mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2025-02-09 10:42:48 +00:00
* ppc-tdep.h (ppc_insns_match_pattern): Update prototype.
* rs6000-tdep.c (read_insn): Add frame param, don't assume big-endian. (ppc_insns_match_pattern): Add frame param. Avoid multiple target mem reads on optional insns. * ppc-linux-tdep.c (ppc_skip_trampoline_code): Update ppc_insns_match_pattern calls. * ppc64-tdep.c (ppc64_standard_linkage2, ppc64_standard_linkage3): Add match for power7 thread safety insns, and new order of std 2,40(1) insn. Correct code shown for _dl_runtime_resolve invocation in comment, and update rest of comment. (PPC64_STANDARD_LINKAGE1_LEN, PPC64_STANDARD_LINKAGE2_LEN, PPC64_STANDARD_LINKAGE3_LEN): Delete. (ppc64_standard_linkage2_target): Update insn offsets. (ppc64_skip_trampoline_code): Use a single insn buffer. Match newer stubs first. Update calls.
This commit is contained in:
Alan Modra
parent
404e278f8d
commit
845d47080b
@ -1,3 +1,21 @@
|
||||
2013-06-04 Alan Modra <amodra@gmail.com>
|
||||
|
||||
* ppc-tdep.h (ppc_insns_match_pattern): Update prototype.
|
||||
* rs6000-tdep.c (read_insn): Add frame param, don't assume big-endian.
|
||||
(ppc_insns_match_pattern): Add frame param. Avoid multiple
|
||||
target mem reads on optional insns.
|
||||
* ppc-linux-tdep.c (ppc_skip_trampoline_code): Update
|
||||
ppc_insns_match_pattern calls.
|
||||
* ppc64-tdep.c (ppc64_standard_linkage2, ppc64_standard_linkage3):
|
||||
Add match for power7 thread safety insns, and new order of
|
||||
std 2,40(1) insn. Correct code shown for _dl_runtime_resolve
|
||||
invocation in comment, and update rest of comment.
|
||||
(PPC64_STANDARD_LINKAGE1_LEN, PPC64_STANDARD_LINKAGE2_LEN,
|
||||
PPC64_STANDARD_LINKAGE3_LEN): Delete.
|
||||
(ppc64_standard_linkage2_target): Update insn offsets.
|
||||
(ppc64_skip_trampoline_code): Use a single insn buffer. Match newer
|
||||
stubs first. Update calls.
|
||||
|
||||
2013-06-04 Yao Qi <yao@codesourcery.com>
|
||||
|
||||
* solib.c (solib_find): Don't need dir separator if path has
|
||||
|
||||
@ -361,7 +361,7 @@ ppc_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
|
||||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||||
CORE_ADDR target = 0;
|
||||
|
||||
if (ppc_insns_match_pattern (pc, powerpc32_plt_stub, insnbuf))
|
||||
if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub, insnbuf))
|
||||
{
|
||||
/* Insn pattern is
|
||||
lis r11, xxxx
|
||||
@ -373,7 +373,7 @@ ppc_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
|
||||
target = read_memory_unsigned_integer (target, 4, byte_order);
|
||||
}
|
||||
|
||||
if (ppc_insns_match_pattern (pc, powerpc32_plt_stub_so, insnbuf))
|
||||
if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub_so, insnbuf))
|
||||
{
|
||||
/* Insn pattern is
|
||||
lwz r11, xxxx(r30)
|
||||
|
||||
@ -300,9 +300,9 @@ struct ppc_insn_pattern
|
||||
