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Update.
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.
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Ulrich Drepper
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13880b3014
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10
ChangeLog
10
ChangeLog
@ -1,3 +1,13 @@
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2002-12-19 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/unix/sysv/linux/i386/sysdep.h: Add support to use AT_SYSINFO
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information for system calls.
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* sysdeps/generic/dl-sysdep.h: Define RTLD_PRIVATE_ERRNO to 1 only
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for ld.so.
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* elf/rtld.c (_dl_start) [USE___THREAD]: Define initdtv.
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2002-12-19 Roland McGrath <roland@redhat.com>
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* iconvdata/ibm856.h: Convert GCC extension initializer syntax to C99.
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@ -37,6 +37,7 @@
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#include <unsecvars.h>
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#include <dl-cache.h>
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#include <dl-procinfo.h>
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#include <tls.h>
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#include <assert.h>
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@ -328,6 +329,7 @@ _dl_start (void *arg)
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to it. When we have something like GOTOFF relocs, we can use a plain
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reference to find the runtime address. Without that, we have to rely
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on the `l_addr' value, which is not the value we want when prelinked. */
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dtv_t initdtv[3];
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ElfW(Ehdr) *ehdr
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# ifdef DONT_USE_BOOTSTRAP_MAP
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= (ElfW(Ehdr) *) &_begin;
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@ -1,5 +1,12 @@
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2002-12-19 Ulrich Drepper <drepper@redhat.com>
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* allocatestack.c (allocate_stack) [NEED_DL_SYSINFO]: Set sysinfo
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in new TCB.
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* sysdeps/unix/sysv/linux/i386/createthread.c (create_thread): Check
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that sysinfo is properly initialized.
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* sysdeps/unix/sysv/linux/i386/dl-sysdep.h: Define RTLD_PRIVATE_ERRNO
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to 1 only for ld.so.
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* sysdeps/unix/sysv/linux/i386/dl-sysdep.h: Define
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RTLD_CORRECT_DYNAMIC_WEAK.
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@ -108,6 +108,11 @@ create_thread (struct pthread *pd, STACK_VARIABLES_PARMS)
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}
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}
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#ifdef NEED_DL_SYSINFO
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assert (THREAD_GETMEM (THREAD_SELF, header.data.sysinfo)
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== pd->header.data.sysinfo);
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#endif
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/* We rely heavily on various flags the CLONE function understands:
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CLONE_VM, CLONE_FS, CLONE_FILES
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@ -28,7 +28,11 @@
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all the libc functions that ld.so uses are called without PLT and always
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get the versions linked into ld.so rather than the libc ones. */
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#define RTLD_PRIVATE_ERRNO 1
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#ifdef IS_IN_rtld
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# define RTLD_PRIVATE_ERRNO 1
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#else
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# define RTLD_PRIVATE_ERRNO 0
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#endif
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/* This configuration has in libc.so cancellable functions and other
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functions which have to behave differently if the application uses
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@ -25,4 +25,8 @@
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all the libc functions that ld.so uses are called without PLT and always
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get the versions linked into ld.so rather than the libc ones. */
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#define RTLD_PRIVATE_ERRNO 1
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#ifdef IS_IN_rtld
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# define RTLD_PRIVATE_ERRNO 1
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#else
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# define RTLD_PRIVATE_ERRNO 0
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#endif
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@ -24,14 +24,11 @@
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#include <sysdeps/unix/i386/sysdep.h>
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#include <bp-sym.h>
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#include <bp-asm.h>
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/* Defines RTLD_PRIVATE_ERRNO and NEED_DL_SYSINFO. */
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#include <dl-sysdep.h>
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#include <tls.h>
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#ifdef IS_IN_rtld
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# include <dl-sysdep.h> /* Defines RTLD_PRIVATE_ERRNO. */
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#endif
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/* For Linux we can use the system call table in the header file
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/usr/include/asm/unistd.h
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of the kernel. But these symbols do not follow the SYS_* syntax
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@ -39,6 +36,12 @@
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#undef SYS_ify
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#define SYS_ify(syscall_name) __NR_##syscall_name
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#if defined NEED_DL_SYSINFO && !defined IS_IN_rtld
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# define I386_USE_SYSENTER 1
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#else
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# undef I386_USE_SYSENTER
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#endif
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#ifdef __ASSEMBLER__
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/* Linux uses a negative return value to indicate syscall errors,
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@ -162,7 +165,15 @@ __i686.get_pc_thunk.reg: \
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/* The original calling convention for system calls on Linux/i386 is
