/* Motorola m68k target-dependent support for GNU/Linux.
- Copyright 1996, 1998, 2000, 2001, 2002, 2003 Free Software Foundation,
- Inc.
+ Copyright (C) 1996, 1998, 2000, 2001, 2002, 2003, 2004, 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 "gdbcore.h"
#include "objfiles.h"
#include "symtab.h"
#include "m68k-tdep.h"
+#include "trad-frame.h"
+#include "frame-unwind.h"
+#include "glibc-tdep.h"
+#include "solib-svr4.h"
+#include "auxv.h"
+#include "observer.h"
+#include "elf/common.h"
\f
/* Offsets (in target ints) into jmp_buf. */
-1, /* %a5 */
-1, /* %fp */
1 * 4, /* %sp */
- 5 * 4 + 2, /* %sr */
+ 6 * 4, /* %sr */
6 * 4 + 2, /* %pc */
8 * 4, /* %fp0 */
11 * 4, /* %fp1 */
16 * 4 /* %fpiaddr */
};
+static int m68k_uclinux_sigcontext_reg_offset[M68K_NUM_REGS] =
+{
+ 2 * 4, /* %d0 */
+ 3 * 4, /* %d1 */
+ -1, /* %d2 */
+ -1, /* %d3 */
+ -1, /* %d4 */
+ -1, /* %d5 */
+ -1, /* %d6 */
+ -1, /* %d7 */
+ 4 * 4, /* %a0 */
+ 5 * 4, /* %a1 */
+ -1, /* %a2 */
+ -1, /* %a3 */
+ -1, /* %a4 */
+ 6 * 4, /* %a5 */
+ -1, /* %fp */
+ 1 * 4, /* %sp */
+ 7 * 4, /* %sr */
+ 7 * 4 + 2, /* %pc */
+ -1, /* %fp0 */
+ -1, /* %fp1 */
+ -1, /* %fp2 */
+ -1, /* %fp3 */
+ -1, /* %fp4 */
+ -1, /* %fp5 */
+ -1, /* %fp6 */
+ -1, /* %fp7 */
+ -1, /* %fpcr */
+ -1, /* %fpsr */
+ -1 /* %fpiaddr */
+};
+
/* From <asm/ucontext.h>. */
static int m68k_linux_ucontext_reg_offset[M68K_NUM_REGS] =
{
/* Get info about saved registers in sigtramp. */
-static struct m68k_sigtramp_info
+struct m68k_linux_sigtramp_info
+{
+ /* Address of sigcontext. */
+ CORE_ADDR sigcontext_addr;
+
+ /* Offset of registers in `struct sigcontext'. */
+ int *sc_reg_offset;
+};
+
+/* Nonzero if running on uClinux. */
+static int target_is_uclinux;
+
+static void
+m68k_linux_inferior_created (struct target_ops *objfile, int from_tty)
+{
+ /* Record that we will need to re-evaluate whether we are running on a
+ uClinux or normal GNU/Linux target (see m68k_linux_get_sigtramp_info). */
+ target_is_uclinux = -1;
+}
+
+static struct m68k_linux_sigtramp_info
m68k_linux_get_sigtramp_info (struct frame_info *next_frame)
{
CORE_ADDR sp;
char buf[4];
- struct m68k_sigtramp_info info;
+ struct m68k_linux_sigtramp_info info;
+
+ if (target_is_uclinux == -1)
+ {
+ /* Determine whether we are running on a uClinux or normal GNU/Linux
+ target so we can use the correct sigcontext layouts. */
+
+ CORE_ADDR dummy;
+
+ target_is_uclinux
+ = target_auxv_search (¤t_target, AT_NULL, &dummy) > 0
+ && target_auxv_search (¤t_target, AT_PAGESZ, &dummy) == 0;
+ }
frame_unwind_register (next_frame, M68K_SP_REGNUM, buf);
sp = extract_unsigned_integer (buf, 4);
if (m68k_linux_pc_in_sigtramp (frame_pc_unwind (next_frame), 0) == 2)
info.sc_reg_offset = m68k_linux_ucontext_reg_offset;
else
- info.sc_reg_offset = m68k_linux_sigcontext_reg_offset;
+ info.sc_reg_offset
+ = target_is_uclinux ? m68k_uclinux_sigcontext_reg_offset
+ : m68k_linux_sigcontext_reg_offset;
return info;
}
-/* Extract from an array REGBUF containing the (raw) register state, a
- function return value of TYPE, and copy that, in virtual format,
- into VALBUF. */
+/* Signal trampolines. */
-static void
-m68k_linux_extract_return_value (struct type *type, struct regcache *regcache,
- void *valbuf)
+static struct trad_frame_cache *
