AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-10 07:10:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

SH: makecontext: Improve understandability.

Browse Source
This commit is contained in:
Thomas Schwinge 2012-06-23 11:22:47 +02:00
parent d230f50a06
commit af1bce34ef
2 changed files with 34 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
ChangeLog
View File

@ -1,3 +1,8 @@
2012-06-23 Thomas Schwinge <thomas@codesourcery.com>
* sysdeps/unix/sysv/linux/sh/makecontext.S: Add comments and give more
meaningful names to some local labels.
2012-06-22 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Kaz Kojima <kkojima@rr.iij4u.or.jp>

58
sysdeps/unix/sysv/linux/sh/makecontext.S
View File

@ -1,5 +1,5 @@
/* Create new context.
Copyright (C) 2005 Free Software Foundation, Inc.
Copyright (C) 2005-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -33,44 +33,44 @@
.align 5
ENTRY(__makecontext)
mov #4, r3
mov.l @(oSS_SP,r4), r1
mov.l @(oSS_SIZE,r4), r2
add r1, r2
cmp/gt r6, r3
mov.l @(oSS_SP,r4), r1 /* r1 <- ucb->stack_base */
mov.l @(oSS_SIZE,r4), r2 /* r2 <- ucb->stack_size */
add r1, r2 /* r2 <- stack_top */
cmp/gt r6, r3 /* 4 > argc? */
bf/s 1f
shlr2 r2
shlr2 r2 /* r2 <- stack_top / 4 */
sub r6, r2
add r3, r2
1:
shll2 r2
shll2 r2 /* r2 <- stack_top - ((argc > 4) ? 4 * (argc - 4) : 0 */
mov #oR15, r0
mov.l @(oLINK,r4), r1
mov.l r2, @(r0,r4)
mov.l r1, @(oR8,r4)
mov.l r2, @(r0,r4) /* ucp->r15 <- r2 */
mov.l r1, @(oR8,r4) /* ucp->r8 <- ucp->uc_link */
mov #oPC, r0
mov.l r5, @(r0,r4)
mov.l r5, @(r0,r4) /* ucp->PC <- func */
cmp/pl r6
cmp/pl r6 /* argc > 0? */
bf/s .L1
dt r6
mov.l r7, @(oR4,r4)
cmp/pl r6
mov.l r7, @(oR4,r4) /* ucp->r4 <- argv[0] */
cmp/pl r6 /* argc > 1? */
bf/s .L1
dt r6
mov.l @(0,r15), r1
mov.l r1, @(oR5,r4)
cmp/pl r6
mov.l r1, @(oR5,r4) /* ucp->r5 <- argv[1] */
cmp/pl r6 /* argc > 2? */
bf/s .L1
dt r6
mov.l @(4,r15), r1
mov.l r1, @(oR6,r4)
cmp/pl r6
mov.l r1, @(oR6,r4) /* ucp->r6 <- argv[2] */
cmp/pl r6 /* argc > 3? */
bf/s .L1
dt r6
mov.l @(8,r15), r1
mov.l r1, @(oR7,r4)
mov.l r1, @(oR7,r4) /* ucp->r7 <- argv[3] */
mov #12,r0
.L0:
.L0: /* Save remaining argv[] on the stack. */
cmp/pl r6
bf/s .L1
dt r6
@ -87,7 +87,7 @@ ENTRY(__makecontext)
#endif
add #oPR, r4
rts
mov.l r0, @r4
mov.l r0, @r4 /* ucp->pr <- exitcode */
#ifndef PIC
.align 2
.L2:
@ -97,24 +97,24 @@ ENTRY(__makecontext)
.align 5
.Lexitcode:
tst r8, r8
tst r8, r8 /* ucb->uc_link == NULL? */
bt/s 2f
mov r8, r4
mov r8, r4 /* r4 <- ucb->uc_link */
#ifdef PIC
mova .Lgot, r0
mov.l .Lgot, r12
add r0, r12
mov.l .L3, r1
mov.l .Lsetcontext, r1
bsrf r1
.LPCS0:
nop
#else
mov.l .L3, r1
mov.l .Lsetcontext, r1
jsr @r1
nop
#endif
2:
mov.l .L4, r1
mov.l .Lexit, r1
#ifdef PIC
add r12, r1
#endif
@ -128,14 +128,14 @@ ENTRY(__makecontext)
#ifdef PIC
.Lgot:
.long _GLOBAL_OFFSET_TABLE_
.L3:
.Lsetcontext:
.long __setcontext@PLT-(.LPCS0+2-(.))
.L4:
.Lexit:
.long HIDDEN_JUMPTARGET(exit)@GOTOFF
#else
.L3:
.Lsetcontext:
.long __setcontext
.L4:
.Lexit:
.long HIDDEN_JUMPTARGET(exit)
#endif
cfi_startproc