mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2025-02-05 00:36:22 +00:00
* server.h (struct emit_ops): Add compare-goto fields.
* tracepoint.c (gdb_agent_op_sizes): New table. (emit_eq_goto): New function. (emit_ne_goto): New function. (emit_lt_goto): New function. (emit_le_goto): New function. (emit_gt_goto): New function. (emit_ge_goto): New function. (is_goto_target): New function. (compile_bytecodes): Recognize special cases of compare-goto combinations and call specialized emitters for them. * linux-x86-low.c (amd64_emit_eq_goto): New function. (amd64_emit_ne_goto): New function. (amd64_emit_lt_goto): New function. (amd64_emit_le_goto): New function. (amd64_emit_gt_goto): New function. (amd64_emit_ge_goto): New function. (amd64_emit_ops): Add the new functions. (i386_emit_eq_goto): New function. (i386_emit_ne_goto): New function. (i386_emit_lt_goto): New function. (i386_emit_le_goto): New function. (i386_emit_gt_goto): New function. (i386_emit_ge_goto): New function. (i386_emit_ops): Add the new functions.
This commit is contained in:
Stan Shebs
parent
5af65ec072
commit
6b9801d456
@ -1,3 +1,31 @@
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2011-09-15 Stan Shebs <stan@codesourcery.com>
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* server.h (struct emit_ops): Add compare-goto fields.
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* tracepoint.c (gdb_agent_op_sizes): New table.
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(emit_eq_goto): New function.
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(emit_ne_goto): New function.
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(emit_lt_goto): New function.
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(emit_le_goto): New function.
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(emit_gt_goto): New function.
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(emit_ge_goto): New function.
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(is_goto_target): New function.
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(compile_bytecodes): Recognize special cases of compare-goto
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combinations and call specialized emitters for them.
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* linux-x86-low.c (amd64_emit_eq_goto): New function.
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(amd64_emit_ne_goto): New function.
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(amd64_emit_lt_goto): New function.
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(amd64_emit_le_goto): New function.
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(amd64_emit_gt_goto): New function.
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(amd64_emit_ge_goto): New function.
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(amd64_emit_ops): Add the new functions.
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(i386_emit_eq_goto): New function.
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(i386_emit_ne_goto): New function.
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(i386_emit_lt_goto): New function.
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(i386_emit_le_goto): New function.
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(i386_emit_gt_goto): New function.
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(i386_emit_ge_goto): New function.
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(i386_emit_ops): Add the new functions.
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2011-09-08 Stan Shebs <stan@codesourcery.com>
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* linux-x86-low.c (i386_emit_prologue): Save %ebx.
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@ -1993,6 +1993,127 @@ amd64_emit_void_call_2 (CORE_ADDR fn, int arg1)
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"pop %rax");
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}
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void
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amd64_emit_eq_goto (int *offset_p, int *size_p)
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{
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EMIT_ASM (amd64_eq,
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"cmp %rax,(%rsp)\n\t"
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"jne .Lamd64_eq_fallthru\n\t"
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"lea 0x8(%rsp),%rsp\n\t"
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"pop %rax\n\t"
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/* jmp, but don't trust the assembler to choose the right jump */
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".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t"
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".Lamd64_eq_fallthru:\n\t"
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"lea 0x8(%rsp),%rsp\n\t"
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"pop %rax");
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if (offset_p)
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*offset_p = 13;
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if (size_p)
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*size_p = 4;
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}
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void
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amd64_emit_ne_goto (int *offset_p, int *size_p)
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{
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EMIT_ASM (amd64_ne,
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"cmp %rax,(%rsp)\n\t"
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"je .Lamd64_ne_fallthru\n\t"
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"lea 0x8(%rsp),%rsp\n\t"
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"pop %rax\n\t"
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/* jmp, but don't trust the assembler to choose the right jump */
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".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t"
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".Lamd64_ne_fallthru:\n\t"
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"lea 0x8(%rsp),%rsp\n\t"
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"pop %rax");
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if (offset_p)
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*offset_p = 13;
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if (size_p)
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*size_p = 4;
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}
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void
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amd64_emit_lt_goto (int *offset_p, int *size_p)
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{
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EMIT_ASM (amd64_lt,
