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348 lines
13 KiB
348 lines
13 KiB
commit 845d47080b7d7e068e4ec3d11fe6e27b403ac6e3 |
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Author: Alan Modra <amodra@gmail.com> |
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Date: Tue Jun 4 02:44:35 2013 +0000 |
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* ppc-tdep.h (ppc_insns_match_pattern): Update prototype. |
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* rs6000-tdep.c (read_insn): Add frame param, don't assume big-endian. |
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(ppc_insns_match_pattern): Add frame param. Avoid multiple |
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target mem reads on optional insns. |
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* ppc-linux-tdep.c (ppc_skip_trampoline_code): Update |
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ppc_insns_match_pattern calls. |
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* ppc64-tdep.c (ppc64_standard_linkage2, ppc64_standard_linkage3): |
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Add match for power7 thread safety insns, and new order of |
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std 2,40(1) insn. Correct code shown for _dl_runtime_resolve |
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invocation in comment, and update rest of comment. |
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(PPC64_STANDARD_LINKAGE1_LEN, PPC64_STANDARD_LINKAGE2_LEN, |
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PPC64_STANDARD_LINKAGE3_LEN): Delete. |
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(ppc64_standard_linkage2_target): Update insn offsets. |
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(ppc64_skip_trampoline_code): Use a single insn buffer. Match newer |
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stubs first. Update calls. |
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Index: gdb-7.6.1/gdb/ppc-linux-tdep.c |
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=================================================================== |
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--- gdb-7.6.1.orig/gdb/ppc-linux-tdep.c |
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+++ gdb-7.6.1/gdb/ppc-linux-tdep.c |
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@@ -360,7 +360,7 @@ ppc_skip_trampoline_code (struct frame_i |
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
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CORE_ADDR target = 0; |
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- if (ppc_insns_match_pattern (pc, powerpc32_plt_stub, insnbuf)) |
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+ if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub, insnbuf)) |
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{ |
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/* Insn pattern is |
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lis r11, xxxx |
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@@ -372,7 +372,7 @@ ppc_skip_trampoline_code (struct frame_i |
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target = read_memory_unsigned_integer (target, 4, byte_order); |
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} |
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- if (ppc_insns_match_pattern (pc, powerpc32_plt_stub_so, insnbuf)) |
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+ if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub_so, insnbuf)) |
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{ |
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/* Insn pattern is |
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lwz r11, xxxx(r30) |
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Index: gdb-7.6.1/gdb/ppc-tdep.h |
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=================================================================== |
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--- gdb-7.6.1.orig/gdb/ppc-tdep.h |
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+++ gdb-7.6.1/gdb/ppc-tdep.h |
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@@ -300,9 +300,9 @@ struct ppc_insn_pattern |
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int optional; /* If non-zero, this insn may be absent. */ |
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}; |
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-extern int ppc_insns_match_pattern (CORE_ADDR pc, |
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+extern int ppc_insns_match_pattern (struct frame_info *frame, CORE_ADDR pc, |
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struct ppc_insn_pattern *pattern, |
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- unsigned int *insn); |
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+ unsigned int *insns); |
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extern CORE_ADDR ppc_insn_d_field (unsigned int insn); |
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extern CORE_ADDR ppc_insn_ds_field (unsigned int insn); |
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Index: gdb-7.6.1/gdb/ppc64-tdep.c |
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=================================================================== |
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--- gdb-7.6.1.orig/gdb/ppc64-tdep.c |
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+++ gdb-7.6.1/gdb/ppc64-tdep.c |
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@@ -59,9 +59,10 @@ ppc64_desc_entry_point (struct gdbarch * |
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return (CORE_ADDR) read_memory_unsigned_integer (desc, 8, byte_order); |
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} |
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-/* Pattern for the standard linkage function. These are built by |
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- build_plt_stub in elf64-ppc.c, whose GLINK argument is always |
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- zero. */ |
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+/* Patterns for the standard linkage functions. These are built by |
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+ build_plt_stub in bfd/elf64-ppc.c. */ |
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+ |
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+/* Old PLT call stub. */ |
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static struct ppc_insn_pattern ppc64_standard_linkage1[] = |
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{ |
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@@ -95,15 +96,23 @@ static struct ppc_insn_pattern ppc64_sta |
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{ 0, 0, 0 } |
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}; |
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-#define PPC64_STANDARD_LINKAGE1_LEN ARRAY_SIZE (ppc64_standard_linkage1) |
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+/* Current PLT call stub to access PLT entries more than +/- 32k from r2. |
