regset_from_core_section (gdbarch,
|
|
aarch64_linux_regset_from_core_section);
|
|
}
|
|
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
|
extern initialize_file_ftype _initialize_aarch64_linux_tdep;
|
|
|
|
void
|
|
_initialize_aarch64_linux_tdep (void)
|
|
{
|
|
gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_LINUX,
|
|
aarch64_linux_init_abi);
|
|
}
|