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3023b15fb1
Detect and support fixed PIC indirect jumps of the following form:
```
movslq En(%rip), %r1
leaq PIC_JUMP_TABLE(%rip), %r2
addq %r2, %r1
jmpq *%r1
```
with PIC_JUMP_TABLE that looks like following:
```
JT: ----------
E1:| L1 - JT |
|----------|
E2:| L2 - JT |
|----------|
| |
......
En:| Ln - JT |
----------
```
The code could be produced by compilers, see
https://github.com/llvm/llvm-project/issues/91648.
Test Plan: updated jump-table-fixed-ref-pic.test
Reviewers: maksfb, ayermolo, dcci, rafaelauler
Reviewed By: rafaelauler
Pull Request: https://github.com/llvm/llvm-project/pull/91667
14 lines
544 B
Plaintext
14 lines
544 B
Plaintext
## Verify that BOLT detects fixed destination of indirect jump for PIC
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## case.
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RUN: %clang %cflags -no-pie %S/Inputs/jump-table-fixed-ref-pic.s -Wl,-q -o %t
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RUN: llvm-bolt %t --relocs -o %t.null -print-cfg 2>&1 | FileCheck %s
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CHECK: BOLT-INFO: fixed PIC indirect branch detected in main {{.*}} the destination value is 0x[[#TGT:]]
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CHECK: Binary Function "main" after building cfg
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CHECK: movslq ".rodata/1"+8(%rip), %rax
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CHECK-NEXT: leaq ".rodata/1"(%rip), %rdx
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CHECK-NEXT: addq %rdx, %rax
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CHECK-NEXT: jmpq *%rax # UNKNOWN CONTROL FLOW
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