int optional; /* If non-zero, this insn may be absent. */
|
||||
};
|
||||
|
||||
extern int ppc_insns_match_pattern (CORE_ADDR pc,
|
||||
extern int ppc_insns_match_pattern (struct frame_info *frame, CORE_ADDR pc,
|
||||
struct ppc_insn_pattern *pattern,
|
||||
unsigned int *insn);
|
||||
unsigned int *insns);
|
||||
extern CORE_ADDR ppc_insn_d_field (unsigned int insn);
|
||||
|
||||
extern CORE_ADDR ppc_insn_ds_field (unsigned int insn);
|
||||
|
||||
140
gdb/ppc64-tdep.c
140
gdb/ppc64-tdep.c
@ -59,9 +59,10 @@ ppc64_desc_entry_point (struct gdbarch *gdbarch, CORE_ADDR desc)
|
||||
return (CORE_ADDR) read_memory_unsigned_integer (desc, 8, byte_order);
|
||||
}
|
||||
|
||||
/* Pattern for the standard linkage function. These are built by
|
||||
build_plt_stub in elf64-ppc.c, whose GLINK argument is always
|
||||
zero. */
|
||||
/* Patterns for the standard linkage functions. These are built by
|
||||
build_plt_stub in bfd/elf64-ppc.c. */
|
||||
|
||||
/* Old PLT call stub. */
|
||||
|
||||
static struct ppc_insn_pattern ppc64_standard_linkage1[] =
|
||||
{
|
||||
@ -95,15 +96,23 @@ static struct ppc_insn_pattern ppc64_standard_linkage1[] =
|
||||
{ 0, 0, 0 }
|
||||
};
|
||||
|
||||
#define PPC64_STANDARD_LINKAGE1_LEN ARRAY_SIZE (ppc64_standard_linkage1)
|
||||
/* Current PLT call stub to access PLT entries more than +/- 32k from r2.
|
||||
Also supports older stub with different placement of std 2,40(1),
|
||||
a stub that omits the std 2,40(1), and both versions of power7
|
||||
thread safety read barriers. Note that there are actually two more
|
||||
instructions following "cmpldi r2, 0", "bnectr+" and "b <glink_i>",
|
||||
but there isn't any need to match them. */
|
||||
|
||||
static struct ppc_insn_pattern ppc64_standard_linkage2[] =
|
||||
{
|
||||
/* std r2, 40(r1) <optional> */
|
||||
{ -1, insn_ds (62, 2, 1, 40, 0), 1 },
|
||||
|
||||
/* addis r12, r2, <any> */
|
||||
{ insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 },
|
||||
|
||||
/* std r2, 40(r1) */
|
||||
{ -1, insn_ds (62, 2, 1, 40, 0), 0 },
|
||||
/* std r2, 40(r1) <optional> */
|
||||
{ -1, insn_ds (62, 2, 1, 40, 0), 1 },
|
||||
|
||||
/* ld r11, <any>(r12) */
|
||||
{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 },
|
||||
@ -114,24 +123,33 @@ static struct ppc_insn_pattern ppc64_standard_linkage2[] =
|
||||
/* mtctr r11 */
|
||||
{ insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
|
||||
|
||||
/* xor r11, r11, r11 <optional> */
|
||||
{ -1, 0x7d6b5a78, 1 },
|
||||
|
||||
/* add r12, r12, r11 <optional> */
|
||||
{ -1, 0x7d8c5a14, 1 },
|
||||
|
||||
/* ld r2, <any>(r12) */
|
||||
{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 },
|
||||
|
||||
/* ld r11, <any>(r12) <optional> */
|
||||
{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 1 },
|
||||
|
||||
/* bctr */
|
||||
{ -1, 0x4e800420, 0 },
|
||||
/* bctr <optional> */
|
||||
{ -1, 0x4e800420, 1 },
|
||||
|
||||
