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* alpha-linux-tdep.c (alpha_linux_sigtramp_offset_1): New.

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(alpha_linux_sigtramp_offset): Use it.  Make static.
	(alpha_linux_sigcontext_addr): Handle __NR_rt_sigreturn;
	update for new frame model.
	* alpha-mdebug-tdep.c: New file.
	* alpha-osf1-tdep.c (alpha_call_dummy_address): Move from alpha-tdep.c.
	(alpha_osf1_init_abi): Install it.
	* alpha-tdep.c (PROC_*): Move to alpha-mdebug-tdep.c.
	(linked_proc_desc_table): Remove.
	(alpha_frame_past_sigtramp_frame): Remove.
	(alpha_dynamic_sigtramp_offset): Remove.
	(ALPHA_PROC_SIGTRAMP_MAGIC): Remove.
	(alpha_proc_desc_is_dyn_sigtramp): Remove.
	(alpha_set_proc_desc_is_dyn_sigtramp): Remove.
	(push_sigtramp_desc): Remove.
	(alpha_cannot_fetch_register): Use ALPHA_FP_REGNUM.
	(alpha_cannot_store_register): Likewise.
	(alpha_sigcontext_addr): Remove.
	(alpha_find_saved_regs): Remove.
	(alpha_frame_init_saved_regs): Remove.
	(alpha_init_frame_pc_first): Remove.
	(read_next_frame_reg): Remove.
	(alpha_frame_saved_pc): Remove.
	(alpha_saved_pc_after_call): Remove.
	(temp_proc_desc, temp_saved_regs): Remove.
	(alpha_about_to_return): Remove.
	(cached_proc_desc): Remove.
	(alpha_frame_chain): Remove.
	(alpha_print_extra_frame_info): Remove.
	(alpha_init_extra_frame_info): Remove.
	(alpha_frame_locals_address): Remove.
	(alpha_frame_args_address): Remove.
	(alpha_push_arguments): Use ALPHA_REGISTER_BYTES not sizeof CORE_ADDR.
	(alpha_push_dummy_frame): Remove.
	(alpha_pop_frame): Remove.
	(alpha_after_prologue): Rename from after_prologue; remove mdebug bits.
	(alpha_read_insn): New.
	(alpha_skip_prologue): Merge alpha_skip_prologue_internal; adjust
	for different insn encodings.
	(alpha_in_lenient_prologue): Remove.
	(struct alpha_sigtramp_unwind_cache): New.
	(alpha_sigtramp_frame_unwind_cache): New.
	(alpha_sigtramp_register_address): New.
	(alpha_sigtramp_frame_this_id): New.
	(alpha_sigtramp_frame_prev_register): New.
	(alpha_sigtramp_frame_unwind): New.
	(alpha_sigtramp_frame_p): New.
	(struct alpha_heuristic_unwind_cache): New.
	(alpha_heuristic_proc_start): Rename from heuristic_proc_start;
	don't count nop insns that occur between functions.
	(alpha_heuristic_frame_unwind_cache): New; incorporate much of
	heuristic_proc_desc, but without the mdebug wrapping.
	(alpha_heuristic_frame_this_id): New.
	(alpha_heuristic_frame_prev_register): New.
	(alpha_heuristic_frame_unwind): New.
	(alpha_heuristic_frame_p): New.
	(alpha_heuristic_frame_base_address): New.
	(alpha_heuristic_frame_base): New.
	(alpha_unwind_dummy_id): New.
	(alpha_unwind_pc): New.
	(alpha_gdbarch_init): Don't set skip_sigtramp_frame.  Kill use of
	frame related deprecated initializations; install replacements.
	(alpha_dump_tdep): Remove.
	* alpha-tdep.h (struct gdbarch_tdep): Remove skip_sigtramp_frame.
	(alpha_read_insn, alpha_after_prologue,
	alpha_heuristic_frame_unwind_cache, alpha_heuristic_frame_this_id,
	alpha_heuristic_frame_prev_register,
	alpha_heuristic_frame_base_address, alpha_mdebug_init_abi): Declare.
	* config/alpha/alpha-linux.mt (TDEPFILES): Add alpha-mdebug-tdep.o.
	* config/alpha/tm-alpha.h (PRINT_EXTRA_FRAME_INFO): Remove.
	* config/alpha/tm-alphalinux.h (SIGTRAMP_START, SIGTRAMP_END): Remove.