+m68k_linux_sigtramp_frame_cache (struct frame_info *next_frame,
+ void **this_cache)
{
- int len = TYPE_LENGTH (type);
- char buf[M68K_MAX_REGISTER_SIZE];
+ struct frame_id this_id;
+ struct trad_frame_cache *cache;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (next_frame));
+ struct m68k_linux_sigtramp_info info;
+ char buf[4];
+ int i;
- if (TYPE_CODE (type) == TYPE_CODE_STRUCT
- && TYPE_NFIELDS (type) == 1)
- {
- m68k_linux_extract_return_value (TYPE_FIELD_TYPE (type, 0), regcache,
- valbuf);
- return;
- }
+ if (*this_cache)
+ return *this_cache;
- if (TYPE_CODE (type) == TYPE_CODE_FLT)
- {
- regcache_raw_read (regcache, M68K_FP0_REGNUM, buf);
- convert_typed_floating (buf, builtin_type_m68881_ext, valbuf, type);
- }
- else if (TYPE_CODE (type) == TYPE_CODE_PTR)
- regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf);
- else
- {
- if (len <= 4)
- {
- regcache_raw_read (regcache, M68K_D0_REGNUM, buf);
- memcpy (valbuf, buf + (4 - len), len);
- }
- else if (len <= 8)
- {
- regcache_raw_read (regcache, M68K_D0_REGNUM, buf);
- memcpy (valbuf, buf + (8 - len), len - 4);
- regcache_raw_read (regcache, M68K_D1_REGNUM,
- (char *) valbuf + (len - 4));
- }
- else
- internal_error (__FILE__, __LINE__,
- "Cannot extract return value of %d bytes long.", len);
- }
-}
+ cache = trad_frame_cache_zalloc (next_frame);
+
+ /* FIXME: cagney/2004-05-01: This is is long standing broken code.
+ The frame ID's code address should be the start-address of the
+ signal trampoline and not the current PC within that
+ trampoline. */
+ frame_unwind_register (next_frame, M68K_SP_REGNUM, buf);
+ /* See the end of m68k_push_dummy_call. */
+ this_id = frame_id_build (extract_unsigned_integer (buf, 4) - 4 + 8,
+ frame_pc_unwind (next_frame));
+ trad_frame_set_id (cache, this_id);
-/* Write into the appropriate registers a function return value stored
- in VALBUF of type TYPE, given in virtual format. */
+ info = m68k_linux_get_sigtramp_info (next_frame);
+
+ for (i = 0; i < M68K_NUM_REGS; i++)
+ if (info.sc_reg_offset[i] != -1)
+ trad_frame_set_reg_addr (cache, i,
+ info.sigcontext_addr + info.sc_reg_offset[i]);
+
+ *this_cache = cache;
+ return cache;
+}
static void
-m68k_linux_store_return_value (struct type *type, struct regcache *regcache,
- const void *valbuf)
+m68k_linux_sigtramp_frame_this_id (struct frame_info *next_frame,
+ void **this_cache,
+ struct frame_id *this_id)
{
- int len = TYPE_LENGTH (type);
-
- if (TYPE_CODE (type) == TYPE_CODE_STRUCT
- && TYPE_NFIELDS (type) == 1)
- {
- m68k_linux_store_return_value (TYPE_FIELD_TYPE (type, 0), regcache,
- valbuf);
- return;
- }
+ struct trad_frame_cache *cache =
+ m68k_linux_sigtramp_frame_cache (next_frame, this_cache);
+ trad_frame_get_id (cache, this_id);
+}
- if (TYPE_CODE (type) == TYPE_CODE_FLT)
- {
- char buf[M68K_MAX_REGISTER_SIZE];
- convert_typed_floating (valbuf, type, buf, builtin_type_m68881_ext);
- regcache_raw_write (regcache, M68K_FP0_REGNUM, buf);
- }
- else if (TYPE_CODE (type) == TYPE_CODE_PTR)
- regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf);
- else
- {
- if (len <= 4)
- regcache_raw_write_part (regcache, M68K_D0_REGNUM,
- 4 - len, len, valbuf);
- else if (len <= 8)
- {
- regcache_raw_write_part (regcache, M68K_D1_REGNUM, 8 - len,
