d06303ffc1
The t2CALL_BTI pseudo-instruction expands to a tBL instruction, so needs the same implicit uses and defs as it.
116 lines
3.0 KiB
LLVM
116 lines
3.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc -mtriple=thumbv8.1m.main-arm-none-eabi < %s | FileCheck %s --check-prefix=BTI
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; RUN: llc -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+no-bti-at-return-twice < %s | \
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; RUN: FileCheck %s --check-prefix=NOBTI
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; C source
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; --------
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; jmp_buf buf;
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;
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; extern void bar(int x);
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;
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; int foo(int x) {
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; if (setjmp(buf))
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; x = 0;
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; else
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; bar(x);
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; return x;
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; }
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@buf = global [20 x i64] zeroinitializer, align 8
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define i32 @foo(i32 %x) "branch-target-enforcement" {
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; BTI-LABEL: foo:
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; BTI: @ %bb.0: @ %entry
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; BTI-NEXT: bti
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; BTI-NEXT: .save {r4, lr}
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; BTI-NEXT: push {r4, lr}
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; BTI-NEXT: mov r4, r0
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; BTI-NEXT: movw r0, :lower16:buf
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; BTI-NEXT: movt r0, :upper16:buf
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; BTI-NEXT: bl setjmp
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; BTI-NEXT: bti
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; BTI-NEXT: cmp r0, #0
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; BTI-NEXT: itt ne
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; BTI-NEXT: movne r0, #0
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; BTI-NEXT: popne {r4, pc}
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; BTI-NEXT: .LBB0_1: @ %if.else
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; BTI-NEXT: mov r0, r4
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; BTI-NEXT: bl bar
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; BTI-NEXT: mov r0, r4
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; BTI-NEXT: pop {r4, pc}
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;
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; NOBTI-LABEL: foo:
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; NOBTI: @ %bb.0: @ %entry
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; NOBTI-NEXT: bti
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; NOBTI-NEXT: .save {r4, lr}
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; NOBTI-NEXT: push {r4, lr}
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; NOBTI-NEXT: mov r4, r0
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; NOBTI-NEXT: movw r0, :lower16:buf
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; NOBTI-NEXT: movt r0, :upper16:buf
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; NOBTI-NEXT: bl setjmp
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; NOBTI-NEXT: cmp r0, #0
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; NOBTI-NEXT: itt ne
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; NOBTI-NEXT: movne r0, #0
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; NOBTI-NEXT: popne {r4, pc}
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; NOBTI-NEXT: .LBB0_1: @ %if.else
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; NOBTI-NEXT: mov r0, r4
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; NOBTI-NEXT: bl bar
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; NOBTI-NEXT: mov r0, r4
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; NOBTI-NEXT: pop {r4, pc}
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entry:
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%call = call i32 @setjmp(ptr @buf) #0
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%tobool.not = icmp eq i32 %call, 0
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br i1 %tobool.not, label %if.else, label %if.end
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if.else: ; preds = %entry
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call void @bar(i32 %x)
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br label %if.end
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if.end: ; preds = %entry, %if.else
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%x.addr.0 = phi i32 [ %x, %if.else ], [ 0, %entry ]
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ret i32 %x.addr.0
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}
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;; Check that the BL to setjmp correctly clobbers LR
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define i32 @baz() "branch-target-enforcement" {
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; BTI-LABEL: baz:
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; BTI: @ %bb.0: @ %entry
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; BTI-NEXT: bti
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; BTI-NEXT: .save {r7, lr}
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; BTI-NEXT: push {r7, lr}
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; BTI-NEXT: .pad #160
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; BTI-NEXT: sub sp, #160
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; BTI-NEXT: mov r0, sp
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; BTI-NEXT: bl setjmp
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; BTI-NEXT: bti
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; BTI-NEXT: movs r0, #0
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; BTI-NEXT: add sp, #160
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; BTI-NEXT: pop {r7, pc}
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;
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; NOBTI-LABEL: baz:
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; NOBTI: @ %bb.0: @ %entry
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; NOBTI-NEXT: bti
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; NOBTI-NEXT: .save {r7, lr}
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; NOBTI-NEXT: push {r7, lr}
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; NOBTI-NEXT: .pad #160
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; NOBTI-NEXT: sub sp, #160
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; NOBTI-NEXT: mov r0, sp
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; NOBTI-NEXT: bl setjmp
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; NOBTI-NEXT: movs r0, #0
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; NOBTI-NEXT: add sp, #160
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; NOBTI-NEXT: pop {r7, pc}
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entry:
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%outgoing_jb = alloca [20 x i64], align 8
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%call = call i32 @setjmp(ptr %outgoing_jb) returns_twice
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ret i32 0
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}
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declare void @bar(i32)
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declare i32 @setjmp(ptr) #0
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attributes #0 = { returns_twice }
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