This commit is contained in:
Richard Henderson
2003-05-29 23:02:53 +00:00
parent e9ecd94986
commit d2427a719b
9 changed files with 1450 additions and 1529 deletions
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138
gdb/alpha-linux-tdep.c
View File

@@ -23,93 +23,121 @@
#include "gdbcore.h"
#include "value.h"
#include "osabi.h"
#include "gdb_assert.h"
#include "alpha-tdep.h"
/* Under GNU/Linux, signal handler invocations can be identified by the
designated code sequence that is used to return from a signal
/* Under GNU/Linux, signal handler invocations can be identified by
the designated code sequence that is used to return from a signal
handler. In particular, the return address of a signal handler
points to the following sequence (the first instruction is quadword
aligned):
bis $30,$30,$16
addq $31,0x67,$0
call_pal callsys
Each instruction has a unique encoding, so we simply attempt to
match the instruction the pc is pointing to with any of the above
instructions. If there is a hit, we know the offset to the start
of the designated sequence and can then check whether we really are
executing in a designated sequence. If not, -1 is returned,
otherwise the offset from the start of the desingated sequence is
returned.
There is a slight chance of false hits: code could jump into the
middle of the designated sequence, in which case there is no
guarantee that we are in the middle of a sigreturn syscall. Don't
think this will be a problem in praxis, though. */
LONGEST
alpha_linux_sigtramp_offset (CORE_ADDR pc)
points to a sequence that copies $sp to $16, loads $0 with the
appropriate syscall number, and finally enters the kernel.
This is somewhat complicated in that:
(1) the expansion of the "mov" assembler macro has changed over
time, from "bis src,src,dst" to "bis zero,src,dst",
(2) the kernel has changed from using "addq" to "lda" to load the
syscall number,
(3) there is a "normal" sigreturn and an "rt" sigreturn which
has a different stack layout.
*/
static long
alpha_linux_sigtramp_offset_1 (CORE_ADDR pc)
{
unsigned int i[3], w;
long off;
if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
return -1;
off = -1;
switch (w)
switch (alpha_read_insn (pc))
{
case 0x47de0410:
off = 0;
break; /* bis $30,$30,$16 */
case 0x43ecf400:
off = 4;
break; /* addq $31,0x67,$0 */
case 0x00000083:
off = 8;
break; /* call_pal callsys */
case 0x47de0410: /* bis $30,$30,$16 */
case 0x47fe0410: /* bis $31,$30,$16 */
return 0;
case 0x43ecf400: /* addq $31,103,$0 */
case 0x201f0067: /* lda $0,103($31) */
case 0x201f015f: /* lda $0,351($31) */
return 4;
case 0x00000083: /* call_pal callsys */
return 8;
default:
return -1;
}
pc -= off;
if (pc & 0x7)
{
/* designated sequence is not quadword aligned */
return -1;
}
if (read_memory_nobpt (pc, (char *) i, sizeof (i)) != 0)
}
static LONGEST
alpha_linux_sigtramp_offset (CORE_ADDR pc)
{
long i, off;
if (pc & 3)
return -1;
if (i[0] == 0x47de0410 && i[1] == 0x43ecf400 && i[2] == 0x00000083)
return off;
/* Guess where we might be in the sequence. */
off = alpha_linux_sigtramp_offset_1 (pc);
if (off < 0)
return -1;
return -1;
/* Verify that the other two insns of the sequence are as we expect. */
pc -= off;
for (i = 0; i < 12; i += 4)
{
if (i == off)
continue;
if (alpha_linux_sigtramp_offset_1 (pc + i) != i)
return -1;
}
return off;
}
static int
alpha_linux_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
{
return (alpha_linux_sigtramp_offset (pc) >= 0);
return alpha_linux_sigtramp_offset (pc) >= 0;
}
static CORE_ADDR
alpha_linux_sigcontext_addr (struct frame_info *frame)
alpha_linux_sigcontext_addr (struct frame_info *next_frame)
{
return (get_frame_base (frame) - 0x298); /* sizeof(struct sigcontext) */
CORE_ADDR pc;
ULONGEST sp;
long off;
pc = frame_pc_unwind (next_frame);
frame_unwind_unsigned_register (next_frame, ALPHA_SP_REGNUM, &sp);
off = alpha_linux_sigtramp_offset (pc);
gdb_assert (off >= 0);
/* __NR_rt_sigreturn has a couple of structures on the stack. This is:
struct rt_sigframe {
struct siginfo info;
struct ucontext uc;
};
offsetof (struct rt_sigframe, uc.uc_mcontext);
*/
if (alpha_read_insn (pc - off + 4) == 0x201f015f)
return sp + 176;
/* __NR_sigreturn has the sigcontext structure at the top of the stack. */
return sp;
}
static void
alpha_linux_init_abi (struct gdbarch_info info,
struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
struct gdbarch_tdep *tdep;
alpha_mdebug_init_abi (info, gdbarch);
set_gdbarch_pc_in_sigtramp (gdbarch, alpha_linux_pc_in_sigtramp);
tdep = gdbarch_tdep (gdbarch);
tdep->dynamic_sigtramp_offset = alpha_linux_sigtramp_offset;
tdep->sigcontext_addr = alpha_linux_sigcontext_addr;
tdep->jb_pc = 2;
tdep->jb_elt_size = 8;
}