- len - 4, valbuf);
- regcache_raw_write (regcache, M68K_D0_REGNUM,
- (char *) valbuf + (len - 4));
- }
- else
- internal_error (__FILE__, __LINE__,
- "Cannot store return value of %d bytes long.", len);
- }
+static void
+m68k_linux_sigtramp_frame_prev_register (struct frame_info *next_frame,
+ void **this_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp,
+ CORE_ADDR *addrp,
+ int *realnump, gdb_byte *valuep)
+{
+ /* Make sure we've initialized the cache. */
+ struct trad_frame_cache *cache =
+ m68k_linux_sigtramp_frame_cache (next_frame, this_cache);
+ trad_frame_get_register (cache, next_frame, regnum, optimizedp, lvalp,
+ addrp, realnump, valuep);
}
-/* Extract from an array REGBUF containing the (raw) register state
- the address in which a function should return its structure value,
- as a CORE_ADDR. */
+static const struct frame_unwind m68k_linux_sigtramp_frame_unwind =
+{
+ SIGTRAMP_FRAME,
+ m68k_linux_sigtramp_frame_this_id,
+ m68k_linux_sigtramp_frame_prev_register
+};
-static CORE_ADDR
-m68k_linux_extract_struct_value_address (struct regcache *regcache)
+static const struct frame_unwind *
+m68k_linux_sigtramp_frame_sniffer (struct frame_info *next_frame)
{
- char buf[4];
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+ char *name;
- regcache_cooked_read (regcache, M68K_A0_REGNUM, buf);
- return extract_unsigned_integer (buf, 4);
+ find_pc_partial_function (pc, &name, NULL, NULL);
+ if (m68k_linux_pc_in_sigtramp (pc, name))
+ return &m68k_linux_sigtramp_frame_unwind;
+
+ return NULL;
}
static void
tdep->jb_pc = M68K_LINUX_JB_PC;
tdep->jb_elt_size = M68K_LINUX_JB_ELEMENT_SIZE;
- tdep->get_sigtramp_info = m68k_linux_get_sigtramp_info;
- set_gdbarch_extract_return_value (gdbarch, m68k_linux_extract_return_value);
- set_gdbarch_store_return_value (gdbarch, m68k_linux_store_return_value);
- set_gdbarch_extract_struct_value_address (gdbarch,
- m68k_linux_extract_struct_value_address);
+ /* GNU/Linux uses a calling convention that's similar to SVR4. It
+ returns integer values in %d0/%d1, pointer values in %a0 and
+ floating values in %fp0, just like SVR4, but uses %a1 to pass the
+ address to store a structure value. It also returns small
+ structures in registers instead of memory. */
+ m68k_svr4_init_abi (info, gdbarch);
+ tdep->struct_value_regnum = M68K_A1_REGNUM;
+ tdep->struct_return = reg_struct_return;
+
+ set_gdbarch_decr_pc_after_break (gdbarch, 2);
- set_gdbarch_pc_in_sigtramp (gdbarch, m68k_linux_pc_in_sigtramp);
+ frame_unwind_append_sniffer (gdbarch, m68k_linux_sigtramp_frame_sniffer);
/* Shared library handling. */
- set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section);
+
+ /* GNU/Linux uses SVR4-style shared libraries. */
+ set_solib_svr4_fetch_link_map_offsets (gdbarch,
+ svr4_ilp32_fetch_link_map_offsets);
+
+ /* GNU/Linux uses the dynamic linker included in the GNU C Library. */
+ set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
+
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+
+ /* Enable TLS support. */
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
}
void
{
gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_LINUX,
m68k_linux_init_abi);
+ observer_attach_inferior_created (m68k_linux_inferior_created);
}