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+ Also supports older stub with different placement of std 2,40(1), |
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+ a stub that omits the std 2,40(1), and both versions of power7 |
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+ thread safety read barriers. Note that there are actually two more |
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+ instructions following "cmpldi r2, 0", "bnectr+" and "b <glink_i>", |
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+ but there isn't any need to match them. */ |
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static struct ppc_insn_pattern ppc64_standard_linkage2[] = |
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{ |
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+ /* std r2, 40(r1) <optional> */ |
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+ { -1, insn_ds (62, 2, 1, 40, 0), 1 }, |
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+ |
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/* addis r12, r2, <any> */ |
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{ insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 }, |
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- /* std r2, 40(r1) */ |
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- { -1, insn_ds (62, 2, 1, 40, 0), 0 }, |
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+ /* std r2, 40(r1) <optional> */ |
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+ { -1, insn_ds (62, 2, 1, 40, 0), 1 }, |
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/* ld r11, <any>(r12) */ |
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, |
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@@ -114,24 +123,33 @@ static struct ppc_insn_pattern ppc64_sta |
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/* mtctr r11 */ |
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{ insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, |
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+ /* xor r11, r11, r11 <optional> */ |
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+ { -1, 0x7d6b5a78, 1 }, |
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+ |
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+ /* add r12, r12, r11 <optional> */ |
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+ { -1, 0x7d8c5a14, 1 }, |
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+ |
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/* ld r2, <any>(r12) */ |
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 }, |
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/* ld r11, <any>(r12) <optional> */ |
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 1 }, |
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- /* bctr */ |
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- { -1, 0x4e800420, 0 }, |
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+ /* bctr <optional> */ |
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+ { -1, 0x4e800420, 1 }, |
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+ |
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+ /* cmpldi r2, 0 <optional> */ |
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+ { -1, 0x28220000, 1 }, |
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{ 0, 0, 0 } |
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}; |
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-#define PPC64_STANDARD_LINKAGE2_LEN ARRAY_SIZE (ppc64_standard_linkage2) |
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+/* Current PLT call stub to access PLT entries within +/- 32k of r2. */ |
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static struct ppc_insn_pattern ppc64_standard_linkage3[] = |
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{ |
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- /* std r2, 40(r1) */ |
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- { -1, insn_ds (62, 2, 1, 40, 0), 0 }, |
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+ /* std r2, 40(r1) <optional> */ |
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+ { -1, insn_ds (62, 2, 1, 40, 0), 1 }, |
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/* ld r11, <any>(r2) */ |
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 }, |
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@@ -142,56 +160,71 @@ static struct ppc_insn_pattern ppc64_sta |
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/* mtctr r11 */ |
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{ insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, |
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+ /* xor r11, r11, r11 <optional> */ |
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+ { -1, 0x7d6b5a78, 1 }, |
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+ |
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+ /* add r2, r2, r11 <optional> */ |
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+ { -1, 0x7c425a14, 1 }, |
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+ |
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/* ld r11, <any>(r2) <optional> */ |
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 1 }, |
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/* ld r2, <any>(r2) */ |
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 2, 0, 0), 0 }, |
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- /* bctr */ |
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- { -1, 0x4e800420, 0 }, |
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+ /* bctr <optional> */ |
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+ { -1, 0x4e800420, 1 }, |
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+ |
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+ /* cmpldi r2, 0 <optional> */ |
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+ { -1, 0x28220000, 1 }, |
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{ 0, 0, 0 } |
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}; |
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-#define PPC64_STANDARD_LINKAGE3_LEN ARRAY_SIZE (ppc64_standard_linkage3) |
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- |
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/* When the dynamic linker is doing lazy symbol resolution, the first |
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call to a function in another object will go like this: |
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- The user's function calls the linkage function: |
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- 100007c4: 4b ff fc d5 bl 10000498 |
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- 100007c8: e8 41 00 28 ld r2,40(r1) |
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+ 100003d4: 4b ff ff ad bl 10000380 <nnnn.plt_call.printf> |
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+ 100003d8: e8 41 00 28 ld r2,40(r1) |
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- - The linkage function loads the entry point (and other stuff) from |
