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[sanitizer] Fix the internal_clone implementation on loongarch

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Fix syscall clone argument passing order, also `call fn(arg)` should
return, change `jr $a5`(jirl $zero, $a5, 0) to `jirl $ra, $a5, 0`.

Reviewed By: SixWeining

Differential Revision: https://reviews.llvm.org/D139619
This commit is contained in:
Youling Tang 2022-12-10 11:50:35 +08:00 committed by Weining Lu
parent 97f370a0a3
commit 1f8ea4149c
1 changed files with 5 additions and 4 deletions
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9
compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
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@ -1514,8 +1514,8 @@ uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
register int __flags __asm__("$a0") = flags;
register void *__stack __asm__("$a1") = child_stack;
register int *__ptid __asm__("$a2") = parent_tidptr;
register void *__tls __asm__("$a3") = newtls;
register int *__ctid __asm__("$a4") = child_tidptr;
register int *__ctid __asm__("$a3") = child_tidptr;
register void *__tls __asm__("$a4") = newtls;
register int (*__fn)(void *) __asm__("$a5") = fn;
register void *__arg __asm__("$a6") = arg;
register int nr_clone __asm__("$a7") = __NR_clone;
@ -1529,15 +1529,16 @@ uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
// In the child, now. Call "fn(arg)".
"move $a0, $a6\n"
"jr $a5\n"
"jirl $ra, $a5, 0\n"
// Call _exit($a0).
"addi.d $a7, $zero, %9\n"
"syscall 0\n"
"1:\n"
: "=r"(res)
: "0"(__flags), "r"(__stack), "r"(__ptid), "r"(__tls), "r"(__ctid),
: "0"(__flags), "r"(__stack), "r"(__ptid), "r"(__ctid), "r"(__tls),
"r"(__fn), "r"(__arg), "r"(nr_clone), "i"(__NR_exit)
: "memory", "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8");
return res;