/* cmpldi r2, 0 <optional> */
|
||||
{ -1, 0x28220000, 1 },
|
||||
|
||||
{ 0, 0, 0 }
|
||||
};
|
||||
|
||||
#define PPC64_STANDARD_LINKAGE2_LEN ARRAY_SIZE (ppc64_standard_linkage2)
|
||||
/* Current PLT call stub to access PLT entries within +/- 32k of r2. */
|
||||
|
||||
static struct ppc_insn_pattern ppc64_standard_linkage3[] =
|
||||
{
|
||||
/* std r2, 40(r1) */
|
||||
{ -1, insn_ds (62, 2, 1, 40, 0), 0 },
|
||||
/* std r2, 40(r1) <optional> */
|
||||
{ -1, insn_ds (62, 2, 1, 40, 0), 1 },
|
||||
|
||||
/* ld r11, <any>(r2) */
|
||||
{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 },
|
||||
@ -142,56 +160,71 @@ static struct ppc_insn_pattern ppc64_standard_linkage3[] =
|
||||
/* mtctr r11 */
|
||||
{ insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
|
||||
|
||||
/* xor r11, r11, r11 <optional> */
|
||||
{ -1, 0x7d6b5a78, 1 },
|
||||
|
||||
/* add r2, r2, r11 <optional> */
|
||||
{ -1, 0x7c425a14, 1 },
|
||||
|
||||
/* ld r11, <any>(r2) <optional> */
|
||||
{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 1 },
|
||||
|
||||
/* ld r2, <any>(r2) */
|
||||
{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 2, 0, 0), 0 },
|
||||
|
||||
/* bctr */
|
||||
{ -1, 0x4e800420, 0 },
|
||||
/* bctr <optional> */
|
||||
{ -1, 0x4e800420, 1 },
|
||||
|
||||
/* cmpldi r2, 0 <optional> */
|
||||
{ -1, 0x28220000, 1 },
|
||||
|
||||
{ 0, 0, 0 }
|
||||
};
|
||||
|
||||
#define PPC64_STANDARD_LINKAGE3_LEN ARRAY_SIZE (ppc64_standard_linkage3)
|
||||
|
||||
/* When the dynamic linker is doing lazy symbol resolution, the first
|
||||
call to a function in another object will go like this:
|
||||
|
||||
- The user's function calls the linkage function:
|
||||
|
||||
100007c4: 4b ff fc d5 bl 10000498
|
||||
100007c8: e8 41 00 28 ld r2,40(r1)
|
||||
100003d4: 4b ff ff ad bl 10000380 <nnnn.plt_call.printf>
|
||||
100003d8: e8 41 00 28 ld r2,40(r1)
|
||||
|
||||
- The linkage function loads the entry point (and other stuff) from
|
||||
the function descriptor in the PLT, and jumps to it:
|
||||
- The linkage function loads the entry point and toc pointer from
|
||||
the function descriptor in the PLT, and jumps to it:
|
||||
|
||||
10000498: 3d 82 00 00 addis r12,r2,0
|
||||
1000049c: f8 41 00 28 std r2,40(r1)
|
||||
100004a0: e9 6c 80 98 ld r11,-32616(r12)
|
||||
100004a4: e8 4c 80 a0 ld r2,-32608(r12)
|
||||
100004a8: 7d 69 03 a6 mtctr r11
|
||||
100004ac: e9 6c 80 a8 ld r11,-32600(r12)
|
||||
100004b0: 4e 80 04 20 bctr
|
||||
<nnnn.plt_call.printf>:
|
||||
10000380: f8 41 00 28 std r2,40(r1)
|
||||
10000384: e9 62 80 78 ld r11,-32648(r2)
|
||||
10000388: 7d 69 03 a6 mtctr r11
|
||||
1000038c: e8 42 80 80 ld r2,-32640(r2)
|
||||
10000390: 28 22 00 00 cmpldi r2,0
|
||||
10000394: 4c e2 04 20 bnectr+
|
||||
10000398: 48 00 03 a0 b 10000738 <printf@plt>
|
||||
|
||||
- But since this is the first time that PLT entry has been used, it
|
||||
