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binutils-gdb/gdb/aarch64-linux-tdep.c

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/* 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;
linux_init_abi (info, gdbarch);
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);
}
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