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* sysdeps/m68k/elf/start.S: Let __libc_start_main do most of the

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init stuff.
This commit is contained in:
Andreas Schwab 1998-03-11 01:32:12 +00:00
parent 2d4c61a667
commit 69235f764b
1 changed files with 22 additions and 34 deletions
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56
sysdeps/m68k/elf/start.S
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@ -1,5 +1,5 @@
/* Startup code compliant to the ELF m68k ABI. /* Startup code compliant to the ELF m68k ABI.
Copyright (C) 1996, 1997 Free Software Foundation, Inc. Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library. This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or The GNU C Library is free software; you can redistribute it and/or
@ -43,43 +43,31 @@ _start:
the outermost frame obviously. */ the outermost frame obviously. */
sub.l %fp, %fp sub.l %fp, %fp
/* %a1 contains the address of the shared library termination /* Extract the arguments as encoded on the stack and set up the
function, which we will register with `atexit' to be called by arguments for `main': argc, argv. envp will be determined
`exit'. */ later in __libc_start_main. */
tstl %a1
jbeq 1f
move.l %a1, -(%sp)
jbsr atexit
addql #4, %sp
1:
/* Do essential libc initialization. In statically linked
programs under the GNU Hurd, this is what sets up the
arguments on the stack for the code below. */
jbsr __libc_init_first
/* Extract the arguments and environment as encoded on the stack
and set up the arguments for `main': argc, argv, envp. */
move.l (%sp)+, %d0 /* Pop the argument count. */ move.l (%sp)+, %d0 /* Pop the argument count. */
lea (4,%sp,%d0*4), %a0 /* envp = &argv[argc + 1] */ move.l %sp, %a0 /* The argument vector starts just at the
move.l %a0, _environ /* Store it in the global variable. */ current stack top. */
pea (%a0) /* Push third argument: envp. */
pea 4(%sp) /* Push second argument: argv. */ pea (%a1) /* Push address of the shared library
termination function. */
/* Push the address of our own entry points to `.fini' and
`.init'. */
pea _fini
pea _init
pea (%a0) /* Push second argument: argv. */
move.l %d0, -(%sp) /* Push first argument: argc. */ move.l %d0, -(%sp) /* Push first argument: argc. */
/* Call `_init', which is the entry point to our own `.init' pea main
section; and register with `atexit' to have `exit' call
`_fini', which is the entry point to our own `.fini' section. */
jbsr _init
move.l #_fini, -(%sp)
jbsr atexit
addq.l #4, %sp
/* Call the user's main function, and exit with its value. */ /* Call the user's main function, and exit with its value. But
jbsr main let the libc call main. */
move.l %d0, (%sp) jbsr __libc_start_main
1: jbsr exit /* This should never return. */
jbra 1b /* Try again if somehow it does return. */ illegal /* Crash if somehow `exit' does return. */
/* Define a symbol for the first piece of initialized data. */ /* Define a symbol for the first piece of initialized data. */
.data .data