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"cmp %rax,(%rsp)\n\t"
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"jnl .Lamd64_lt_fallthru\n\t"
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"lea 0x8(%rsp),%rsp\n\t"
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"pop %rax\n\t"
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/* jmp, but don't trust the assembler to choose the right jump */
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".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t"
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".Lamd64_lt_fallthru:\n\t"
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"lea 0x8(%rsp),%rsp\n\t"
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"pop %rax");
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if (offset_p)
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*offset_p = 13;
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if (size_p)
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*size_p = 4;
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}
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void
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amd64_emit_le_goto (int *offset_p, int *size_p)
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{
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EMIT_ASM (amd64_le,
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"cmp %rax,(%rsp)\n\t"
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"jnle .Lamd64_le_fallthru\n\t"
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"lea 0x8(%rsp),%rsp\n\t"
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"pop %rax\n\t"
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/* jmp, but don't trust the assembler to choose the right jump */
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".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t"
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".Lamd64_le_fallthru:\n\t"
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"lea 0x8(%rsp),%rsp\n\t"
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"pop %rax");
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if (offset_p)
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*offset_p = 13;
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if (size_p)
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*size_p = 4;
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}
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void
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amd64_emit_gt_goto (int *offset_p, int *size_p)
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{
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EMIT_ASM (amd64_gt,
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"cmp %rax,(%rsp)\n\t"
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"jng .Lamd64_gt_fallthru\n\t"
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"lea 0x8(%rsp),%rsp\n\t"
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"pop %rax\n\t"
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/* jmp, but don't trust the assembler to choose the right jump */
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".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t"
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".Lamd64_gt_fallthru:\n\t"
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"lea 0x8(%rsp),%rsp\n\t"
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"pop %rax");
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if (offset_p)
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*offset_p = 13;
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if (size_p)
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*size_p = 4;
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}
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void
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amd64_emit_ge_goto (int *offset_p, int *size_p)
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{
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EMIT_ASM (amd64_ge,
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"cmp %rax,(%rsp)\n\t"
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"jnge .Lamd64_ge_fallthru\n\t"
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".Lamd64_ge_jump:\n\t"
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"lea 0x8(%rsp),%rsp\n\t"
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"pop %rax\n\t"
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/* jmp, but don't trust the assembler to choose the right jump */
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".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t"
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".Lamd64_ge_fallthru:\n\t"
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"lea 0x8(%rsp),%rsp\n\t"
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"pop %rax");
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if (offset_p)
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*offset_p = 13;
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if (size_p)
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*size_p = 4;
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}
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struct emit_ops amd64_emit_ops =
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{
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amd64_emit_prologue,
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@ -2025,7 +2146,13 @@ struct emit_ops amd64_emit_ops =
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amd64_emit_swap,
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amd64_emit_stack_adjust,
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amd64_emit_int_call_1,
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amd64_emit_void_call_2
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amd64_emit_void_call_2,
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amd64_emit_eq_goto,
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amd64_emit_ne_goto,
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amd64_emit_lt_goto,
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amd64_emit_le_goto,
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amd64_emit_gt_goto,
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amd64_emit_ge_goto
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};
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#endif /* __x86_64__ */
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@ -2500,6 +2627,162 @@ i386_emit_void_call_2 (CORE_ADDR fn, int arg1)
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"pop %eax");
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}
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void
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i386_emit_eq_goto (int *offset_p, int *size_p)
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{
