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Simplify _rtld_start() a little, and shave some cycles. Spefically, there's

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no need to save the stack pointer.  Just push the space for the cleanup
and obj_main pointers before calling _rtld(), and pop it after loading those
pointers into the appropriate argument registers for the program entry point.
This commit is contained in:
thorpej 1999-04-19 00:05:00 +00:00
parent 80deb5d223
commit 44672d5287
1 changed files with 22 additions and 24 deletions
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46
libexec/ld.elf_so/arch/alpha/rtld_start.S
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@ -1,4 +1,4 @@
/* $NetBSD: rtld_start.S,v 1.2 1999/04/18 23:12:59 thorpej Exp $ */
/* $NetBSD: rtld_start.S,v 1.3 1999/04/19 00:05:00 thorpej Exp $ */
/*
* Copyright 1996 Matt Thomas <matt@3am-software.com>
@ -40,20 +40,6 @@ LEAF_NOPROFILE(_rtld_start, 0)
br pv, L1
L1: LDGP(pv)
/*
* Save the stack pointer. This is what we will pass to _rtld().
*/
lda s0, 0(sp)
/*
* Make room for the atexit and cleanup vectors that _rtld() will
* provide to us.
*/
lda sp, -16(sp)
/* Save ps_strings pointer */
mov a3, s1
/* XXX Partially relocate ourself. */
/* Step 1 -- Figure out the displacement */
@ -87,18 +73,30 @@ L3: ldq t1, 0(t9) /* load the value */
bne t1, L3 /* no, do more */
/*
* Ya! Things are far enough so we can do some dynamic linking!
* Ya! Things are far enough so we can do some dynamic linking!
*/
lda a0, -16(s0)
CALL(_rtld) /* v0 = _rtld(sp); */
/* Sqirrel away ps_strings. */
mov a3, s0
/*
* Allocate space on the stack for the cleanup and obj_main
* entries that _rtld() will provide for us.
*/
lda sp, -16(sp)
mov sp, a0 /* v0 = _rtld(sp); */
CALL(_rtld)
ldq a1, 0(sp) /* cleanup */
ldq a2, 8(sp) /* obj_main */
lda sp, 16(sp) /* pop stack */
mov sp, a0 /* stack pointer */
mov s0, a3 /* ps_strings */
mov v0, pv /* set up PV for entry point */
ldq a1, -16(s0) /* our atexit function */
ldq a2, -8(s0) /* obj_main entry */
lda sp, 16(sp) /* readjust our stack */
mov s0, a0 /* stack pointer */
mov s1, a3 /* ps_strings pointer */
mov v0, t12
jsr ra, (v0), 0 /* (*_start)(sp, cleanup, obj, ps_strings); */
ldgp gp, 0(ra)