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to use int $0x80. */
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#define ENTER_KERNEL int $0x80
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#ifdef I386_USE_SYSENTER
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# ifdef SHARED
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# define ENTER_KERNEL call *%gs:SYSINFO_OFFSET
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# else
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# define ENTER_KERNEL call *_dl_sysinfo
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# endif
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#else
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# define ENTER_KERNEL int $0x80
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#endif
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/* Linux takes system call arguments in registers:
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@ -260,10 +271,6 @@ __i686.get_pc_thunk.reg: \
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#else /* !__ASSEMBLER__ */
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/* The original calling convention for system calls on Linux/i386 is
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to use int $0x80. */
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#define ENTER_KERNEL "int $0x80"
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/* We need some help from the assembler to generate optimal code. We
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define some macros here which later will be used. */
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asm (".L__X'%ebx = 1\n\t"
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@ -318,17 +325,46 @@ asm (".L__X'%ebx = 1\n\t"
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normally. It will never touch errno. This returns just what the kernel
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gave back. */
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#undef INTERNAL_SYSCALL
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#define INTERNAL_SYSCALL(name, nr, args...) \
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#ifdef I386_USE_SYSENTER
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# ifdef SHARED
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# define INTERNAL_SYSCALL(name, nr, args...) \
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({ \
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unsigned int resultvar; \
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asm volatile ( \
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LOADARGS_##nr \
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"movl %1, %%eax\n\t" \
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ENTER_KERNEL "\n\t" \
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"call *%%gs:%P2\n\t" \
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RESTOREARGS_##nr \
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: "=a" (resultvar) \
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: "i" (__NR_##name), "i" (offsetof (tcbhead_t, sysinfo)) \
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ASMFMT_##nr(args) : "memory", "cc"); \
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(int) resultvar; })
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# else
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# define INTERNAL_SYSCALL(name, nr, args...) \
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({ \
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unsigned int resultvar; \
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asm volatile ( \
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LOADARGS_##nr \
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"movl %1, %%eax\n\t" \
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"call *_dl_sysinfo\n\t" \
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RESTOREARGS_##nr \
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: "=a" (resultvar) \
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: "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc"); \
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(int) resultvar; })
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# endif
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#else
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# define INTERNAL_SYSCALL(name, nr, args...) \
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({ \
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unsigned int resultvar; \
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asm volatile ( \
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LOADARGS_##nr \
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"movl %1, %%eax\n\t" \
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"int $0x80\n\t" \
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RESTOREARGS_##nr \
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: "=a" (resultvar) \
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: "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc"); \
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(int) resultvar; })
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#endif
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#undef INTERNAL_SYSCALL_ERROR_P
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#define INTERNAL_SYSCALL_ERROR_P(val) ((unsigned int) (val) >= 0xfffff001u)
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@ -337,17 +373,28 @@ asm (".L__X'%ebx = 1\n\t"
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#define INTERNAL_SYSCALL_ERRNO(val) (-(val))
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#define LOADARGS_0
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#define LOADARGS_1 \
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#if defined I386_USE_SYSENTER && defined SHARED
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# define LOADARGS_1 \
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"bpushl .L__X'%k3, %k3\n\t" \
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"bmovl .L__X'%k3, %k3\n\t"
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#else
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# define LOADARGS_1 \
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"bpushl .L__X'%k2, %k2\n\t" \
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"bmovl .L__X'%k2, %k2\n\t"
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#endif
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#define LOADARGS_2 LOADARGS_1
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#define LOADARGS_3 LOADARGS_1
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#define LOADARGS_4 LOADARGS_1
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#define LOADARGS_5 LOADARGS_1
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#define RESTOREARGS_0
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#define RESTOREARGS_1 \
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#if defined I386_USE_SYSENTER && defined SHARED
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# define RESTOREARGS_1 \
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"bpopl .L__X'%k3, %k3\n\t"
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#else
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# define RESTOREARGS_1 \
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"bpopl .L__X'%k2, %k2\n\t"
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#endif
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#define RESTOREARGS_2 RESTOREARGS_1
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#define RESTOREARGS_3 RESTOREARGS_1
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#define RESTOREARGS_4 RESTOREARGS_1
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