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llvm-6502/test/CodeGen/X86/jump_tables.ll
Tom Roeder 63dea2c952 Add Forward Control-Flow Integrity. 
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
2014-11-11 21:08:02 +00:00

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9.7 KiB
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; RUN: llc <%s -jump-table-type=single | FileCheck --check-prefix=SINGLE %s
; RUN: llc <%s -jump-table-type=arity | FileCheck --check-prefix=ARITY %s
; RUN: llc <%s -jump-table-type=simplified | FileCheck --check-prefix=SIMPL %s
; RUN: llc <%s -jump-table-type=full | FileCheck --check-prefix=FULL %s
target triple = "x86_64-unknown-linux-gnu"
%struct.fun_struct = type { i32 (...)* }
@a = global [12 x i32 () *] [ i32 ()* bitcast (void ()* @indirect_fun to i32 ()*),
i32 ()* bitcast (void ()* @indirect_fun_match to i32 ()*),
i32 ()* bitcast (i32 ()* @indirect_fun_i32 to i32 ()*),
i32 ()* bitcast (i32 (i32)* @indirect_fun_i32_1 to i32 ()*),
i32 ()* bitcast (i32 (i32, i32)* @indirect_fun_i32_2 to i32 ()*),
i32 ()* bitcast (i32* (i32*, i32)* @indirect_fun_i32S_2 to i32 ()*),
i32 ()* bitcast (void (%struct.fun_struct)* @indirect_fun_struct to i32 ()*),
i32 ()* bitcast (void (i32 (...)*, i32)* @indirect_fun_fun to i32 ()*),
i32 ()* bitcast (i32 (i32 (...)*, i32)* @indirect_fun_fun_ret to i32 ()*),
i32 ()* bitcast (void ([19 x i8])* @indirect_fun_array to i32 ()*),
i32 ()* bitcast (void (<3 x i32>)* @indirect_fun_vec to i32 ()*),
i32 ()* bitcast (void (<4 x float>)* @indirect_fun_vec_2 to i32 ()*)
]
define void @indirect_fun() unnamed_addr jumptable {
ret void
}
define void @indirect_fun_match() unnamed_addr jumptable {
ret void
}
define i32 @indirect_fun_i32() unnamed_addr jumptable {
ret i32 0
}
define i32 @indirect_fun_i32_1(i32 %a) unnamed_addr jumptable {
ret i32 %a
}
define i32 @indirect_fun_i32_2(i32 %a, i32 %b) unnamed_addr jumptable {
ret i32 %a
}
define i32* @indirect_fun_i32S_2(i32* %a, i32 %b) unnamed_addr jumptable {
ret i32* %a
}
define void @indirect_fun_struct(%struct.fun_struct %fs) unnamed_addr jumptable {
ret void
}
define void @indirect_fun_fun(i32 (...)* %fun, i32 %a) unnamed_addr jumptable {
ret void
}
define i32 @indirect_fun_fun_ret(i32 (...)* %fun, i32 %a) unnamed_addr jumptable {
ret i32 %a
}
define void @indirect_fun_array([19 x i8] %a) unnamed_addr jumptable {
ret void
}
define void @indirect_fun_vec(<3 x i32> %a) unnamed_addr jumptable {
ret void
}
define void @indirect_fun_vec_2(<4 x float> %a) unnamed_addr jumptable {
ret void
}
define i32 @m(void ()* %fun) {
call void ()* %fun()
ret i32 0
}
define void ()* @get_fun() {
ret void ()* @indirect_fun
; SINGLE: movl $__llvm_jump_instr_table_0_
; ARITY: movl $__llvm_jump_instr_table_
; SIMPL: movl $__llvm_jump_instr_table_
; FULL: movl $__llvm_jump_instr_table_
}
define i32 @main(i32 %argc, i8** %argv) {
%f = call void ()* ()* @get_fun()
%a = call i32 @m(void ()* %f)
ret i32 %a
}
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: .type __llvm_jump_instr_table_0_1,@function
