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[PATCH 2/3] Use code cache in arm prologue analyzer
- From: Yao Qi <qiyaoltc at gmail dot com>
- To: gdb-patches at sourceware dot org
- Date: Tue, 6 Dec 2016 15:03:48 +0000
- Subject: [PATCH 2/3] Use code cache in arm prologue analyzer
- Authentication-results: sourceware.org; auth=none
- References: <1481036629-21542-1-git-send-email-yao.qi@linaro.org>
This patch change arm prologue analyzer using code cache, in order
to improve the performance of remote debugging.
gdb.perf/skip-prologue.exp (measured by wall-time) is improved a lot,
Original Patched Original Patched
without dbg without dbg with dbg with dbg
-marm 14.166741848 9.32852292061 11.4908499718 9.16302204132
-marm 14.6705040932 9.34849786758 18.2788009644 9.14823913574
\-fstack-protector-all
-mthumb 34.4391930103 10.6062178612 13.7886838913 10.3094120026
-mthumb
\-fstack-protector-all 34.9310460091 10.6413481236 25.3875930309 10.6294929981
gdb:
2016-12-06 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c (skip_prologue_function): Call
read_code_unsigned_integer instead of
read_memory_unsigned_integer.
(thumb_analyze_prologue): Likewise.
(arm_analyze_load_stack_chk_guard): Likewise.
(arm_skip_stack_protector): Likewise.
(arm_analyze_prologue):Likewise.
(extend_buffer_earlier): Call target_read_code instead
of target_read_memory.
(arm_adjust_breakpoint_address): Likewise.
---
gdb/arm-tdep.c | 38 +++++++++++++++++++-------------------
1 file changed, 19 insertions(+), 19 deletions(-)
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index fd5d0de..97dea89 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -570,9 +570,9 @@ skip_prologue_function (struct gdbarch *gdbarch, CORE_ADDR pc, int is_thumb)
implementation (this is hand-written ARM assembler in glibc). */
if (!is_thumb
- && read_memory_unsigned_integer (pc, 4, byte_order_for_code)
+ && read_code_unsigned_integer (pc, 4, byte_order_for_code)
== 0xe3e00a0f /* mov r0, #0xffff0fff */
- && read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code)
+ && read_code_unsigned_integer (pc + 4, 4, byte_order_for_code)
== 0xe240f01f) /* sub pc, r0, #31 */
return 1;
}
@@ -659,7 +659,7 @@ thumb_analyze_prologue (struct gdbarch *gdbarch,
{
unsigned short insn;
- insn = read_memory_unsigned_integer (start, 2, byte_order_for_code);
+ insn = read_code_unsigned_integer (start, 2, byte_order_for_code);
if ((insn & 0xfe00) == 0xb400) /* push { rlist } */
{
@@ -790,8 +790,8 @@ thumb_analyze_prologue (struct gdbarch *gdbarch,
{
unsigned short inst2;
- inst2 = read_memory_unsigned_integer (start + 2, 2,
- byte_order_for_code);
+ inst2 = read_code_unsigned_integer (start + 2, 2,
+ byte_order_for_code);
if ((insn & 0xf800) == 0xf000 && (inst2 & 0xe800) == 0xe800)
{
@@ -1134,7 +1134,7 @@ arm_analyze_load_stack_chk_guard(CORE_ADDR pc, struct gdbarch *gdbarch,
if (is_thumb)
{
unsigned short insn1
- = read_memory_unsigned_integer (pc, 2, byte_order_for_code);
+ = read_code_unsigned_integer (pc, 2, byte_order_for_code);
if ((insn1 & 0xf800) == 0x4800) /* ldr Rd, #immed */
{
@@ -1147,14 +1147,14 @@ arm_analyze_load_stack_chk_guard(CORE_ADDR pc, struct gdbarch *gdbarch,
else if ((insn1 & 0xfbf0) == 0xf240) /* movw Rd, #const */
{
unsigned short insn2
- = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code);
+ = read_code_unsigned_integer (pc + 2, 2, byte_order_for_code);
low = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2);
