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authorJan Kratochvil <jan.kratochvil@redhat.com>2011-09-08 15:38:16 +0000
committerJan Kratochvil <jan.kratochvil@redhat.com>2011-09-08 15:38:16 +0000
commit08711b9a36344df9e29be436d9f959324fff4f42 (patch)
tree5107fb8d69f110c93e06ce2ce356ee7d4229494a /gdb/amd64-tdep.c
parentb2e7f004c75322ea75cc9326bc6c6f4b6577df7f (diff)
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PR breakpoints/12435 * amd64-tdep.c (amd64_skip_prologue): New variables start_pc_sal, next_sal, buf, offset and xmmreg. Advance PC if it sees the PR. * dwarf2read.c (process_full_comp_unit): Initialize amd64_prologue_line_bug. * symtab.h (struct symtab): New field amd64_prologue_line_bug. gdb/testsuite/ PR breakpoints/12435 * gdb.arch/amd64-prologue-xmm.c: New file. * gdb.arch/amd64-prologue-xmm.exp: New file. * gdb.arch/amd64-prologue-xmm.s: New file.
Diffstat (limited to 'gdb/amd64-tdep.c')
-rw-r--r--gdb/amd64-tdep.c69
1 files changed, 68 insertions, 1 deletions
diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index 051fb13..14be776 100644
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -1917,6 +1917,9 @@ amd64_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc)
{
struct amd64_frame_cache cache;
CORE_ADDR pc;
+ struct symtab_and_line start_pc_sal, next_sal;
+ gdb_byte buf[4 + 8 * 7];
+ int offset, xmmreg;
amd64_init_frame_cache (&cache);
pc = amd64_analyze_prologue (gdbarch, start_pc, 0xffffffffffffffffLL,
@@ -1924,7 +1927,71 @@ amd64_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc)
if (cache.frameless_p)
return start_pc;
- return pc;
+ /* GCC PR debug/48827 produced false prologue end:
+ 84 c0 test %al,%al
+ 74 23 je after
+ <-- here is 0 lines advance - the false prologue end marker.
+ 0f 29 85 70 ff ff ff movaps %xmm0,-0x90(%rbp)
+ 0f 29 4d 80 movaps %xmm1,-0x80(%rbp)
+ 0f 29 55 90 movaps %xmm2,-0x70(%rbp)
+ 0f 29 5d a0 movaps %xmm3,-0x60(%rbp)
+ 0f 29 65 b0 movaps %xmm4,-0x50(%rbp)
+ 0f 29 6d c0 movaps %xmm5,-0x40(%rbp)
+ 0f 29 75 d0 movaps %xmm6,-0x30(%rbp)
+ 0f 29 7d e0 movaps %xmm7,-0x20(%rbp)
+ after: */
+
+ if (pc == start_pc)
+ return pc;
+
+ start_pc_sal = find_pc_sect_line (start_pc, NULL, 0);
+ if (start_pc_sal.symtab == NULL
+ || !start_pc_sal.symtab->amd64_prologue_line_bug
+ || start_pc_sal.pc != start_pc || pc >= start_pc_sal.end)
+ return pc;
+
+ next_sal = find_pc_sect_line (start_pc_sal.end, NULL, 0);
+ if (next_sal.line != start_pc_sal.line)
+ return pc;
+
+ /* START_PC can be from overlayed memory, ignored here. */
+ if (target_read_memory (next_sal.pc - 4, buf, sizeof (buf)) != 0)
+ return pc;
+
+ /* test %al,%al */
+ if (buf[0] != 0x84 || buf[1] != 0xc0)
+ return pc;
+ /* je AFTER */
+ if (buf[2] != 0x74)
+ return pc;
+
+ offset = 4;
+ for (xmmreg = 0; xmmreg < 8; xmmreg++)
+ {
+ /* movaps %xmmreg?,-0x??(%rbp) */
+ if (buf[offset] != 0x0f || buf[offset + 1] != 0x29
+ || (buf[offset + 2] & 0b00111111) != (xmmreg << 3 | 0b101))
+ return pc;
+
+ if ((buf[offset + 2] & 0b11000000) == 0b01000000)
+ {
+ /* 8-bit displacement. */
+ offset += 4;
+ }
+ else if ((buf[offset + 2] & 0b11000000) == 0b10000000)
+ {
+ /* 32-bit displacement. */
+ offset += 7;
+ }
+ else
+ return pc;
+ }
+
+ /* je AFTER */
+ if (offset - 4 != buf[3])
+ return pc;
+
+ return next_sal.end;
}