; SINGLE-DAG: __llvm_jump_instr_table_0_1:
; SINGLE-DAG: jmp indirect_fun_array@PLT
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: .type __llvm_jump_instr_table_0_2,@function
; SINGLE-DAG: __llvm_jump_instr_table_0_2:
; SINGLE-DAG: jmp indirect_fun_i32_2@PLT
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: .type __llvm_jump_instr_table_0_3,@function
; SINGLE-DAG: __llvm_jump_instr_table_0_3:
; SINGLE-DAG: jmp indirect_fun_vec_2@PLT
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: .type __llvm_jump_instr_table_0_4,@function
; SINGLE-DAG: __llvm_jump_instr_table_0_4:
; SINGLE-DAG: jmp indirect_fun_i32S_2@PLT
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: .type __llvm_jump_instr_table_0_5,@function
; SINGLE-DAG: __llvm_jump_instr_table_0_5:
; SINGLE-DAG: jmp indirect_fun_struct@PLT
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: .type __llvm_jump_instr_table_0_6,@function
; SINGLE-DAG: __llvm_jump_instr_table_0_6:
; SINGLE-DAG: jmp indirect_fun_i32_1@PLT
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: .type __llvm_jump_instr_table_0_7,@function
; SINGLE-DAG: __llvm_jump_instr_table_0_7:
; SINGLE-DAG: jmp indirect_fun_i32@PLT
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: .type __llvm_jump_instr_table_0_8,@function
; SINGLE-DAG: __llvm_jump_instr_table_0_8:
; SINGLE-DAG: jmp indirect_fun_fun@PLT
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: .type __llvm_jump_instr_table_0_9,@function
; SINGLE-DAG: __llvm_jump_instr_table_0_9:
; SINGLE-DAG: jmp indirect_fun_fun_ret@PLT
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: .type __llvm_jump_instr_table_0_10,@function
; SINGLE-DAG: __llvm_jump_instr_table_0_10:
; SINGLE-DAG: jmp indirect_fun@PLT
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: .type __llvm_jump_instr_table_0_11,@function
; SINGLE-DAG: __llvm_jump_instr_table_0_11:
; SINGLE-DAG: jmp indirect_fun_match@PLT
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: .type __llvm_jump_instr_table_0_12,@function
; SINGLE-DAG: __llvm_jump_instr_table_0_12:
; SINGLE-DAG: jmp indirect_fun_vec@PLT
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: ud2
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: ud2
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: ud2
; SINGLE-DAG: .align 8, 0x90
; SINGLE-DAG: ud2
; ARITY-DAG: .align 8, 0x90
; ARITY-DAG: .type __llvm_jump_instr_table_2_1,@function
; ARITY-DAG: __llvm_jump_instr_table_2_1:
; ARITY-DAG: jmp indirect_fun{{.*}}@PLT
; ARITY-DAG: .align 8, 0x90
; ARITY-DAG: ud2
; ARITY-DAG: .align 8, 0x90
; ARITY-DAG: .type __llvm_jump_instr_table_0_1,@function
; ARITY-DAG: __llvm_jump_instr_table_0_1:
; ARITY-DAG: jmp indirect_fun{{.*}}@PLT
; ARITY-DAG: .align 8, 0x90
; ARITY-DAG: .type __llvm_jump_instr_table_1_1,@function
; ARITY-DAG: __llvm_jump_instr_table_1_1:
; ARITY-DAG: jmp indirect_fun{{.*}}@PLT
; SIMPL-DAG: .align 8, 0x90
; SIMPL-DAG: .type __llvm_jump_instr_table_2_1,@function
; SIMPL-DAG: __llvm_jump_instr_table_2_1:
; SIMPL-DAG: jmp indirect_fun{{.*}}@PLT
; SIMPL-DAG: .align 8, 0x90