sends control to its glink entry. That loads the number of the
|
||||
PLT entry and jumps to the common glink0 code:
|
||||
sends control to its glink entry. That loads the number of the
|
||||
PLT entry and jumps to the common glink0 code:
|
||||
|
||||
10000c98: 38 00 00 00 li r0,0
|
||||
10000c9c: 4b ff ff dc b 10000c78
|
||||
<printf@plt>:
|
||||
10000738: 38 00 00 01 li r0,1
|
||||
1000073c: 4b ff ff bc b 100006f8 <__glink_PLTresolve>
|
||||
|
||||
- The common glink0 code then transfers control to the dynamic
|
||||
linker's fixup code:
|
||||
linker's fixup code:
|
||||
|
||||
10000c78: e8 41 00 28 ld r2,40(r1)
|
||||
10000c7c: 3d 82 00 00 addis r12,r2,0
|
||||
10000c80: e9 6c 80 80 ld r11,-32640(r12)
|
||||
10000c84: e8 4c 80 88 ld r2,-32632(r12)
|
||||
10000c88: 7d 69 03 a6 mtctr r11
|
||||
10000c8c: e9 6c 80 90 ld r11,-32624(r12)
|
||||
10000c90: 4e 80 04 20 bctr
|
||||
100006f0: 0000000000010440 .quad plt0 - (. + 16)
|
||||
<__glink_PLTresolve>:
|
||||
100006f8: 7d 88 02 a6 mflr r12
|
||||
100006fc: 42 9f 00 05 bcl 20,4*cr7+so,10000700
|
||||
10000700: 7d 68 02 a6 mflr r11
|
||||
10000704: e8 4b ff f0 ld r2,-16(r11)
|
||||
10000708: 7d 88 03 a6 mtlr r12
|
||||
1000070c: 7d 82 5a 14 add r12,r2,r11
|
||||
10000710: e9 6c 00 00 ld r11,0(r12)
|
||||
10000714: e8 4c 00 08 ld r2,8(r12)
|
||||
10000718: 7d 69 03 a6 mtctr r11
|
||||
1000071c: e9 6c 00 10 ld r11,16(r12)
|
||||
10000720: 4e 80 04 20 bctr
|
||||
|
||||
Eventually, this code will figure out how to skip all of this,
|
||||
including the dynamic linker. At the moment, we just get through
|
||||
@ -234,8 +267,8 @@ ppc64_standard_linkage2_target (struct frame_info *frame,
|
||||
CORE_ADDR desc
|
||||
= ((CORE_ADDR) get_frame_register_unsigned (frame,
|
||||
tdep->ppc_gp0_regnum + 2)
|
||||
+ (ppc_insn_d_field (insn[0]) << 16)
|
||||
+ ppc_insn_ds_field (insn[2]));
|
||||
+ (ppc_insn_d_field (insn[1]) << 16)
|
||||
+ ppc_insn_ds_field (insn[3]));
|
||||
|
||||
/* The first word of the descriptor is the entry point. Return that. */
|
||||
return ppc64_desc_entry_point (gdbarch, desc);
|
||||
@ -266,23 +299,20 @@ ppc64_standard_linkage3_target (struct frame_info *frame,
|
||||
CORE_ADDR
|
||||
ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
|
||||
{
|
||||
unsigned int ppc64_standard_linkage1_insn[PPC64_STANDARD_LINKAGE1_LEN];
|
||||
unsigned int ppc64_standard_linkage2_insn[PPC64_STANDARD_LINKAGE2_LEN];
|
||||
unsigned int ppc64_standard_linkage3_insn[PPC64_STANDARD_LINKAGE3_LEN];
|
||||
#define MAX(a,b) ((a) > (b) ? (a) : (b))
|
||||
unsigned int insns[MAX (MAX (ARRAY_SIZE (ppc64_standard_linkage1),
|
||||
ARRAY_SIZE (ppc64_standard_linkage2)),
|
||||
ARRAY_SIZE (ppc64_standard_linkage3)) - 1];
|
||||
CORE_ADDR target;
|
||||
|
||||
if (ppc_insns_match_pattern (pc, ppc64_standard_linkage1,
|
||||
ppc64_standard_linkage1_insn))
|
||||
pc = ppc64_standard_linkage1_target (frame, pc,
|
||||
ppc64_standard_linkage1_insn);
