diff options
Diffstat (limited to 'sysdeps/sparc/sparc32/elf/start.S')
| -rw-r--r-- | sysdeps/sparc/sparc32/elf/start.S | 68 |
1 files changed, 21 insertions, 47 deletions
diff --git a/sysdeps/sparc/sparc32/elf/start.S b/sysdeps/sparc/sparc32/elf/start.S index 24715e68be..d45e0cedf4 100644 --- a/sysdeps/sparc/sparc32/elf/start.S +++ b/sysdeps/sparc/sparc32/elf/start.S @@ -1,5 +1,5 @@ /* Startup code for elf32-sparc - Copyright (C) 1997 Free Software Foundation, Inc. + Copyright (C) 1997, 1998 Free Software Foundation, Inc. Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997. The GNU C Library is free software; you can redistribute it and/or @@ -31,56 +31,30 @@ _start: mov %g0, %fp sub %sp, 6*4, %sp - /* Save %g1. When starting a binary via the dynamic linker, %g1 - contains the address of the shared library termination function, - which we will register below with atexit() to be called by exit(). - If we are statically linked, this will be NULL. */ - - /* Do essential libc initialization (sp points to argc, argv, and envp) */ - call __libc_init_first - mov %g1, %l0 - - /* Now that we have the proper stack frame, register library termination - function, if there is any: */ - - cmp %l0, 0 - beq 1f - nop - call atexit - mov %l0, %o0 -1: - /* Extract the arguments and environment as encoded on the stack. The argument info starts after one register window (16 words) past the SP. */ - ld [%sp+22*4], %o0 - add %sp, 23*4, %o1 - sll %o0, 2, %o2 - add %o2, %o1, %o2 - sethi %hi(__environ), %g2 - add %o2, 4, %o2 - st %o2, [%g2+%lo(__environ)] - - mov %o0, %l0 /* tuck them away */ - mov %o1, %l1 - - /* Call _init, the entry point to our own .init section. */ - call _init - mov %o2, %l2 - - /* Register our .fini section with atexit. */ - sethi %hi(_fini), %o0 - call atexit - add %o0, %lo(_fini), %o0 - - /* Call the user's main and exit with its return value. */ - mov %l0, %o0 - mov %l1, %o1 - call main - mov %l2, %o2 - call exit + ld [%sp+22*4], %o1 + add %sp, 23*4, %o2 + + /* Load the addresses of the user entry points. */ + sethi %hi(main), %o0 + sethi %hi(_init), %o3 + sethi %hi(_fini), %o4 + or %o0, %lo(main), %o0 + or %o3, %lo(_init), %o3 + or %o4, %lo(_fini), %o4 + + /* When starting a binary via the dynamic linker, %g1 contains the + address of the shared library termination function, which will be + registered with atexit(). If we are statically linked, this will + be NULL. */ + mov %g1, %o5 + + /* Let libc do the rest of the initialization, and call main. */ + call __libc_start_main nop /* Die very horribly if exit returns. */ unimp - .size _start,.-_start + .size _start, .-_start |