X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fsparc64-linux-tdep.c;h=3f53f6c1acf0172a9cd3eb5822df05525c5e8bb8;hb=4b4589ada7e88f2f36d264a173d95ed5994b3acb;hp=3401d2b4fcc9aa374b45011e04174a56a9c23d4d;hpb=81f726abf0aa11a89163ad39b7a0a5575d96b023;p=deliverable%2Fbinutils-gdb.git
diff --git a/gdb/sparc64-linux-tdep.c b/gdb/sparc64-linux-tdep.c
index 3401d2b4fc..3f53f6c1ac 100644
--- a/gdb/sparc64-linux-tdep.c
+++ b/gdb/sparc64-linux-tdep.c
@@ -1,12 +1,12 @@
/* Target-dependent code for GNU/Linux UltraSPARC.
- Copyright 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2003-2013 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 2 of the License, or
+ 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,
@@ -15,44 +15,46 @@
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, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see . */
#include "defs.h"
#include "frame.h"
#include "frame-unwind.h"
-#include "tramp-frame.h"
+#include "dwarf2-frame.h"
+#include "regset.h"
+#include "regcache.h"
#include "gdbarch.h"
+#include "gdbcore.h"
#include "osabi.h"
#include "solib-svr4.h"
#include "symtab.h"
#include "trad-frame.h"
+#include "tramp-frame.h"
+#include "xml-syscall.h"
+#include "linux-tdep.h"
-#include "sparc64-tdep.h"
-
-/* The instruction sequence for RT signals is
- mov __NR_rt_sigreturn, %g1 ! hex: 0x82102065
- ta 0x6d ! hex: 0x91d0206d
-
- The effect is to call the system call rt_sigreturn.
- Note that 64-bit binaries only use this RT signal return method. */
+/* The syscall's XML filename for sparc 64-bit. */
+#define XML_SYSCALL_FILENAME_SPARC64 "syscalls/sparc64-linux.xml"
-#define LINUX64_RT_SIGTRAMP_INSN0 0x82102065
-#define LINUX64_RT_SIGTRAMP_INSN1 0x91d0206d
+#include "sparc64-tdep.h"
+/* Signal trampoline support. */
static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
- struct frame_info *next_frame,
+ struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func);
-static const struct tramp_frame sparc64_linux_rt_sigframe = {
+/* See sparc-linux-tdep.c for details. Note that 64-bit binaries only
+ use RT signals. */
+
+static const struct tramp_frame sparc64_linux_rt_sigframe =
+{
SIGTRAMP_FRAME,
4,
{
- { LINUX64_RT_SIGTRAMP_INSN0, -1 },
- { LINUX64_RT_SIGTRAMP_INSN1, -1 },
+ { 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */
+ { 0x91d0206d, -1 }, /* ta 0x6d */
{ TRAMP_SENTINEL_INSN, -1 }
},
sparc64_linux_sigframe_init
@@ -60,37 +62,41 @@ static const struct tramp_frame sparc64_linux_rt_sigframe = {
static void
sparc64_linux_sigframe_init (const struct tramp_frame *self,
- struct frame_info *next_frame,
+ struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
- CORE_ADDR base, addr;
+ CORE_ADDR base, addr, sp_addr;
int regnum;
- base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM);
+ base = get_frame_register_unsigned (this_frame, SPARC_O1_REGNUM);
base += 128;
- /* Offsets from */
+ /* Offsets from . */
/* Since %g0 is always zero, keep the identity encoding. */
- addr = base + 0x08;
+ addr = base + 8;
+ sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8);
for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
{
trad_frame_set_reg_addr (this_cache, regnum, addr);
addr += 8;
}
- trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0x00);
- trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 0x08);
- trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 0x10);
- trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 0x18);
- trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 0x1c);
+ trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);
+ trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);
+ trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);
+ trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
+ trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);
+
+ base = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM);
+ if (base & 1)
+ base += BIAS;
- addr = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
+ addr = get_frame_memory_unsigned (this_frame, sp_addr, 8);
if (addr & 1)
addr += BIAS;
- base = addr;
for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
{
trad_frame_set_reg_addr (this_cache, regnum, addr);
@@ -99,23 +105,181 @@ sparc64_linux_sigframe_init (const struct tramp_frame *self,
trad_frame_set_id (this_cache, frame_id_build (base, func));
}
+/* Return the address of a system call's alternative return
+ address. */
+
+static CORE_ADDR
+sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn)
+{
+ if (insn == 0x91d0206d)
+ {
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM);
+ if (sp & 1)
+ sp += BIAS;
+
+ /* The kernel puts the sigreturn registers on the stack,
+ and this is where the signal unwinding state is take from
+ when returning from a signal.
