--- /dev/null
+/* 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,
+ PSTATE and two extra pseudo 64-bit registers, as defined in the
+ AArch64 port of the Linux kernel. */
+#define AARCH64_LINUX_SIZEOF_GREGSET (36 * 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);
+
+ /* 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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