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EMIT_ASM32 (eq,
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/* Check low half first, more likely to be decider */
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"cmpl %eax,(%esp)\n\t"
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"jne .Leq_fallthru\n\t"
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"cmpl %ebx,4(%esp)\n\t"
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"jne .Leq_fallthru\n\t"
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"lea 0x8(%esp),%esp\n\t"
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"pop %eax\n\t"
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"pop %ebx\n\t"
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/* jmp, but don't trust the assembler to choose the right jump */
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".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t"
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".Leq_fallthru:\n\t"
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"lea 0x8(%esp),%esp\n\t"
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"pop %eax\n\t"
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"pop %ebx");
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if (offset_p)
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*offset_p = 18;
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if (size_p)
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*size_p = 4;
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}
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void
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i386_emit_ne_goto (int *offset_p, int *size_p)
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{
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EMIT_ASM32 (ne,
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/* Check low half first, more likely to be decider */
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"cmpl %eax,(%esp)\n\t"
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"jne .Lne_jump\n\t"
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"cmpl %ebx,4(%esp)\n\t"
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"je .Lne_fallthru\n\t"
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".Lne_jump:\n\t"
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"lea 0x8(%esp),%esp\n\t"
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"pop %eax\n\t"
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"pop %ebx\n\t"
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/* jmp, but don't trust the assembler to choose the right jump */
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".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t"
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".Lne_fallthru:\n\t"
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"lea 0x8(%esp),%esp\n\t"
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"pop %eax\n\t"
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"pop %ebx");
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if (offset_p)
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*offset_p = 18;
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if (size_p)
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*size_p = 4;
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}
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void
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i386_emit_lt_goto (int *offset_p, int *size_p)
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{
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EMIT_ASM32 (lt,
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"cmpl %ebx,4(%esp)\n\t"
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"jl .Llt_jump\n\t"
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"jne .Llt_fallthru\n\t"
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"cmpl %eax,(%esp)\n\t"
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"jnl .Llt_fallthru\n\t"
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".Llt_jump:\n\t"
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"lea 0x8(%esp),%esp\n\t"
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"pop %eax\n\t"
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"pop %ebx\n\t"
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/* jmp, but don't trust the assembler to choose the right jump */
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".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t"
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".Llt_fallthru:\n\t"
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"lea 0x8(%esp),%esp\n\t"
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"pop %eax\n\t"
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"pop %ebx");
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if (offset_p)
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*offset_p = 20;
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if (size_p)
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*size_p = 4;
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}
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void
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i386_emit_le_goto (int *offset_p, int *size_p)
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{
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EMIT_ASM32 (le,
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"cmpl %ebx,4(%esp)\n\t"
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"jle .Lle_jump\n\t"
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"jne .Lle_fallthru\n\t"
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"cmpl %eax,(%esp)\n\t"
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"jnle .Lle_fallthru\n\t"
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".Lle_jump:\n\t"
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"lea 0x8(%esp),%esp\n\t"
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"pop %eax\n\t"
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"pop %ebx\n\t"
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/* jmp, but don't trust the assembler to choose the right jump */
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".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t"
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".Lle_fallthru:\n\t"
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"lea 0x8(%esp),%esp\n\t"
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"pop %eax\n\t"
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"pop %ebx");
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if (offset_p)
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*offset_p = 20;
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if (size_p)
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*size_p = 4;
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}
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void