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- the function descriptor in the PLT, and jumps to it: |
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+ - The linkage function loads the entry point and toc pointer from |
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+ the function descriptor in the PLT, and jumps to it: |
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- 10000498: 3d 82 00 00 addis r12,r2,0 |
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- 1000049c: f8 41 00 28 std r2,40(r1) |
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- 100004a0: e9 6c 80 98 ld r11,-32616(r12) |
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- 100004a4: e8 4c 80 a0 ld r2,-32608(r12) |
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- 100004a8: 7d 69 03 a6 mtctr r11 |
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- 100004ac: e9 6c 80 a8 ld r11,-32600(r12) |
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- 100004b0: 4e 80 04 20 bctr |
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+ <nnnn.plt_call.printf>: |
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+ 10000380: f8 41 00 28 std r2,40(r1) |
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+ 10000384: e9 62 80 78 ld r11,-32648(r2) |
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+ 10000388: 7d 69 03 a6 mtctr r11 |
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+ 1000038c: e8 42 80 80 ld r2,-32640(r2) |
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+ 10000390: 28 22 00 00 cmpldi r2,0 |
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+ 10000394: 4c e2 04 20 bnectr+ |
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+ 10000398: 48 00 03 a0 b 10000738 <printf@plt> |
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- But since this is the first time that PLT entry has been used, it |
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- sends control to its glink entry. That loads the number of the |
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- PLT entry and jumps to the common glink0 code: |
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+ sends control to its glink entry. That loads the number of the |
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+ PLT entry and jumps to the common glink0 code: |
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- 10000c98: 38 00 00 00 li r0,0 |
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- 10000c9c: 4b ff ff dc b 10000c78 |
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+ <printf@plt>: |
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+ 10000738: 38 00 00 01 li r0,1 |
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+ 1000073c: 4b ff ff bc b 100006f8 <__glink_PLTresolve> |
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- The common glink0 code then transfers control to the dynamic |
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- linker's fixup code: |
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+ linker's fixup code: |
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- 10000c78: e8 41 00 28 ld r2,40(r1) |
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- 10000c7c: 3d 82 00 00 addis r12,r2,0 |
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- 10000c80: e9 6c 80 80 ld r11,-32640(r12) |
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- 10000c84: e8 4c 80 88 ld r2,-32632(r12) |
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- 10000c88: 7d 69 03 a6 mtctr r11 |
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- 10000c8c: e9 6c 80 90 ld r11,-32624(r12) |
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- 10000c90: 4e 80 04 20 bctr |
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+ 100006f0: 0000000000010440 .quad plt0 - (. + 16) |
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+ <__glink_PLTresolve>: |
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+ 100006f8: 7d 88 02 a6 mflr r12 |
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+ 100006fc: 42 9f 00 05 bcl 20,4*cr7+so,10000700 |
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+ 10000700: 7d 68 02 a6 mflr r11 |
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+ 10000704: e8 4b ff f0 ld r2,-16(r11) |
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+ 10000708: 7d 88 03 a6 mtlr r12 |
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+ 1000070c: 7d 82 5a 14 add r12,r2,r11 |
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+ 10000710: e9 6c 00 00 ld r11,0(r12) |
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+ 10000714: e8 4c 00 08 ld r2,8(r12) |
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+ 10000718: 7d 69 03 a6 mtctr r11 |
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+ 1000071c: e9 6c 00 10 ld r11,16(r12) |
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+ 10000720: 4e 80 04 20 bctr |
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Eventually, this code will figure out how to skip all of this, |
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including the dynamic linker. At the moment, we just get through |
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@@ -234,8 +267,8 @@ ppc64_standard_linkage2_target (struct f |
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CORE_ADDR desc |
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= ((CORE_ADDR) get_frame_register_unsigned (frame, |
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tdep->ppc_gp0_regnum + 2) |
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- + (ppc_insn_d_field (insn[0]) << 16) |
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- + ppc_insn_ds_field (insn[2])); |
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+ + (ppc_insn_d_field (insn[1]) << 16) |
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+ + ppc_insn_ds_field (insn[3])); |
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/* The first word of the descriptor is the entry point. Return that. */ |
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return ppc64_desc_entry_point (gdbarch, desc); |
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@@ -266,23 +299,20 @@ ppc64_standard_linkage3_target (struct f |
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CORE_ADDR |
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ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
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{ |
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- unsigned int ppc64_standard_linkage1_insn[PPC64_STANDARD_LINKAGE1_LEN]; |
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- unsigned int ppc64_standard_linkage2_insn[PPC64_STANDARD_LINKAGE2_LEN]; |
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- unsigned int ppc64_standard_linkage3_insn[PPC64_STANDARD_LINKAGE3_LEN]; |
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+#define MAX(a,b) ((a) > (b) ? (a) : (b)) |
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+ unsigned int insns[MAX (MAX (ARRAY_SIZE (ppc64_standard_linkage1), |
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+ ARRAY_SIZE (ppc64_standard_linkage2)), |