insn1
- = read_memory_unsigned_integer (pc + 4, 2, byte_order_for_code);
+ = read_code_unsigned_integer (pc + 4, 2, byte_order_for_code);
insn2
- = read_memory_unsigned_integer (pc + 6, 2, byte_order_for_code);
+ = read_code_unsigned_integer (pc + 6, 2, byte_order_for_code);
/* movt Rd, #const */
if ((insn1 & 0xfbc0) == 0xf2c0)
@@ -1169,7 +1169,7 @@ arm_analyze_load_stack_chk_guard(CORE_ADDR pc, struct gdbarch *gdbarch,
else
{
unsigned int insn
- = read_memory_unsigned_integer (pc, 4, byte_order_for_code);
+ = read_code_unsigned_integer (pc, 4, byte_order_for_code);
if ((insn & 0x0e5f0000) == 0x041f0000) /* ldr Rd, [PC, #immed] */
{
@@ -1185,7 +1185,7 @@ arm_analyze_load_stack_chk_guard(CORE_ADDR pc, struct gdbarch *gdbarch,
low = EXTRACT_MOVW_MOVT_IMM_A (insn);
insn
- = read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code);
+ = read_code_unsigned_integer (pc + 4, 4, byte_order_for_code);
if ((insn & 0x0ff00000) == 0x03400000) /* movt Rd, #const */
{
@@ -1257,7 +1257,7 @@ arm_skip_stack_protector(CORE_ADDR pc, struct gdbarch *gdbarch)
{
unsigned int destreg;
unsigned short insn
- = read_memory_unsigned_integer (pc + offset, 2, byte_order_for_code);
+ = read_code_unsigned_integer (pc + offset, 2, byte_order_for_code);
/* Step 2: ldr Rd, [Rn, #immed], encoding T1. */
if ((insn & 0xf800) != 0x6800)
@@ -1266,8 +1266,8 @@ arm_skip_stack_protector(CORE_ADDR pc, struct gdbarch *gdbarch)
return pc;
destreg = bits (insn, 0, 2);
- insn = read_memory_unsigned_integer (pc + offset + 2, 2,
- byte_order_for_code);
+ insn = read_code_unsigned_integer (pc + offset + 2, 2,
+ byte_order_for_code);
/* Step 3: str Rd, [Rn, #immed], encoding T1. */
if ((insn & 0xf800) != 0x6000)
return pc;
@@ -1278,7 +1278,7 @@ arm_skip_stack_protector(CORE_ADDR pc, struct gdbarch *gdbarch)
{
unsigned int destreg;
unsigned int insn
- = read_memory_unsigned_integer (pc + offset, 4, byte_order_for_code);
+ = read_code_unsigned_integer (pc + offset, 4, byte_order_for_code);
/* Step 2: ldr Rd, [Rn, #immed], encoding A1. */
if ((insn & 0x0e500000) != 0x04100000)
@@ -1287,7 +1287,7 @@ arm_skip_stack_protector(CORE_ADDR pc, struct gdbarch *gdbarch)
return pc;
destreg = bits (insn, 12, 15);
/* Step 3: str Rd, [Rn, #immed], encoding A1. */
- insn = read_memory_unsigned_integer (pc + offset + 4,
+ insn = read_code_unsigned_integer (pc + offset + 4,
4, byte_order_for_code);
if ((insn & 0x0e500000) != 0x04000000)
return pc;
@@ -1511,7 +1511,7 @@ arm_analyze_prologue (struct gdbarch *gdbarch,
current_pc += 4)
{
unsigned int insn
- = read_memory_unsigned_integer (current_pc, 4, byte_order_for_code);
+ = read_code_unsigned_integer (current_pc, 4, byte_order_for_code);
if (insn == 0xe1a0c00d) /* mov ip, sp */
{
@@ -4250,7 +4250,7 @@ extend_buffer_earlier (gdb_byte *buf, CORE_ADDR endaddr,
new_buf = (gdb_byte *) xmalloc (new_len);
memcpy (new_buf + bytes_to_read, buf, old_len);
xfree (buf);
- if (target_read_memory (endaddr - new_len, new_buf, bytes_to_read) != 0)
+ if (target_read_code (endaddr - new_len, new_buf, bytes_to_read) != 0)
{
xfree (new_buf);
return NULL;
@@ -4314,7 +4314,7 @@ arm_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr)
return bpaddr;
buf = (gdb_byte *) xmalloc (buf_len);
- if (target_read_memory (bpaddr - buf_len, buf, buf_len) != 0)
+ if (target_read_code (bpaddr - buf_len, buf, buf_len) != 0)
return bpaddr;
any = 0;
for (i = 0; i < buf_len; i += 2)
--
1.9.1