/* Target-dependent code for GNU/Linux UltraSPARC.
- Copyright 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2005, 2007 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,
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 <http://www.gnu.org/licenses/>. */
#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 "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. */
-
-#define LINUX64_RT_SIGTRAMP_INSN0 0x82102065
-#define LINUX64_RT_SIGTRAMP_INSN1 0x91d0206d
-
+/* Signal trampoline support. */
static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
struct frame_info *next_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
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 += 128;
- /* Offsets from <bits/sigcontext.h> */
+ /* Offsets from <bits/sigcontext.h>. */
/* 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 = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
+ if (base & 1)
+ base += BIAS;
- addr = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
+ addr = get_frame_memory_unsigned (next_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);
trad_frame_set_id (this_cache, frame_id_build (base, func));
}
\f
+/* 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)
+ {
+ 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);
+ }
+
+ return 0;
+}
+\f
+
+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 */
+};
+\f
+
+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 (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 (regcache, regnum, fpregs);
+}
+
+\f
+
static void
sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (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. */
+ frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
+
+ 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;
}
+\f
/* Provide a prototype to silence -Wmissing-prototypes. */
extern void _initialize_sparc64_linux_tdep (void);
projects / deliverable / binutils-gdb.git / blobdiff