; SIMPL-DAG: ud2
; SIMPL-DAG: .align 8, 0x90
; SIMPL-DAG: .type __llvm_jump_instr_table_0_1,@function
; SIMPL-DAG: __llvm_jump_instr_table_0_1:
; SIMPL-DAG: jmp indirect_fun{{.*}}@PLT
; SIMPL-DAG: .align 8, 0x90
; SIMPL-DAG: .type __llvm_jump_instr_table_1_1,@function
; SIMPL-DAG: __llvm_jump_instr_table_1_1:
; SIMPL-DAG: jmp indirect_fun{{.*}}@PLT
; SIMPL-DAG: .align 8, 0x90
; SIMPL-DAG: .type __llvm_jump_instr_table_3_1,@function
; SIMPL-DAG: __llvm_jump_instr_table_3_1:
; SIMPL-DAG: jmp indirect_fun{{.*}}@PLT
; SIMPL-DAG: .align 8, 0x90
; SIMPL-DAG: .type __llvm_jump_instr_table_4_1,@function
; SIMPL-DAG: __llvm_jump_instr_table_4_1:
; SIMPL-DAG: jmp indirect_fun{{.*}}@PLT
; FULL-DAG: .align 8, 0x90
; FULL-DAG: .type __llvm_jump_instr_table_10_1,@function
; FULL-DAG:__llvm_jump_instr_table_10_1:
; FULL-DAG: jmp indirect_fun_i32_1@PLT
; FULL-DAG: .align 8, 0x90
; FULL-DAG: ud2
; FULL-DAG: .align 8, 0x90
; FULL-DAG: .type __llvm_jump_instr_table_9_1,@function
; FULL-DAG:__llvm_jump_instr_table_9_1:
; FULL-DAG: jmp indirect_fun_i32_2@PLT
; FULL-DAG: .align 8, 0x90
; FULL-DAG: ud2
; FULL-DAG: .align 8, 0x90
; FULL-DAG: .type __llvm_jump_instr_table_7_1,@function
; FULL-DAG:__llvm_jump_instr_table_7_1:
; FULL-DAG: jmp indirect_fun_i32S_2@PLT
; FULL-DAG: .align 8, 0x90
; FULL-DAG: ud2
; FULL-DAG: .align 8, 0x90
; FULL-DAG: .type __llvm_jump_instr_table_3_1,@function
; FULL-DAG:__llvm_jump_instr_table_3_1:
; FULL-DAG: jmp indirect_fun_vec_2@PLT
; FULL-DAG: .align 8, 0x90
; FULL-DAG: ud2
; FULL-DAG: .align 8, 0x90
; FULL-DAG: .type __llvm_jump_instr_table_2_1,@function
; FULL-DAG:__llvm_jump_instr_table_2_1:
; FULL-DAG: jmp indirect_fun@PLT
; FULL-DAG: .align 8, 0x90
; FULL-DAG: ud2
; FULL-DAG: .align 8, 0x90
; FULL-DAG: ud2
; FULL-DAG: .align 8, 0x90
; FULL-DAG: .type __llvm_jump_instr_table_8_1,@function
; FULL-DAG:__llvm_jump_instr_table_8_1:
; FULL-DAG: jmp indirect_fun_i32@PLT
; FULL-DAG: .align 8, 0x90
; FULL-DAG: ud2
; FULL-DAG: .align 8, 0x90
; FULL-DAG: .type __llvm_jump_instr_table_1_1,@function
; FULL-DAG:__llvm_jump_instr_table_1_1:
; FULL-DAG: jmp indirect_fun_array@PLT
; FULL-DAG: .align 8, 0x90
; FULL-DAG: ud2
; FULL-DAG: .align 8, 0x90
; FULL-DAG: .type __llvm_jump_instr_table_0_1,@function
; FULL-DAG:__llvm_jump_instr_table_0_1:
; FULL-DAG: jmp indirect_fun_vec@PLT
; FULL-DAG: .align 8, 0x90
; FULL-DAG: ud2
; FULL-DAG: .align 8, 0x90
; FULL-DAG: .type __llvm_jump_instr_table_6_1,@function
; FULL-DAG:__llvm_jump_instr_table_6_1:
; FULL-DAG: jmp indirect_fun_struct@PLT
; FULL-DAG: .align 8, 0x90
; FULL-DAG: ud2
; FULL-DAG: .align 8, 0x90
; FULL-DAG: .type __llvm_jump_instr_table_5_1,@function
; FULL-DAG:__llvm_jump_instr_table_5_1:
; FULL-DAG: jmp indirect_fun_fun@PLT
; FULL-DAG: .align 8, 0x90
; FULL-DAG: ud2
; FULL-DAG: .align 8, 0x90
; FULL-DAG: .type __llvm_jump_instr_table_4_1,@function
; FULL-DAG:__llvm_jump_instr_table_4_1:
; FULL-DAG: jmp indirect_fun_fun_ret@PLT
; FULL-DAG: .align 8, 0x90
; FULL-DAG: ud2
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