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2aa98cf3bd
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
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|---|---|---|
| .. | ||
| InstPrinter | ||
| MCTargetDesc | ||
| TargetInfo | ||
| BPF.h | ||
| BPF.td | ||
| BPFAsmPrinter.cpp | ||
| BPFCallingConv.td | ||
| BPFFrameLowering.cpp | ||
| BPFFrameLowering.h | ||
| BPFInstrFormats.td | ||
| BPFInstrInfo.cpp | ||
| BPFInstrInfo.h | ||
| BPFInstrInfo.td | ||
| BPFISelDAGToDAG.cpp | ||
| BPFISelLowering.cpp | ||
| BPFISelLowering.h | ||
| BPFMCInstLower.cpp | ||
| BPFMCInstLower.h | ||
| BPFRegisterInfo.cpp | ||
| BPFRegisterInfo.h | ||
| BPFRegisterInfo.td | ||
| BPFSubtarget.cpp | ||
| BPFSubtarget.h | ||
| BPFTargetMachine.cpp | ||
| BPFTargetMachine.h | ||
| CMakeLists.txt | ||
| LLVMBuild.txt | ||
| Makefile | ||