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fix incorrect arch register use for kprobe func with more parameters #3275

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Feb 19, 2021
Merged

fix incorrect arch register use for kprobe func with more parameters #3275

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11 changes: 7 additions & 4 deletions src/cc/frontends/clang/b_frontend_action.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -766,17 +766,20 @@ void BTypeVisitor::genParamIndirectAssign(FunctionDecl *D, string& preamble,
}

void BTypeVisitor::rewriteFuncParam(FunctionDecl *D) {
const char **calling_conv_regs = get_call_conv(true);

string preamble = "{\n";
if (D->param_size() > 1) {
bool is_syscall = false;
if (strncmp(D->getName().str().c_str(), "syscall__", 9) == 0 ||
strncmp(D->getName().str().c_str(), "kprobe____x64_sys_", 18) == 0)
is_syscall = true;
const char **calling_conv_regs = get_call_conv(is_syscall);

// If function prefix is "syscall__" or "kprobe____x64_sys_",
// the function will attach to a kprobe syscall function.
// Guard parameter assiggnment with CONFIG_ARCH_HAS_SYSCALL_WRAPPER.
// For __x64_sys_* syscalls, this is always true, but we guard
// it in case of "syscall__" for other architectures.
if (strncmp(D->getName().str().c_str(), "syscall__", 9) == 0 ||
strncmp(D->getName().str().c_str(), "kprobe____x64_sys_", 18) == 0) {
if (is_syscall) {
preamble += "#if defined(CONFIG_ARCH_HAS_SYSCALL_WRAPPER) && !defined(__s390x__)\n";
genParamIndirectAssign(D, preamble, calling_conv_regs);
preamble += "\n#else\n";
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