|
||||
else if (ppc_insns_match_pattern (pc, ppc64_standard_linkage2,
|
||||
ppc64_standard_linkage2_insn))
|
||||
pc = ppc64_standard_linkage2_target (frame, pc,
|
||||
ppc64_standard_linkage2_insn);
|
||||
else if (ppc_insns_match_pattern (pc, ppc64_standard_linkage3,
|
||||
ppc64_standard_linkage3_insn))
|
||||
pc = ppc64_standard_linkage3_target (frame, pc,
|
||||
ppc64_standard_linkage3_insn);
|
||||
if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage3, insns)
|
||||
&& (insns[8] != 0 || insns[9] != 0))
|
||||
pc = ppc64_standard_linkage3_target (frame, pc, insns);
|
||||
else if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage2, insns)
|
||||
&& (insns[10] != 0 || insns[11] != 0))
|
||||
pc = ppc64_standard_linkage2_target (frame, pc, insns);
|
||||
else if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage1, insns))
|
||||
pc = ppc64_standard_linkage1_target (frame, pc, insns);
|
||||
else
|
||||
return 0;
|
||||
|
||||
|
||||
@ -4238,14 +4238,15 @@ show_powerpc_exact_watchpoints (struct ui_file *file, int from_tty,
|
||||
fprintf_filtered (file, _("Use of exact watchpoints is %s.\n"), value);
|
||||
}
|
||||
|
||||
/* Read a PPC instruction from memory. PPC instructions are always
|
||||
big-endian, no matter what endianness the program is running in, so
|
||||
we can hardcode BFD_ENDIAN_BIG for read_memory_unsigned_integer. */
|
||||
/* Read a PPC instruction from memory. */
|
||||
|
||||
static unsigned int
|
||||
read_insn (CORE_ADDR pc)
|
||||
read_insn (struct frame_info *frame, CORE_ADDR pc)
|
||||
{
|
||||
return read_memory_unsigned_integer (pc, 4, BFD_ENDIAN_BIG);
|
||||
struct gdbarch *gdbarch = get_frame_arch (frame);
|
||||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||||
|
||||
return read_memory_unsigned_integer (pc, 4, byte_order);
|
||||
}
|
||||
|
||||
/* Return non-zero if the instructions at PC match the series
|
||||
@ -4262,19 +4263,25 @@ read_insn (CORE_ADDR pc)
|
||||
i'th instruction in memory. */
|
||||
|
||||
int
|
||||
ppc_insns_match_pattern (CORE_ADDR pc, struct ppc_insn_pattern *pattern,
|
||||
unsigned int *insn)
|
||||
ppc_insns_match_pattern (struct frame_info *frame, CORE_ADDR pc,
|
||||
struct ppc_insn_pattern *pattern,
|
||||
unsigned int *insns)
|
||||
{
|
||||
int i;
|
||||
unsigned int insn;
|
||||
|
||||
for (i = 0; pattern[i].mask; i++)
|
||||
for (i = 0, insn = 0; pattern[i].mask; i++)
|
||||
{
|
||||
insn[i] = read_insn (pc);
|
||||
if ((insn[i] & pattern[i].mask) == pattern[i].data)
|
||||
pc += 4;
|
||||
else if (pattern[i].optional)
|
||||
insn[i] = 0;
|
||||
else
|
||||
if (insn == 0)
|
||||
insn = read_insn (frame, pc);
|
||||
insns[i] = 0;
|
||||
if ((insn & pattern[i].mask) == pattern[i].data)
|
||||
{
|
||||
insns[i] = insn;
|
||||
pc += 4;
|
||||
insn = 0;
|
||||
}
|
||||
else if (!pattern[i].optional)
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user