4e01a38da0
For the program like below
struct key_t {
int pid;
char name[16];
};
extern void test1(char *);
int test() {
struct key_t key = {};
test1(key.name);
return 0;
}
For key.name, the llc/bpf may generate the below code:
R1 = R10 // R10 is the frame pointer
R1 += -24 // framepointer adjustment
R1 |= 4 // R1 is then used as the first parameter of test1
OR operation is not recognized by in-kernel verifier.
This patch introduces an intermediate FI_ri instruction and
generates the following code that can be properly verified:
R1 = R10
R1 += -20
Patch by Yonghong Song <yhs@plumgrid.com>
llvm-svn: 249371
26 lines
725 B
LLVM
26 lines
725 B
LLVM
; RUN: llc < %s -march=bpf | FileCheck %s
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%struct.key_t = type { i32, [16 x i8] }
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; Function Attrs: nounwind uwtable
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define i32 @test() #0 {
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%key = alloca %struct.key_t, align 4
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%1 = bitcast %struct.key_t* %key to i8*
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; CHECK: mov r1, 0
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; CHECK: stw -8(r10), r1
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; CHECK: std -16(r10), r1
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; CHECK: std -24(r10), r1
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call void @llvm.memset.p0i8.i64(i8* %1, i8 0, i64 20, i32 4, i1 false)
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; CHECK: mov r1, r10
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; CHECK: addi r1, -20
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%2 = getelementptr inbounds %struct.key_t, %struct.key_t* %key, i64 0, i32 1, i64 0
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; CHECK: call test1
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call void @test1(i8* %2) #3
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ret i32 0
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}
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; Function Attrs: nounwind argmemonly
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) #1
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declare void @test1(i8*) #2
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