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| author | H.J. Lu <hjl.tools@gmail.com> | 2015-12-16 05:19:57 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2015-12-16 05:20:15 -0800 |
| commit | d29d57eed9a6acb646663a02b7eb2bece2c433dc (patch) | |
| tree | 09982bea60ce5a9dc10312e28e5e20e2d6362cb9 /sysdeps | |
| parent | 3da825ce483903e3a881a016113b3e59fd4041de (diff) | |
| download | glibc-d29d57eed9a6acb646663a02b7eb2bece2c433dc.tar.gz | |
Add REGISTERS_CLOBBERED_BY_SYSCALL for x86-64
X86-64 system calls use a different calling convention, which clobbers
CC, %r11 an %rcx registers. Define REGISTERS_CLOBBERED_BY_SYSCALL for
x86-64 inline asm statements.
* sysdeps/unix/sysv/linux/x86_64/sysdep.h
(REGISTERS_CLOBBERED_BY_SYSCALL): New.
(INTERNAL_SYSCALL_NCS): Use it.
(INTERNAL_SYSCALL_NCS_TYPES): Likewise.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/sysdep.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/sysdep.h b/sysdeps/unix/sysv/linux/x86_64/sysdep.h index fc132f6791..c364d0816a 100644 --- a/sysdeps/unix/sysv/linux/x86_64/sysdep.h +++ b/sysdeps/unix/sysv/linux/x86_64/sysdep.h @@ -218,6 +218,9 @@ # undef INTERNAL_SYSCALL_DECL # define INTERNAL_SYSCALL_DECL(err) do { } while (0) +/* Registers clobbered by syscall. */ +# define REGISTERS_CLOBBERED_BY_SYSCALL "cc", "r11", "cx" + # define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ ({ \ unsigned long int resultvar; \ @@ -226,7 +229,7 @@ asm volatile ( \ "syscall\n\t" \ : "=a" (resultvar) \ - : "0" (name) ASM_ARGS_##nr : "memory", "cc", "r11", "cx"); \ + : "0" (name) ASM_ARGS_##nr : "memory", REGISTERS_CLOBBERED_BY_SYSCALL); \ (long int) resultvar; }) # undef INTERNAL_SYSCALL # define INTERNAL_SYSCALL(name, err, nr, args...) \ @@ -240,7 +243,7 @@ asm volatile ( \ "syscall\n\t" \ : "=a" (resultvar) \ - : "0" (name) ASM_ARGS_##nr : "memory", "cc", "r11", "cx"); \ + : "0" (name) ASM_ARGS_##nr : "memory", REGISTERS_CLOBBERED_BY_SYSCALL); \ (long int) resultvar; }) # undef INTERNAL_SYSCALL_TYPES # define INTERNAL_SYSCALL_TYPES(name, err, nr, args...) \ |