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/* Target-dependent code for GNU/Linux on OpenRISC processors.
Copyright (C) 2018-2020 Free Software Foundation, Inc.
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 "or1k-tdep.h"
#include "osabi.h"
#include "glibc-tdep.h"
#include "linux-tdep.h"
#include "solib-svr4.h"
#include "regset.h"
#include "tramp-frame.h"
#include "trad-frame.h"
#include "gdbarch.h"
/* Define the general register mapping. The kernel puts the PC at offset 0,
gdb puts it at offset 32. Register x0 is always 0 and can be ignored.
Registers x1 to x31 are in the same place. */
static const struct regcache_map_entry or1k_linux_gregmap[] =
{
{ 32, OR1K_ZERO_REGNUM, 4 }, /* r0 to r31 */
{ 1, OR1K_NPC_REGNUM, 4 },
{ 0 }
};
/* Define the general register regset. */
static const struct regset or1k_linux_gregset =
{
or1k_linux_gregmap, regcache_supply_regset, regcache_collect_regset
};
/* Define hook for core file support. */
static void
or1k_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
iterate_over_regset_sections_cb *cb,
void *cb_data,
const struct regcache *regcache)
{
cb (".reg", (33 * 4), (33 * 4), &or1k_linux_gregset, NULL, cb_data);
}
/* Signal trampoline support. */
static void or1k_linux_sigframe_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func);
#define OR1K_RT_SIGRETURN 139
#define OR1K_INST_L_ORI_R11_R0_IMM 0xa9600000
#define OR1K_INST_L_SYS_1 0x20000001
#define OR1K_INST_L_NOP 0x15000000
static const struct tramp_frame or1k_linux_sigframe = {
SIGTRAMP_FRAME,
4,
{
{ OR1K_INST_L_ORI_R11_R0_IMM | OR1K_RT_SIGRETURN, ULONGEST_MAX },
{ OR1K_INST_L_SYS_1, ULONGEST_MAX },
{ OR1K_INST_L_NOP, ULONGEST_MAX },
{ TRAMP_SENTINEL_INSN }
},
or1k_linux_sigframe_init,
NULL
};
/* Runtime signal frames look like this:
struct rt_sigframe {
struct siginfo info;
struct ucontext uc;
unsigned char retcode[16];
};
struct ucontext {
unsigned long uc_flags; - 4
struct ucontext *uc_link; - 4
stack_t uc_stack; - 4 * 3
struct sigcontext uc_mcontext;
sigset_t uc_sigmask;
};
struct sigcontext {
struct user_regs_struct regs;
unsigned long oldmask;
};
struct user_regs_struct {
unsigned long gpr[32];
unsigned long pc;
unsigned long sr;
}; */
#define SIGFRAME_SIGINFO_SIZE 128
#define UCONTEXT_MCONTEXT_OFFSET 20
static void
or1k_linux_sigframe_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
CORE_ADDR frame_sp = get_frame_sp (this_frame);
CORE_ADDR mcontext_base;
CORE_ADDR regs_base;
mcontext_base = frame_sp + SIGFRAME_SIGINFO_SIZE + UCONTEXT_MCONTEXT_OFFSET;
/* Handle the general registers 0-31 followed by the PC. */
regs_base = mcontext_base;
for (int i = 0; i < 32; i++)
trad_frame_set_reg_addr (this_cache, OR1K_ZERO_REGNUM + i,
regs_base + (i * 4));
trad_frame_set_reg_addr (this_cache, OR1K_NPC_REGNUM, regs_base + (32 * 4));
trad_frame_set_reg_addr (this_cache, OR1K_SR_REGNUM, regs_base + (33 * 4));
/* Choice of the bottom of the sigframe is somewhat arbitrary. */
trad_frame_set_id (this_cache, frame_id_build (frame_sp, func));
}
/* Initialize OpenRISC Linux ABI info. */
static void
or1k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
linux_init_abi (info, gdbarch);
set_solib_svr4_fetch_link_map_offsets (gdbarch,
svr4_ilp32_fetch_link_map_offsets);
/* GNU/Linux uses SVR4-style shared libraries. */
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
/* GNU/Linux uses the dynamic linker included in the GNU C Library. */
set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
/* Enable TLS support. */
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
set_gdbarch_iterate_over_regset_sections
(gdbarch, or1k_linux_iterate_over_regset_sections);
tramp_frame_prepend_unwinder (gdbarch, &or1k_linux_sigframe);
}
/* Initialize OpenRISC Linux target support. */
void
_initialize_or1k_linux_tdep (void)
{
gdbarch_register_osabi (bfd_arch_or1k, 0, GDB_OSABI_LINUX,
or1k_linux_init_abi);
}
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