diff options
| author | Roland McGrath <roland@gnu.org> | 1995-10-19 02:20:22 +0000 |
|---|---|---|
| committer | Roland McGrath <roland@gnu.org> | 1995-10-19 02:20:22 +0000 |
| commit | 1d234146c04ec6a6bad50e6d1bf74cf6ff189e7a (patch) | |
| tree | 2312fa6c66d401746ee00f956dc5f5534252461b /sysdeps | |
| parent | 580c1888bec85d6ec20b8c9d3b893b5397a71325 (diff) | |
| download | glibc-1d234146c04ec6a6bad50e6d1bf74cf6ff189e7a.tar.gz glibc-1d234146c04ec6a6bad50e6d1bf74cf6ff189e7a.tar.xz glibc-1d234146c04ec6a6bad50e6d1bf74cf6ff189e7a.zip | |
* sysdeps/unix/sysv/linux/i386/sysdep.h (PSEUDO): Use
SYSCALL_PIC_SETUP before jumping to syscall_error. * sysdeps/unix/i386/sysdep.h (SYSCALL_PIC_SETUP): New macro. (PSEUDO): Use it before jumping to syscall_error. * sysdeps/unix/i386/sysdep.S [! PIC]: Don't find GOT address; expect it in %ebx on entry. Pop old %ebx value off stack after using it.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/i386/sysdep.S | 10 | ||||
| -rw-r--r-- | sysdeps/unix/i386/sysdep.h | 14 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/sysdep.h | 4 |
3 files changed, 19 insertions, 9 deletions
diff --git a/sysdeps/unix/i386/sysdep.S b/sysdeps/unix/i386/sysdep.S index efe4f56e95..95e2fd5c7a 100644 --- a/sysdeps/unix/i386/sysdep.S +++ b/sysdeps/unix/i386/sysdep.S @@ -41,11 +41,11 @@ notb: #ifndef PIC movl %eax, C_SYMBOL_NAME(errno) #else - /* Standard PIC nonsense to store into `errno' through the GOT. */ - call here -here: popl %ecx - addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx - movl C_SYMBOL_NAME(errno@GOT)(%ecx), %ecx + /* The caller has pushed %ebx and then set it up to + point to the GOT before calling us through the PLT. */ + movl C_SYMBOL_NAME(errno@GOT)(%ebx), %ecx + /* Pop %ebx value saved before jumping here. */ + popl %ebx movl %eax, (%ecx) #endif movl $-1, %eax diff --git a/sysdeps/unix/i386/sysdep.h b/sysdeps/unix/i386/sysdep.h index 7fd77dd936..fb1781b156 100644 --- a/sysdeps/unix/i386/sysdep.h +++ b/sysdeps/unix/i386/sysdep.h @@ -42,15 +42,23 @@ Cambridge, MA 02139, USA. */ #endif #define PSEUDO(name, syscall_name, args) \ +lose: SYSCALL_PIC_SETUP \ + jmp JUMPTARGET(syscall_error) \ .globl syscall_error; \ ENTRY (name) \ DO_CALL (syscall_name, args); \ - jb JUMPTARGET(syscall_error) + jb lose #ifdef PIC -#define JUMPTARGET(name) name##@PLT +#define JUMPTARGET(name) name##@PLT +#define SYSCALL_PIC_SETUP \ + pushl %ebx; \ + call 0f; \ +0: popl %ebx; \ + addl $_GLOBAL_OFFSET_TABLE+[.-0b], %ebx; #else -#define JUMPTARGET(name) name +#define JUMPTARGET(name) name +#define SYSCALL_PIC_SETUP /* Nothing. */ #endif /* This is defined as a separate macro so that other sysdep.h files diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h index a40ca86e40..ccb484664f 100644 --- a/sysdeps/unix/sysv/linux/i386/sysdep.h +++ b/sysdeps/unix/sysv/linux/i386/sysdep.h @@ -42,12 +42,14 @@ Cambridge, MA 02139, USA. */ #undef PSEUDO #define PSEUDO(name, syscall_name, args) \ .text; \ + lose: SYSCALL_PIC_SETUP \ + jmp JUMPTARGET (syscall_error) \ .globl syscall_error; \ ENTRY (name) \ movl $SYS_ify (syscall_name), %eax; \ DO_CALL (args); \ testl %eax, %eax; \ - jl JUMPTARGET (syscall_error) + jl lose /* We define our own ENTRY macro because the alignment should be 16 for ELF. */ #undef ENTRY |