/* 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
+ Free Software Foundation, Inc.
This file is part of GDB.
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. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "gdbcore.h"
#include "m68k-tdep.h"
#include "trad-frame.h"
#include "frame-unwind.h"
+#include "glibc-tdep.h"
+#include "solib-svr4.h"
\f
/* Offsets (in target ints) into jmp_buf. */
int regnum, int *optimizedp,
enum lval_type *lvalp,
CORE_ADDR *addrp,
- int *realnump, void *valuep)
+ int *realnump, gdb_byte *valuep)
{
/* Make sure we've initialized the cache. */
struct trad_frame_cache *cache =
return NULL;
}
-/* Extract from an array REGBUF containing the (raw) register state, a
- function return value of TYPE, and copy that, in virtual format,
- into VALBUF. */
-
-static void
-m68k_linux_extract_return_value (struct type *type, struct regcache *regcache,
- void *valbuf)
-{
- int len = TYPE_LENGTH (type);
- char buf[M68K_MAX_REGISTER_SIZE];
-
- 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 (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);
- }
-}
-
-/* Write into the appropriate registers a function return value stored
- in VALBUF of type TYPE, given in virtual format. */
-
-static void
-m68k_linux_store_return_value (struct type *type, struct regcache *regcache,
- const void *valbuf)
-{
- 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;
- }
-
- 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);
- }
-}
-
-/* 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 CORE_ADDR
-m68k_linux_extract_struct_value_address (struct regcache *regcache)
-{
- char buf[4];
-
- regcache_cooked_read (regcache, M68K_A0_REGNUM, buf);
- return extract_unsigned_integer (buf, 4);
-}
-
static void
m68k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
tdep->jb_pc = M68K_LINUX_JB_PC;
tdep->jb_elt_size = M68K_LINUX_JB_ELEMENT_SIZE;
- tdep->struct_return = reg_struct_return;
- set_gdbarch_extract_return_value (gdbarch, m68k_linux_extract_return_value);
- set_gdbarch_store_return_value (gdbarch, m68k_linux_store_return_value);
- set_gdbarch_deprecated_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;
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
projects / binutils.git / blobdiff