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[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / sh / makecontext.S

diff --git a/sysdeps/unix/sysv/linux/sh/makecontext.S b/sysdeps/unix/sysv/linux/sh/makecontext.S
index 877d78d3969d012ad44c2a73b291d52fc3ca7596..6221913871d5d30414f99750a782a569a4f630bc 100644 (file)
--- a/sysdeps/unix/sysv/linux/sh/makecontext.S
+++ b/sysdeps/unix/sysv/linux/sh/makecontext.S
@@ -1,5 +1,5 @@
 /* Create new context.
-   Copyright (C) 2005 Free Software Foundation, Inc.
+   Copyright (C) 2005-2014 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
@@ -13,11 +13,11 @@
    Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include <abort-instr.h>
 
 #include "ucontext_i.h"
 
@@ -34,44 +34,44 @@
        .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  r3, r6                  /* argc > 4? */
        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
@@ -88,7 +88,7 @@ ENTRY(__makecontext)
 #endif
        add     #oPR, r4
        rts
-        mov.l  r0, @r4
+        mov.l  r0, @r4         /* ucp->pr <- exitcode */
 #ifndef PIC
        .align  2
 .L2:
@@ -97,49 +97,64 @@ ENTRY(__makecontext)
        cfi_endproc
 
        .align  5
+       cfi_startproc
 .Lexitcode:
-       tst     r8, r8
-       bt/s    2f
-        mov    r8, r4
 #ifdef PIC
+       mov.l   r12, @-r15
+       cfi_adjust_cfa_offset (4)
+       cfi_rel_offset (r12, 0)
        mova    .Lgot, r0
        mov.l   .Lgot, r12
        add     r0, r12
-       mov.l   .L3, r1
+#endif
+       tst     r8, r8          /* ucb->uc_link == NULL? */
+       bt/s    2f
+        mov    r8, r4          /* r4 <- ucb->uc_link */
+       mov.l   .Lsetcontext, r1
+       sts.l   pr, @-r15
+       cfi_adjust_cfa_offset (4)
+       cfi_rel_offset (pr, 0)
+#ifdef PIC
        bsrf    r1
 .LPCS0:
         nop
 #else
-       mov.l   .L3, r1
        jsr     @r1
         nop
 #endif
+        /* Restore to keep CFI/CFA balanced.  */
+       lds.l   @r15+, pr
+       cfi_adjust_cfa_offset (-4)
+       cfi_restore (pr)
+       /* If this returns (which can happen if the syscall fails) we'll exit
+          the program with the return error value (-1).  */
+       mov     r0, r4
+
 2:
-       mov.l   .L4, r1
+       mov.l   .Lexit, r1
 #ifdef PIC
        add     r12, r1
 #endif
        jsr     @r1
-        mov    r0, r4
-0:
-       bra     0b
         nop
+       /* The 'exit' call should never return.  In case it does cause the
+          process to terminate.  */
+       ABORT_INSTRUCTION_ASM
 
        .align  2
 #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
 PSEUDO_END(__makecontext)
 
 weak_alias (__makecontext, makecontext)