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i386_emit_gt_goto (int *offset_p, int *size_p)
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{
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EMIT_ASM32 (gt,
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"cmpl %ebx,4(%esp)\n\t"
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"jg .Lgt_jump\n\t"
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"jne .Lgt_fallthru\n\t"
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"cmpl %eax,(%esp)\n\t"
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"jng .Lgt_fallthru\n\t"
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".Lgt_jump:\n\t"
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"lea 0x8(%esp),%esp\n\t"
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"pop %eax\n\t"
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"pop %ebx\n\t"
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/* jmp, but don't trust the assembler to choose the right jump */
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".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t"
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".Lgt_fallthru:\n\t"
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"lea 0x8(%esp),%esp\n\t"
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"pop %eax\n\t"
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"pop %ebx");
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if (offset_p)
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*offset_p = 20;
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if (size_p)
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*size_p = 4;
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}
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void
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i386_emit_ge_goto (int *offset_p, int *size_p)
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{
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EMIT_ASM32 (ge,
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"cmpl %ebx,4(%esp)\n\t"
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"jge .Lge_jump\n\t"
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"jne .Lge_fallthru\n\t"
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"cmpl %eax,(%esp)\n\t"
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"jnge .Lge_fallthru\n\t"
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".Lge_jump:\n\t"
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"lea 0x8(%esp),%esp\n\t"
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"pop %eax\n\t"
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"pop %ebx\n\t"
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/* jmp, but don't trust the assembler to choose the right jump */
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".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t"
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".Lge_fallthru:\n\t"
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"lea 0x8(%esp),%esp\n\t"
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"pop %eax\n\t"
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"pop %ebx");
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if (offset_p)
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*offset_p = 20;
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if (size_p)
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*size_p = 4;
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}
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struct emit_ops i386_emit_ops =
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{
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i386_emit_prologue,
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@ -2532,7 +2815,13 @@ struct emit_ops i386_emit_ops =
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i386_emit_swap,
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i386_emit_stack_adjust,
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i386_emit_int_call_1,
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i386_emit_void_call_2
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i386_emit_void_call_2,
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i386_emit_eq_goto,
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i386_emit_ne_goto,
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i386_emit_lt_goto,
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i386_emit_le_goto,
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i386_emit_gt_goto,
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i386_emit_ge_goto
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};
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@ -538,6 +538,15 @@ struct emit_ops
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argument and a 64-bit int from the top of the stack, and returns
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nothing (for instance, tsv setter). */
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void (*emit_void_call_2) (CORE_ADDR fn, int arg1);
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/* Emit code specialized for common combinations of compare followed
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by a goto. */
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void (*emit_eq_goto) (int *offset_p, int *size_p);
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void (*emit_ne_goto) (int *offset_p, int *size_p);
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void (*emit_lt_goto) (int *offset_p, int *size_p);
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void (*emit_le_goto) (int *offset_p, int *size_p);
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void (*emit_gt_goto) (int *offset_p, int *size_p);
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void (*emit_ge_goto) (int *offset_p, int *size_p);
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};
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/* Returns the address of the get_raw_reg function in the IPA. */
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@ -483,6 +483,14 @@ static const char *gdb_agent_op_names [gdb_agent_op_last] =
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#undef DEFOP
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};
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static const unsigned char gdb_agent_op_sizes [gdb_agent_op_last] =
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{
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0
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#define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) , SIZE
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#include "ax.def"
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#undef DEFOP
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};
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struct agent_expr
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{
