-/* Motorola m68k native support for Linux
- Copyright 1996, 1998, 2000, 2001 Free Software Foundation, Inc.
+/* Motorola m68k native support for GNU/Linux.
+
+ Copyright 1996, 1998, 2000, 2001, 2002 Free Software Foundation,
+ Inc.
This file is part of GDB.
/* Fill in the floating-point control registers. */
for (i = FPC_REGNUM; i <= FPI_REGNUM; i++)
if (regno == -1 || regno == i)
- regcache_collect (regno, fpregsetp->fpcntl[regno - FPC_REGNUM]);
+ regcache_collect (regno, (char *) &fpregsetp->fpcntl[regno - FPC_REGNUM]);
}
#ifdef HAVE_PTRACE_GETREGS
return;
}
- /* Linux LWP ID's are process ID's. */
+ /* GNU/Linux LWP ID's are process ID's. */
if ((tid = TIDGET (inferior_ptid)) == 0)
tid = PIDGET (inferior_ptid); /* Not a threaded program. */
return;
}
- /* Linux LWP ID's are process ID's. */
+ /* GNU/Linux LWP ID's are process ID's. */
if ((tid = TIDGET (inferior_ptid)) == 0)
tid = PIDGET (inferior_ptid); /* Not a threaded program. */
0 --- the general-purpose register set, in elf_gregset_t format
2 --- the floating-point register set, in elf_fpregset_t format
- REG_ADDR isn't used on Linux. */
+ REG_ADDR isn't used on GNU/Linux. */
static void
fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
return (sizeof (struct user));
}
\f
-/* Return non-zero if PC points into the signal trampoline. */
+/* Check whether insn1 and insn2 are parts of a signal trampoline. */
+
+#define IS_SIGTRAMP(insn1, insn2) \
+ (/* addaw #20,sp; moveq #119,d0; trap #0 */ \
+ (insn1 == 0xdefc0014 && insn2 == 0x70774e40) \
+ /* moveq #119,d0; trap #0 */ \
+ || insn1 == 0x70774e40)
+
+#define IS_RT_SIGTRAMP(insn1, insn2) \
+ (/* movel #173,d0; trap #0 */ \
+ (insn1 == 0x203c0000 && insn2 == 0x00ad4e40) \
+ /* moveq #82,d0; notb d0; trap #0 */ \
+ || (insn1 == 0x70524600 && (insn2 >> 16) == 0x4e40))
+
+/* Return non-zero if PC points into the signal trampoline. For the sake
+ of m68k_linux_frame_saved_pc we also distinguish between non-RT and RT
+ signal trampolines. */
int
-in_sigtramp (CORE_ADDR pc)
+m68k_linux_in_sigtramp (CORE_ADDR pc)
{
CORE_ADDR sp;
- char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT];
- int insn;
+ char buf[12];
+ unsigned long insn0, insn1, insn2;
- sp = read_register (SP_REGNUM);
- if (pc - 2 < sp)
+ if (read_memory_nobpt (pc - 4, buf, sizeof (buf)))
return 0;
+ insn1 = extract_unsigned_integer (buf + 4, 4);
+ insn2 = extract_unsigned_integer (buf + 8, 4);
+ if (IS_SIGTRAMP (insn1, insn2))
+ return 1;
+ if (IS_RT_SIGTRAMP (insn1, insn2))
+ return 2;
- if (read_memory_nobpt (pc, buf, sizeof (buf)))
- return 0;
- insn = extract_unsigned_integer (buf, sizeof (buf));
- if (insn == 0xdefc /* addaw #,sp */
- || insn == 0x7077 /* moveq #119,d0 */
- || insn == 0x4e40 /* trap #0 */
- || insn == 0x203c /* movel #,d0 */ )
+ insn0 = extract_unsigned_integer (buf, 4);
+ if (IS_SIGTRAMP (insn0, insn1))
return 1;
+ if (IS_RT_SIGTRAMP (insn0, insn1))
+ return 2;
- if (read_memory_nobpt (pc - 2, buf, sizeof (buf)))
- return 0;
- insn = extract_unsigned_integer (buf, sizeof (buf));
- if (insn == 0xdefc /* addaw #,sp */
- || insn == 0x7077 /* moveq #119,d0 */
- || insn == 0x4e40 /* trap #0 */
- || insn == 0x203c /* movel #,d0 */ )
+ insn0 = (insn0 << 16) | (insn1 >> 16);
+ insn1 = (insn1 << 16) | (insn2 >> 16);
+ if (IS_SIGTRAMP (insn0, insn1))
return 1;
+ if (IS_RT_SIGTRAMP (insn0, insn1))
+ return 2;
return 0;
}
+/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */
+#define SIGCONTEXT_PC_OFFSET 26
+
+/* Offset to saved PC in ucontext, from <asm/ucontext.h>. */
+#define UCONTEXT_PC_OFFSET 88
+
+/* Get saved user PC for sigtramp from sigcontext or ucontext. */
+
+static CORE_ADDR
+m68k_linux_sigtramp_saved_pc (struct frame_info *frame)
+{
+ CORE_ADDR sigcontext_addr;
+ char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
+ int ptrbytes = TARGET_PTR_BIT / TARGET_CHAR_BIT;
+ int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT;
+
+ /* Get sigcontext address, it is the third parameter on the stack. */
+ if (frame->next)
+ sigcontext_addr = read_memory_integer (FRAME_ARGS_ADDRESS (frame->next)
+ + FRAME_ARGS_SKIP
+ + sigcontext_offs,
+ ptrbytes);
+ else
+ sigcontext_addr = read_memory_integer (read_register (SP_REGNUM)
+ + sigcontext_offs,
+ ptrbytes);
+
+ /* Don't cause a memory_error when accessing sigcontext in case the
+ stack layout has changed or the stack is corrupt. */
+ if (m68k_linux_in_sigtramp (frame->pc) == 2)
+ target_read_memory (sigcontext_addr + UCONTEXT_PC_OFFSET, buf, ptrbytes);
+ else
+ target_read_memory (sigcontext_addr + SIGCONTEXT_PC_OFFSET, buf, ptrbytes);
+ return extract_unsigned_integer (buf, ptrbytes);
+}
+
+/* Return the saved program counter for FRAME. */
+
+CORE_ADDR
+m68k_linux_frame_saved_pc (struct frame_info *frame)
+{
+ if ((get_frame_type (frame) == SIGTRAMP_FRAME))
+ return m68k_linux_sigtramp_saved_pc (frame);
+
+ return read_memory_integer (frame->frame + 4, 4);
+}
\f
-/* Register that we are able to handle Linux ELF core file formats. */
+/* Register that we are able to handle GNU/Linux ELF core file
+ formats. */
static struct core_fns linux_elf_core_fns =
{
};
void
-_initialize_m68k_linux_nat ()
+_initialize_m68k_linux_nat (void)
{
add_core_fns (&linux_elf_core_fns);
}
projects / deliverable / binutils-gdb.git / blobdiff