diff options
Diffstat (limited to 'libexec/rtld-aout/i386/mdprologue.S')
| -rw-r--r-- | libexec/rtld-aout/i386/mdprologue.S | 64 |
1 files changed, 18 insertions, 46 deletions
diff --git a/libexec/rtld-aout/i386/mdprologue.S b/libexec/rtld-aout/i386/mdprologue.S index 43640c6..1de0f72 100644 --- a/libexec/rtld-aout/i386/mdprologue.S +++ b/libexec/rtld-aout/i386/mdprologue.S @@ -27,7 +27,7 @@ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * - * $Id: mdprologue.S,v 1.4 1994/06/15 22:40:49 rich Exp $ + * $Id: mdprologue.S,v 1.7 1994/12/04 07:42:44 mycroft Exp $ */ /* @@ -35,7 +35,6 @@ */ #include <sys/syscall.h> -#define LCALL(x,y) .byte 0x9a ; .long y; .word x .text .globl _binder, _binder_entry @@ -46,76 +45,49 @@ _rtl: # crt0 calls us here pushl %ebp # Allocate stack frame - movl %esp, %ebp + movl %esp,%ebp pushl %ebx + call 1f # PIC function prologue 1: popl %ebx - addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx + addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx - movl 12(%ebp), %eax # Extract data from interface structure + movl 12(%ebp),%eax # Extract data from interface structure movl (%eax),%eax # base address of ld.so (first field) # setup arguments for rtld() - movl (%ebx), %ecx # 1st entry in GOT is our __DYNAMIC - addl %eax, %ecx # add load address + movl (%ebx),%ecx # 1st entry in GOT is our __DYNAMIC + addl %eax,%ecx # add load address pushl %ecx # 3rd arg pushl 12(%ebp) # 2nd arg == &crt. pushl 8(%ebp) # 1st arg == version - addl _rtld@GOT(%ebx), %eax # relocate address of function + addl _rtld@GOT(%ebx),%eax # relocate address of function call %eax # _rtld(version, crtp, DYNAMIC) addl $12,%esp # pop arguments - movl -4(%ebp), %ebx # restore %ebx - leave # remove stack frame, - ret # let's rock + popl %ebx + leave # remove stack frame + ret # First call to a procedure generally comes through here for # binding. _binder_entry: pushl %ebp # setup a stack frame - movl %esp, %ebp + movl %esp,%ebp pusha # save all regs - movl $0, %eax # clear - movl 4(%ebp), %esi # return address in PLT - movw (%esi), %ax # get hold of relocation number - subl $6, %esi # make it point to the jmpslot + xorl %eax,%eax # clear + movl 4(%ebp),%esi # return address in PLT + movw (%esi),%ax # get hold of relocation number + subl $6,%esi # make it point to the jmpslot pushl %eax # pushd arguments pushl %esi # call _binder@PLT # _binder(rpc, index) - addl $8, %esp # pop arguments - movl %eax, 4(%ebp) # return value from _binder() == actual + addl $8,%esp # pop arguments + movl %eax,4(%ebp) # return value from _binder() == actual # address of function popa # restore regs leave # remove our stack frame ret - - # Special system call stubs which return real and effective user and group - # id's. Saves overhead of making separate calls for each. - # !! Relies on compatability option in BSD 4.three-and-a-half - - .globl _getreuid, _getregid -_getreuid: - lea SYS_getuid, %eax - LCALL(7,0) - jc out - movl 4(%esp), %ecx # get 1st arg - movl %eax, (%ecx) # put value in it - movl 8(%esp), %ecx # same for 2nd arg - movl %edx, (%ecx) # - ret # done - -_getregid: - lea SYS_getgid, %eax - LCALL(7,0) - jc out - movl 4(%esp), %ecx # get 1st arg - movl %eax, (%ecx) # put value in it - movl 8(%esp), %ecx # same for 2nd arg - movl %edx, (%ecx) # - ret # done - -out: jmp cerror@PLT # Call common error routine - |