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int length;
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@ -5663,6 +5671,42 @@ emit_void_call_2 (CORE_ADDR fn, int arg1)
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target_emit_ops ()->emit_void_call_2 (fn, arg1);
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}
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static void
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emit_eq_goto (int *offset_p, int *size_p)
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{
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target_emit_ops ()->emit_eq_goto (offset_p, size_p);
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}
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static void
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emit_ne_goto (int *offset_p, int *size_p)
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{
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target_emit_ops ()->emit_ne_goto (offset_p, size_p);
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}
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static void
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emit_lt_goto (int *offset_p, int *size_p)
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{
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target_emit_ops ()->emit_lt_goto (offset_p, size_p);
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}
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static void
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emit_ge_goto (int *offset_p, int *size_p)
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{
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target_emit_ops ()->emit_ge_goto (offset_p, size_p);
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}
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static void
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emit_gt_goto (int *offset_p, int *size_p)
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{
|
||||
target_emit_ops ()->emit_gt_goto (offset_p, size_p);
|
||||
}
|
||||
|
||||
static void
|
||||
emit_le_goto (int *offset_p, int *size_p)
|
||||
{
|
||||
target_emit_ops ()->emit_le_goto (offset_p, size_p);
|
||||
}
|
||||
|
||||
static enum eval_result_type compile_bytecodes (struct agent_expr *aexpr);
|
||||
|
||||
static void
|
||||
@ -5712,6 +5756,30 @@ compile_tracepoint_condition (struct tracepoint *tpoint,
|
||||
*jump_entry += 16;
|
||||
}
|
||||
|
||||
/* Scan an agent expression for any evidence that the given PC is the
|
||||
target of a jump bytecode in the expression. */
|
||||
|
||||
int
|
||||
is_goto_target (struct agent_expr *aexpr, int pc)
|
||||
{
|
||||
int i;
|
||||
unsigned char op;
|
||||
|
||||
for (i = 0; i < aexpr->length; i += 1 + gdb_agent_op_sizes[op])
|
||||
{
|
||||
op = aexpr->bytes[i];
|
||||
|
||||
if (op == gdb_agent_op_goto || op == gdb_agent_op_if_goto)
|
||||
{
|
||||
int target = (aexpr->bytes[i + 1] << 8) + aexpr->bytes[i + 2];
|
||||
if (target == pc)
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Given an agent expression, turn it into native code. */
|
||||
|
||||
static enum eval_result_type
|
||||
@ -5719,7 +5787,7 @@ compile_bytecodes (struct agent_expr *aexpr)
|
||||
{
|
||||
int pc = 0;
|
||||
int done = 0;
|
||||
unsigned char op;
|
||||
unsigned char op, next_op;
|
||||
int arg;
|
||||
/* This is only used to build 64-bit value for constants. */
|
||||
ULONGEST top;
|
||||
@ -5831,10 +5899,63 @@ compile_bytecodes (struct agent_expr *aexpr)
|
||||
break;
|
||||
|
||||
case gdb_agent_op_equal:
|
||||
next_op = aexpr->bytes[pc];
|
||||
if (next_op == gdb_agent_op_if_goto
|
||||
&& !is_goto_target (aexpr, pc)
|
||||
&& target_emit_ops ()->emit_eq_goto)
|
||||
{
|
||||
trace_debug ("Combining equal & if_goto");
|
||||
pc += 1;
|
||||
aentry->pc = pc;
|
||||
arg = aexpr->bytes[pc++];
|
||||
arg = (arg << 8) + aexpr->bytes[pc++];
|
||||
aentry->goto_pc = arg;
|
||||
emit_eq_goto (&(aentry->from_offset), &(aentry->from_size));
|
||||
}
|
||||
else if (next_op == gdb_agent_op_log_not
|
||||
&& (aexpr->bytes[pc + 1] == gdb_agent_op_if_goto)
|
||||
&& !is_goto_target (aexpr, pc + 1)
|
||||
&& target_emit_ops ()->emit_ne_goto)
|
||||
{
|
||||
trace_debug ("Combining equal & log_not & if_goto");
|
||||
pc += 2;
|
||||
aentry->pc = pc;
|
||||
arg = aexpr->bytes[pc++];
|
||||
arg = (arg << 8) + aexpr->bytes[pc++];
|
||||
aentry->goto_pc = arg;
|
||||
emit_ne_goto (&(aentry->from_offset), &(aentry->from_size));
|
||||
}
|
||||
else
|
||||
emit_equal ();
|
||||
break;
|
||||
|
||||
case gdb_agent_op_less_signed:
|
||||
next_op = aexpr->bytes[pc];
|
||||
if (next_op == gdb_agent_op_if_goto
|
||||
&& !is_goto_target (aexpr, pc))
|
||||
{
|
||||
trace_debug ("Combining less_signed & if_goto");
|
||||
pc += 1;
|
||||
aentry->pc = pc;
|
||||
arg = aexpr->bytes[pc++];
|
||||
arg = (arg << 8) + aexpr->bytes[pc++];
|
||||
aentry->goto_pc = arg;
|
||||
emit_lt_goto (&(aentry->from_offset), &(aentry->from_size));
|
||||
}
|
||||
else if (next_op == gdb_agent_op_log_not
|
||||
&& !is_goto_target (aexpr, pc)
|
||||
&& (aexpr->bytes[pc + 1] == gdb_agent_op_if_goto)
|
||||
&& !is_goto_target (aexpr, pc + 1))
|
||||
{
|
||||
trace_debug ("Combining less_signed & log_not & if_goto");
|
||||
pc += 2;
|
||||
aentry->pc = pc;
|
||||
arg = aexpr->bytes[pc++];
|
||||
arg = (arg << 8) + aexpr->bytes[pc++];
|
||||
aentry->goto_pc = arg;
|
||||
emit_ge_goto (&(aentry->from_offset), &(aentry->from_size));
|
||||
}
|
||||
else
|
||||
emit_less_signed ();
|
||||
break;
|
||||
|
||||
@ -5946,6 +6067,37 @@ compile_bytecodes (struct agent_expr *aexpr)
|
||||
break;
|
||||
|
||||
case gdb_agent_op_swap:
|
||||
next_op = aexpr->bytes[pc];
|
||||
/* Detect greater-than comparison sequences. */
|
||||
if (next_op == gdb_agent_op_less_signed
|
||||
&& !is_goto_target (aexpr, pc)
|
||||
&& (aexpr->bytes[pc + 1] == gdb_agent_op_if_goto)
|
||||
&& !is_goto_target (aexpr, pc + 1))
|
||||
{
|
||||
trace_debug ("Combining swap & less_signed & if_goto");
|
||||
pc += 2;
|
||||
aentry->pc = pc;
|
||||
arg = aexpr->bytes[pc++];
|
||||
arg = (arg << 8) + aexpr->bytes[pc++];
|
||||
aentry->goto_pc = arg;
|
||||
emit_gt_goto (&(aentry->from_offset), &(aentry->from_size));
|
||||
}
|
||||
else if (next_op == gdb_agent_op_less_signed
|
||||
&& !is_goto_target (aexpr, pc)
|
||||
&& (aexpr->bytes[pc + 1] == gdb_agent_op_log_not)
|
||||
&& !is_goto_target (aexpr, pc + 1)
|
||||
&& (aexpr->bytes[pc + 2] == gdb_agent_op_if_goto)
|
||||
&& !is_goto_target (aexpr, pc + 2))
|
||||
{
|
||||
trace_debug ("Combining swap & less_signed & log_not & if_goto");
|
||||
pc += 3;
|
||||
aentry->pc = pc;
|
||||
arg = aexpr->bytes[pc++];
|
||||
arg = (arg << 8) + aexpr->bytes[pc++];
|
||||
aentry->goto_pc = arg;
|
||||
emit_le_goto (&(aentry->from_offset), &(aentry->from_size));
|
||||
}
|
||||
else
|
||||
emit_swap ();
|
||||
break;
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user