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+ ARRAY_SIZE (ppc64_standard_linkage3)) - 1]; |
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CORE_ADDR target; |
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- if (ppc_insns_match_pattern (pc, ppc64_standard_linkage1, |
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- ppc64_standard_linkage1_insn)) |
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- pc = ppc64_standard_linkage1_target (frame, pc, |
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- ppc64_standard_linkage1_insn); |
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- else if (ppc_insns_match_pattern (pc, ppc64_standard_linkage2, |
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- ppc64_standard_linkage2_insn)) |
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- pc = ppc64_standard_linkage2_target (frame, pc, |
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- ppc64_standard_linkage2_insn); |
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- else if (ppc_insns_match_pattern (pc, ppc64_standard_linkage3, |
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- ppc64_standard_linkage3_insn)) |
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- pc = ppc64_standard_linkage3_target (frame, pc, |
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- ppc64_standard_linkage3_insn); |
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+ if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage3, insns) |
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+ && (insns[8] != 0 || insns[9] != 0)) |
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+ pc = ppc64_standard_linkage3_target (frame, pc, insns); |
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+ else if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage2, insns) |
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+ && (insns[10] != 0 || insns[11] != 0)) |
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+ pc = ppc64_standard_linkage2_target (frame, pc, insns); |
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+ else if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage1, insns)) |
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+ pc = ppc64_standard_linkage1_target (frame, pc, insns); |
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else |
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return 0; |
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Index: gdb-7.6.1/gdb/rs6000-tdep.c |
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=================================================================== |
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--- gdb-7.6.1.orig/gdb/rs6000-tdep.c |
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+++ gdb-7.6.1/gdb/rs6000-tdep.c |
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@@ -4289,14 +4289,15 @@ show_powerpc_exact_watchpoints (struct u |
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fprintf_filtered (file, _("Use of exact watchpoints is %s.\n"), value); |
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} |
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-/* Read a PPC instruction from memory. PPC instructions are always |
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- big-endian, no matter what endianness the program is running in, so |
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- we can hardcode BFD_ENDIAN_BIG for read_memory_unsigned_integer. */ |
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+/* Read a PPC instruction from memory. */ |
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static unsigned int |
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-read_insn (CORE_ADDR pc) |
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+read_insn (struct frame_info *frame, CORE_ADDR pc) |
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{ |
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- return read_memory_unsigned_integer (pc, 4, BFD_ENDIAN_BIG); |
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+ struct gdbarch *gdbarch = get_frame_arch (frame); |
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+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
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+ |
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+ return read_memory_unsigned_integer (pc, 4, byte_order); |
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} |
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/* Return non-zero if the instructions at PC match the series |
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@@ -4313,19 +4314,25 @@ read_insn (CORE_ADDR pc) |
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i'th instruction in memory. */ |
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int |
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-ppc_insns_match_pattern (CORE_ADDR pc, struct ppc_insn_pattern *pattern, |
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- unsigned int *insn) |
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+ppc_insns_match_pattern (struct frame_info *frame, CORE_ADDR pc, |
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+ struct ppc_insn_pattern *pattern, |
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+ unsigned int *insns) |
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{ |
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int i; |
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+ unsigned int insn; |
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- for (i = 0; pattern[i].mask; i++) |
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+ for (i = 0, insn = 0; pattern[i].mask; i++) |
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{ |
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- insn[i] = read_insn (pc); |
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- if ((insn[i] & pattern[i].mask) == pattern[i].data) |
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- pc += 4; |
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- else if (pattern[i].optional) |
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- insn[i] = 0; |
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- else |
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+ if (insn == 0) |
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+ insn = read_insn (frame, pc); |
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+ insns[i] = 0; |
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+ if ((insn & pattern[i].mask) == pattern[i].data) |
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+ { |
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+ insns[i] = insn; |
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+ pc += 4; |
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+ insn = 0; |
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+ } |
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+ else if (!pattern[i].optional) |
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return 0; |
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} |
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