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2002-12-19  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/i386/sysdep.h: Add support to use AT_SYSINFO
	information for system calls.

	* sysdeps/generic/dl-sysdep.h: Define RTLD_PRIVATE_ERRNO to 1 only
	for ld.so.

	* elf/rtld.c (_dl_start) [USE___THREAD]: Define initdtv.
This commit is contained in:
Ulrich Drepper
2002-12-19 23:05:13 +00:00
parent 13880b3014
commit 5f5843e30d
7 changed files with 95 additions and 16 deletions
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75
sysdeps/unix/sysv/linux/i386/sysdep.h
View File

@ -24,14 +24,11 @@
#include <sysdeps/unix/i386/sysdep.h>
#include <bp-sym.h>
#include <bp-asm.h>
/* Defines RTLD_PRIVATE_ERRNO and NEED_DL_SYSINFO. */
#include <dl-sysdep.h>
#include <tls.h>
#ifdef IS_IN_rtld
# include <dl-sysdep.h> /* Defines RTLD_PRIVATE_ERRNO. */
#endif
/* For Linux we can use the system call table in the header file
/usr/include/asm/unistd.h
of the kernel. But these symbols do not follow the SYS_* syntax
@ -39,6 +36,12 @@
#undef SYS_ify
#define SYS_ify(syscall_name) __NR_##syscall_name
#if defined NEED_DL_SYSINFO && !defined IS_IN_rtld
# define I386_USE_SYSENTER 1
#else
# undef I386_USE_SYSENTER
#endif
#ifdef __ASSEMBLER__
/* Linux uses a negative return value to indicate syscall errors,
@ -162,7 +165,15 @@ __i686.get_pc_thunk.reg: \
/* The original calling convention for system calls on Linux/i386 is
to use int $0x80. */
#define ENTER_KERNEL int $0x80
#ifdef I386_USE_SYSENTER
# ifdef SHARED
# define ENTER_KERNEL call *%gs:SYSINFO_OFFSET
# else
# define ENTER_KERNEL call *_dl_sysinfo
# endif
#else
# define ENTER_KERNEL int $0x80
#endif
/* Linux takes system call arguments in registers:
@ -260,10 +271,6 @@ __i686.get_pc_thunk.reg: \
#else /* !__ASSEMBLER__ */
/* The original calling convention for system calls on Linux/i386 is
to use int $0x80. */
#define ENTER_KERNEL "int $0x80"
/* We need some help from the assembler to generate optimal code. We
define some macros here which later will be used. */
asm (".L__X'%ebx = 1\n\t"
@ -318,17 +325,46 @@ asm (".L__X'%ebx = 1\n\t"
normally. It will never touch errno. This returns just what the kernel
gave back. */
#undef INTERNAL_SYSCALL
#define INTERNAL_SYSCALL(name, nr, args...) \
#ifdef I386_USE_SYSENTER
# ifdef SHARED
# define INTERNAL_SYSCALL(name, nr, args...) \
({ \
unsigned int resultvar; \
asm volatile ( \
LOADARGS_##nr \
"movl %1, %%eax\n\t" \
ENTER_KERNEL "\n\t" \
"call *%%gs:%P2\n\t" \
RESTOREARGS_##nr \
: "=a" (resultvar) \
: "i" (__NR_##name), "i" (offsetof (tcbhead_t, sysinfo)) \
ASMFMT_##nr(args) : "memory", "cc"); \
(int) resultvar; })
# else
# define INTERNAL_SYSCALL(name, nr, args...) \
({ \
unsigned int resultvar; \
asm volatile ( \
LOADARGS_##nr \
"movl %1, %%eax\n\t" \
"call *_dl_sysinfo\n\t" \
RESTOREARGS_##nr \
: "=a" (resultvar) \
: "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc"); \
(int) resultvar; })
# endif
#else
# define INTERNAL_SYSCALL(name, nr, args...) \
({ \
unsigned int resultvar; \
asm volatile ( \
LOADARGS_##nr \
"movl %1, %%eax\n\t" \
"int $0x80\n\t" \
RESTOREARGS_##nr \
: "=a" (resultvar) \
: "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc"); \
(int) resultvar; })
#endif
#undef INTERNAL_SYSCALL_ERROR_P
#define INTERNAL_SYSCALL_ERROR_P(val) ((unsigned int) (val) >= 0xfffff001u)
@ -337,17 +373,28 @@ asm (".L__X'%ebx = 1\n\t"
#define INTERNAL_SYSCALL_ERRNO(val) (-(val))
#define LOADARGS_0
#define LOADARGS_1 \
#if defined I386_USE_SYSENTER && defined SHARED
# define LOADARGS_1 \
"bpushl .L__X'%k3, %k3\n\t" \
"bmovl .L__X'%k3, %k3\n\t"
#else
# define LOADARGS_1 \
"bpushl .L__X'%k2, %k2\n\t" \
"bmovl .L__X'%k2, %k2\n\t"
#endif
#define LOADARGS_2 LOADARGS_1
#define LOADARGS_3 LOADARGS_1
#define LOADARGS_4 LOADARGS_1
#define LOADARGS_5 LOADARGS_1
#define RESTOREARGS_0
#define RESTOREARGS_1 \
#if defined I386_USE_SYSENTER && defined SHARED
# define RESTOREARGS_1 \
"bpopl .L__X'%k3, %k3\n\t"
#else
# define RESTOREARGS_1 \
"bpopl .L__X'%k2, %k2\n\t"
#endif
#define RESTOREARGS_2 RESTOREARGS_1
#define RESTOREARGS_3 RESTOREARGS_1
#define RESTOREARGS_4 RESTOREARGS_1