Uprobe prologue ci #10296
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Uprobe prologue ci #10296
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olsajiri
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It's not used, pt_regs_offset returns only offset to struct pt_regs, not the actual register values. Signed-off-by: Jiri Olsa <[email protected]>
It's not used, get_reg_offset returns only offset to struct pt_regs, not the actual register values. Signed-off-by: Jiri Olsa <[email protected]>
It's not used, insn_get_modrm_rm_off returns only offset to struct pt_regs, not the actual register values. Signed-off-by: Jiri Olsa <[email protected]>
It's not used, insn_get_modrm_reg_off returns only offset to struct pt_regs, not the actual register values. Signed-off-by: Jiri Olsa <[email protected]>
It's not used, get_reg_offset_16 returns only offset to struct pt_regs, not the actual register values. Signed-off-by: Jiri Olsa <[email protected]>
Mov xol data into separate arch_uprobe_xol object so we can hold more of them in following changes. Signed-off-by: Jiri Olsa <[email protected]>
Using struct arch_uprobe_xol also in emulate callback which will help in following changes. Signed-off-by: Jiri Olsa <[email protected]>
Adding support to emulate mov reg to reg instructions, because it's often part of the function prologue. Signed-off-by: Jiri Olsa <[email protected]>
Adding support to emulate sub reg, imm instructions, because it's often part of the function prologue. Signed-off-by: Jiri Olsa <[email protected]>
Adding support to optimize uprobe on top of instructions that can
be emulated.
The idea is to store instructions on underlying 5 bytes and emulate
them during the int3 and uprobe syscall execution:
- install 'call trampoline' through standard int3 update
- if int3 is hit before we finish optimizing we emulate
all underlying instructions
- when call is installed the uprobe syscall will emulate
all underlying instructions
Adding opt_xol_ops that emulate instructions that are replaced
by 5 bytes call instruction used to optimize the uprobe.
Signed-off-by: Jiri Olsa <[email protected]>
Adding test code for mov and sub instructions emulation. TODO add test for sub flags value emulation. Signed-off-by: Jiri Olsa <[email protected]>
Adding test that places uprobe on top of supported prologue and checks that the uprobe gets properly optimized. Signed-off-by: Jiri Olsa <[email protected]>
Adding uprobe race test on top of prologue instructions. Signed-off-by: Jiri Olsa <[email protected]>
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