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[libc] Add __attribute__((always_inline)) to x86_64 syscall functions.

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Summary:
Some syscalls like SYS_clone do not tolerate a return instruction after
the syscall instruction. Marking the syscall functions with the
`always_inline` attribute accommodates such syscalls as inlining
eliminates the return instruction.

Reviewers: abrachet, phosek

Subscribers: MaskRay, tschuett, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D72102
This commit is contained in:
Siva Chandra Reddy 2020-01-02 11:09:18 -08:00
parent ff554a9179
commit 6598af4a54
1 changed files with 14 additions and 10 deletions
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24
libc/config/linux/x86_64/syscall.h.inc
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@ -1,4 +1,4 @@
//===------------ inline implementation of x86_64 syscalls --------------*-===//
//===------------ inline implementation of x86_64 syscalls ----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
@ -14,7 +14,7 @@
namespace __llvm_libc {
inline long syscall(long __number) {
__attribute__((always_inline)) inline long syscall(long __number) {
long retcode;
LIBC_INLINE_ASM("syscall" :
"=a"(retcode) :
@ -23,7 +23,7 @@ inline long syscall(long __number) {
return retcode;
}
inline long syscall(long __number, long __arg1) {
__attribute__((always_inline)) inline long syscall(long __number, long __arg1) {
long retcode;
LIBC_INLINE_ASM("syscall" :
"=a"(retcode) :
@ -32,7 +32,8 @@ inline long syscall(long __number, long __arg1) {
return retcode;
}
inline long syscall(long __number, long __arg1, long __arg2) {
__attribute__((always_inline)) inline long syscall(
long __number, long __arg1, long __arg2) {
long retcode;
LIBC_INLINE_ASM("syscall" :
"=a"(retcode) :
@ -41,7 +42,8 @@ inline long syscall(long __number, long __arg1, long __arg2) {
return retcode;
}
inline long syscall(long __number, long __arg1, long __arg2, long __arg3) {
__attribute__((always_inline)) inline long syscall(
long __number, long __arg1, long __arg2, long __arg3) {
long retcode;
LIBC_INLINE_ASM("syscall" :
"=a"(retcode) :
@ -50,7 +52,7 @@ inline long syscall(long __number, long __arg1, long __arg2, long __arg3) {
return retcode;
}
inline long syscall(
__attribute__((always_inline)) inline long syscall(
long __number, long __arg1, long __arg2, long __arg3, long __arg4) {
long retcode;
register long r10 __asm__("r10") = __arg4;
@ -61,8 +63,9 @@ inline long syscall(
return retcode;
}
inline long syscall(long __number, long __arg1, long __arg2, long __arg3,
long __arg4, long __arg5) {
__attribute__((always_inline)) inline long syscall(
long __number, long __arg1, long __arg2, long __arg3, long __arg4,
long __arg5) {
long retcode;
register long r10 __asm__("r10") = __arg4;
register long r8 __asm__("r8") = __arg5;
@ -74,8 +77,9 @@ inline long syscall(long __number, long __arg1, long __arg2, long __arg3,
return retcode;
}
inline long syscall(long __number, long __arg1, long __arg2, long __arg3,
long __arg4, long __arg5, long __arg6) {
__attribute__((always_inline)) inline long syscall(
long __number, long __arg1, long __arg2, long __arg3, long __arg4,
long __arg5, long __arg6) {
long retcode;
register long r10 __asm__("r10") = __arg4;
register long r8 __asm__("r8") = __arg5;