+
+ A siginfo_t sits 192 bytes from the base of the stack. This
+ siginfo_t is 128 bytes, and is followed by the sigreturn
+ register save area. The saved PC sits at a 136 byte offset
+ into there. */
+
+ return read_memory_unsigned_integer (sp + 192 + 128 + 136,
+ 8, byte_order);
+ }
+
+ return 0;
+}
+
+
+const struct sparc_gregset sparc64_linux_core_gregset =
+{
+ 32 * 8, /* %tstate */
+ 33 * 8, /* %tpc */
+ 34 * 8, /* %tnpc */
+ 35 * 8, /* %y */
+ -1, /* %wim */
+ -1, /* %tbr */
+ 1 * 8, /* %g1 */
+ 16 * 8, /* %l0 */
+ 8, /* y size */
+};
+
+
+static void
+sparc64_linux_supply_core_gregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *gregs, size_t len)
+{
+ sparc64_supply_gregset (&sparc64_linux_core_gregset,
+ regcache, regnum, gregs);
+}
+
+static void
+sparc64_linux_collect_core_gregset (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *gregs, size_t len)
+{
+ sparc64_collect_gregset (&sparc64_linux_core_gregset,
+ regcache, regnum, gregs);
+}
+
+static void
+sparc64_linux_supply_core_fpregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *fpregs, size_t len)
+{
+ sparc64_supply_fpregset (&sparc64_bsd_fpregset, regcache, regnum, fpregs);
+}
+
+static void
+sparc64_linux_collect_core_fpregset (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *fpregs, size_t len)
+{
+ sparc64_collect_fpregset (&sparc64_bsd_fpregset, regcache, regnum, fpregs);
+}
+
+/* Set the program counter for process PTID to PC. */
+
+#define TSTATE_SYSCALL 0x0000000000000020ULL
+
+static void
+sparc64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+ ULONGEST state;
+
+ regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
+ regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4);
+
+ /* Clear the "in syscall" bit to prevent the kernel from
+ messing with the PCs we just installed, if we happen to be
+ within an interrupted system call that the kernel wants to
+ restart.
+
+ Note that after we return from the dummy call, the TSTATE et al.
+ registers will be automatically restored, and the kernel
+ continues to restart the system call at this point. */
+ regcache_cooked_read_unsigned (regcache, SPARC64_STATE_REGNUM, &state);
+ state &= ~TSTATE_SYSCALL;
+ regcache_cooked_write_unsigned (regcache, SPARC64_STATE_REGNUM, state);
+}
+
+static LONGEST
+sparc64_linux_get_syscall_number (struct gdbarch *gdbarch,
+ ptid_t ptid)
+{
+ struct regcache *regcache = get_thread_regcache (ptid);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ /* The content of a register. */
+ gdb_byte buf[8];
+ /* The result. */
+ LONGEST ret;
+
+ /* Getting the system call number from the register.
+ When dealing with the sparc architecture, this information
+ is stored at the %g1 register. */
+ regcache_cooked_read (regcache, SPARC_G1_REGNUM, buf);
+
+ ret = extract_signed_integer (buf, 8, byte_order);
+
+ return ret;
+}
+
+
+
static void
sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ linux_init_abi (info, gdbarch);
+
+ tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset,
+ sparc64_linux_collect_core_gregset);
+ tdep->sizeof_gregset = 288;
+
+ tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset,
+ sparc64_linux_collect_core_fpregset);
+ tdep->sizeof_fpregset = 280;
+
tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);
- /* GNU/Linux is very similar to Solaris ... */
- sparc64_sol2_init_abi (info, gdbarch);
+ /* Hook in the DWARF CFI frame unwinder. */
+ dwarf2_append_unwinders (gdbarch);
+
+ sparc64_init_abi (info, gdbarch);
+
+ /* GNU/Linux has SVR4-style shared libraries... */
+ set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_lp64_fetch_link_map_offsets);
- /* ... but doesn't have kernel-assisted single-stepping support. */
- set_gdbarch_software_single_step (gdbarch, sparc_software_single_step);
+ /* ...which means that we need some special handling when doing
+ prologue analysis. */
+ tdep->plt_entry_size = 16;
/* Enable TLS support. */
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
+
+ /* Make sure we can single-step over signal return system calls. */
+ tdep->step_trap = sparc64_linux_step_trap;
+
+ set_gdbarch_write_pc (gdbarch, sparc64_linux_write_pc);
+
+ /* Functions for 'catch syscall'. */
+ set_xml_syscall_file_name (XML_SYSCALL_FILENAME_SPARC64);
+ set_gdbarch_get_syscall_number (gdbarch,
+ sparc64_linux_get_syscall_number);
}
+
/* Provide a prototype to silence -Wmissing-prototypes. */
extern void _initialize_sparc64_linux_tdep (void);