mirror of
https://github.com/c64scene-ar/llvm-6502.git
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63dea2c952
This commit adds a new pass that can inject checks before indirect calls to make sure that these calls target known locations. It supports three types of checks and, at compile time, it can take the name of a custom function to call when an indirect call check fails. The default failure function ignores the error and continues. This pass incidentally moves the function JumpInstrTables::transformType from private to public and makes it static (with a new argument that specifies the table type to use); this is so that the CFI code can transform function types at call sites to determine which jump-instruction table to use for the check at that site. Also, this removes support for jumptables in ARM, pending further performance analysis and discussion. Review: http://reviews.llvm.org/D4167 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221708 91177308-0d34-0410-b5e6-96231b3b80d8
44 lines
1.1 KiB
LLVM
44 lines
1.1 KiB
LLVM
; RUN: llc -fcfi -cfi-type=sub <%s | FileCheck --check-prefix=SUB %s
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; RUN: llc -fcfi -cfi-type=add <%s | FileCheck --check-prefix=ADD %s
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; RUN: llc -fcfi -cfi-type=ror <%s | FileCheck --check-prefix=ROR %s
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target triple = "x86_64-unknown-linux-gnu"
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define void @indirect_fun() unnamed_addr jumptable {
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ret void
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}
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define i32 @m(void ()* %fun) {
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call void ()* %fun()
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; SUB: subl
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; SUB: andq $8
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; SUB-LABEL: leaq __llvm_jump_instr_table_0_1
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; SUB-LABEL: callq __llvm_cfi_pointer_warning
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; ROR: subq
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; ROR: rolq $61
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; ROR: testq
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; ROR-LABEL: callq __llvm_cfi_pointer_warning
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; ADD: andq $8
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; ADD-LABEL: leaq __llvm_jump_instr_table_0_1
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; ADD: cmpq
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; ADD-LABEL: callq __llvm_cfi_pointer_warning
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ret i32 0
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}
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define void ()* @get_fun() {
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ret void ()* @indirect_fun
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}
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define i32 @main(i32 %argc, i8** %argv) {
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%f = call void ()* ()* @get_fun()
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%a = call i32 @m(void ()* %f)
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ret i32 %a
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}
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; SUB: .text
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; SUB: .align 8
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; SUB-LABEL: .type __llvm_jump_instr_table_0_1,@function
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; SUB-LABEL:__llvm_jump_instr_table_0_1:
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; SUB-LABEL: jmp indirect_fun@PLT
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