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Add REGISTERS_CLOBBERED_BY_SYSCALL for x86-64

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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.
This commit is contained in:
H.J. Lu 2015-12-16 05:19:57 -08:00
parent 3da825ce48
commit d29d57eed9
2 changed files with 12 additions and 2 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2015-12-16 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/unix/sysv/linux/x86_64/sysdep.h
(REGISTERS_CLOBBERED_BY_SYSCALL): New.
(INTERNAL_SYSCALL_NCS): Use it.
(INTERNAL_SYSCALL_NCS_TYPES): Likewise.
2015-12-16 Florian Weimer <fweimer@redhat.com>
[BZ #19243]

7
sysdeps/unix/sysv/linux/x86_64/sysdep.h
View File

@ -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...) \