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i386: Update I386_USE_SYSENTER for early PIC syscall 

Define I386_USE_SYSENTER to 0 or 1 so that special versions of syscalls
with "int $0x80" can be provided for static PIE during self relocation.
Also check PIC instead SHARED for PIC version of syscall macros.

	* sysdeps/unix/sysv/linux/i386/sysdep.h (I386_USE_SYSENTER):
	Define to I386_USE_SYSENTER to 0 or 1 if not defined.
	(ENTER_KERNEL): Check if I386_USE_SYSENTER is 1 and check PIC.
	(INTERNAL_SYSCALL_MAIN_INLINE): Likewise.
	(INTERNAL_SYSCALL_NCS): Likewise.
	(LOADARGS_1): Likewise.
	(LOADARGS_5): Likewise.
	(RESTOREARGS_1): Likewise.
	(RESTOREARGS_5): Likewise.
This commit is contained in:
H.J. Lu 2017-08-04 12:30:22 -07:00
parent fc11ff8d0a
commit 627c69c838
2 changed files with 26 additions and 12 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2017-08-04 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/unix/sysv/linux/i386/sysdep.h (I386_USE_SYSENTER):
Define to I386_USE_SYSENTER to 0 or 1 if not defined.
(ENTER_KERNEL): Check if I386_USE_SYSENTER is 1 and check PIC.
(INTERNAL_SYSCALL_MAIN_INLINE): Likewise.
(INTERNAL_SYSCALL_NCS): Likewise.
(LOADARGS_1): Likewise.
(LOADARGS_5): Likewise.
(RESTOREARGS_1): Likewise.
(RESTOREARGS_5): Likewise.
2017-08-04 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/x86_64/memmove.S (MEMCPY_SYMBOL): Don't check SHARED.

26
sysdeps/unix/sysv/linux/i386/sysdep.h
View File

@ -34,11 +34,13 @@
#undef SYS_ify
#define SYS_ify(syscall_name) __NR_##syscall_name
#if defined USE_DL_SYSINFO \
&& (IS_IN (libc) || IS_IN (libpthread))
# define I386_USE_SYSENTER 1
#else
# undef I386_USE_SYSENTER
#ifndef I386_USE_SYSENTER
# if defined USE_DL_SYSINFO \
&& (IS_IN (libc) || IS_IN (libpthread))
# define I386_USE_SYSENTER 1
# else
# define I386_USE_SYSENTER 0
# endif
#endif
/* Since GCC 5 and above can properly spill %ebx with PIC when needed,
@ -110,8 +112,8 @@
/* The original calling convention for system calls on Linux/i386 is
to use int $0x80. */
#ifdef I386_USE_SYSENTER
# ifdef SHARED
#if I386_USE_SYSENTER
# ifdef PIC
# define ENTER_KERNEL call *%gs:SYSINFO_OFFSET
# else
# define ENTER_KERNEL call *_dl_sysinfo
@ -357,9 +359,9 @@ struct libc_do_syscall_args
register unsigned int resultvar; \
INTERNAL_SYSCALL_MAIN_##nr (name, err, args); \
(int) resultvar; })
#ifdef I386_USE_SYSENTER
#if I386_USE_SYSENTER
# ifdef OPTIMIZE_FOR_GCC_5
# ifdef SHARED
# ifdef PIC
# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \
LOADREGS_##nr(args) \
asm volatile ( \
@ -395,7 +397,7 @@ struct libc_do_syscall_args
(int) resultvar; })
# endif
# else /* GCC 5 */
# ifdef SHARED
# ifdef PIC
# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \
EXTRAVAR_##nr \
asm volatile ( \
@ -494,7 +496,7 @@ struct libc_do_syscall_args
#define LOADARGS_0
#ifdef __PIC__
# if defined I386_USE_SYSENTER && defined SHARED
# if I386_USE_SYSENTER && defined PIC
# define LOADARGS_1 \
"bpushl .L__X'%k3, %k3\n\t"
# define LOADARGS_5 \
@ -521,7 +523,7 @@ struct libc_do_syscall_args
#define RESTOREARGS_0
#ifdef __PIC__
# if defined I386_USE_SYSENTER && defined SHARED
# if I386_USE_SYSENTER && defined PIC
# define RESTOREARGS_1 \
"bpopl .L__X'%k3, %k3\n\t"
# define RESTOREARGS_5 \