08-dont-add-sp-to-clobber-list.patch

changeset:   543157:f54952905cb1
user:        Sylvestre Ledru <sledru@mozilla.com>
date:        Fri Jun 14 07:14:08 2019 +0000
summary:     Bug 1524194 - Do not add stack pointer to clobber list r=gsvelto

diff --git a/src/third_party/lss/linux_syscall_support.h b/src/third_party/lss/linux_syscall_support.h
--- a/src/third_party/lss/linux_syscall_support.h
+++ b/src/third_party/lss/linux_syscall_support.h
@@ -1959,17 +1959,17 @@ struct kernel_statfs {
       LSS_RETURN(type,__res)
     #undef  _syscall0
     #define _syscall0(type,name)                                              \
       type LSS_NAME(name)(void) {                                             \
         long __res;                                                           \
         __asm__ volatile(LSS_ENTRYPOINT                                       \
                          : "=a" (__res)                                       \
                          : "0" (__NR_##name)                                  \
-                         : "esp", "memory");                                  \
+                         : "memory");                                         \
         LSS_RETURN(type,__res);                                               \
       }
     #undef  _syscall1
     #define _syscall1(type,name,type1,arg1)                                   \
       type LSS_NAME(name)(type1 arg1) {                                       \
         LSS_BODY(type,                                                        \
              : "=a" (__res)                                                   \
              : "0" (__NR_##name), "ri" ((long)(arg1)));                       \
@@ -2400,17 +2400,17 @@ struct kernel_statfs {
                              : "0"(-EINVAL), "i"(__NR_clone), "i"(__NR_exit),
                                "r"(LSS_SYSCALL_ARG(fn)),
                                "S"(LSS_SYSCALL_ARG(child_stack)),
                                "D"(LSS_SYSCALL_ARG(flags)),
                                "r"(LSS_SYSCALL_ARG(arg)),
                                "d"(LSS_SYSCALL_ARG(parent_tidptr)),
                                "r"(LSS_SYSCALL_ARG(newtls)),
                                "r"(LSS_SYSCALL_ARG(child_tidptr))
-                             : "rsp", "memory", "r8", "r10", "r11", "rcx");
+                             : "memory", "r8", "r10", "r11", "rcx");
       }
       LSS_RETURN(int, __res);
     }
     LSS_INLINE _syscall2(int, arch_prctl, int, c, void *, a)
 
     LSS_INLINE void (*LSS_NAME(restore_rt)(void))(void) {
       /* On x86-64, the kernel does not know how to return from
        * a signal handler. Instead, it relies on user space to provide a