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* sysdeps/unix/sysv/linux/i386/sysdep.h (SYSCALL_ERROR_HANDLER):

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New macro.
	(PSEUDO): Use it instead of SYSCALL_PIC_SETUP and jmp syscall_error.

	* sysdeps/unix/sysv/linux/i386/sysdep.S (__syscall_error): Define
	only #ifndef PIC.

	* Makeconfig (built-program-cmd): New variable.
	* sunrpc/Makefile (rpcgen-cmd): Use $(built-program-cmd).
	* time/Makefile (zic-cmd): Likewise.

	* hurd/Makefile (user-interfaces): Add hurd/exec_startup.
This commit is contained in:
Roland McGrath
1995-10-25 02:19:39 +00:00
parent e97ec51d01
commit 03a7582576
10 changed files with 99 additions and 32 deletions
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29
sysdeps/unix/sysv/linux/i386/sysdep.S
View File

@@ -16,17 +16,6 @@ License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/* The syscall stubs jump here when they detect an error.
The code for Linux is almost identical to the canonical Unix/i386
code, except that the error number in %eax is negated. */
.globl __syscall_error
__syscall_error:
negl %eax
#define __syscall_error __syscall_error_1
#include <sysdeps/unix/i386/sysdep.S>
/* Because the Linux version is in fact i386/ELF and the start.? file
for this system (sysdeps/i386/elf/start.S) is also used by The Hurd
and therefore this files must not contain the definition of the
@@ -38,3 +27,21 @@ __syscall_error:
.globl errno
errno:
.long 0
/* The following code is not used at all in the shared library.
The PIC system call stubs set errno themselves. */
#ifndef PIC
/* The syscall stubs jump here when they detect an error.
The code for Linux is almost identical to the canonical Unix/i386
code, except that the error number in %eax is negated. */
.globl __syscall_error
__syscall_error:
negl %eax
#define __syscall_error __syscall_error_1
#include <sysdeps/unix/i386/sysdep.S>
#endif

27
sysdeps/unix/sysv/linux/i386/sysdep.h
View File

@@ -42,16 +42,31 @@ Cambridge, MA 02139, USA. */
#undef PSEUDO
#define PSEUDO(name, syscall_name, args) \
.text; \
lose: SYSCALL_PIC_SETUP \
jmp JUMPTARGET (syscall_error) \
.globl syscall_error; \
SYSCALL_ERROR_HANDLER \
ENTRY (name) \
movl $SYS_ify (syscall_name), %eax; \
DO_CALL (args); \
testl %eax, %eax; \
jl lose
jl syscall_error;
/* We define our own ENTRY macro because the alignment should be 16 for ELF. */
#ifndef PIC
#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
#else
/* Store (- %eax) into errno through the GOT. */
#define SYSCALL_ERROR_HANDLER \
syscall_error: \
call 0f; \
0:popl %ecx; \
negl %eax; \
addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %ecx; \
movl errno@GOT(%ecx), %ecx; \
movl %eax, (%ecx); \
movl $-1, %eax; \
ret
#endif
/* We define our own ENTRY macro because the alignment should be 16 for
ELF. */
#undef ENTRY
#define ENTRY(name) \
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (name); \
@@ -81,7 +96,7 @@ Cambridge, MA 02139, USA. */
arguments 4 and 5.)
The following code tries hard to be optimal. A general assuption
(which is true accoriding to the data books I have) is that
(which is true according to the data books I have) is that
2 * xchg is more expensive than pushl + movl + popl