sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S

   1 /* Set saved user context to current context.  C-SKY ABIV2 version.
   2    Copyright (C) 2018-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20
  21 #include "ucontext_i.h"
  22
  23 /* int setcontext (const ucontext_t *ucp) */
  24
  25 ENTRY (__setcontext)
  26         mov     t0, a0
  27         subi    sp, 8
  28         stw     a0, (sp, 0)
  29
  30         /* Set sigmask.  */
  31         movi    a0, SIG_SETMASK
  32         addi    a1, t0, UCONTEXT_SIGMASK
  33         movi    a2, 0
  34
  35         /* Do sigprocmask syscall.  */
  36 #ifdef __PIC__
  37         subi    sp, 8
  38         stw     gb, (sp, 0)
  39         grs     gb, .Lgetpc1
  40 .Lgetpc1:
  41         lrw     a3, .Lgetpc1@GOTPC
  42         addu    gb, gb, a3
  43         lrw     a3, __sigprocmask@PLT
  44         ldr.w   a3, (gb, a3 << 0)
  45         jsr     a3
  46         ldw     gb, (sp, 0)
  47         addi    sp, 8
  48 #else
  49         jsri    __sigprocmask
  50 #endif /* __PIC__ */
  51
  52         ldw     t0, (sp, 0)
  53         addi    sp, 8
  54         /* Set r0-r11. Load a0-a3, for makecontext requires.  */
  55         addi    t1, t0, MCONTEXT_CSKY_A0
  56         ldm     r0-r11, (t1)
  57         ldw     sp, (t0, MCONTEXT_CSKY_SP)      /* Load sp.  */
  58         ldw     r15, (t0, MCONTEXT_CSKY_LR)     /* Load lr.  */
  59         ldw     t0, (t0, MCONTEXT_CSKY_PC)      /* Load start addr.  */
  60         jmp     t0
  61 END (setcontext)
  62 weak_alias (__setcontext, setcontext)
  63
  64 ENTRY (__startcontext)
  65         .cfi_label .Ldummy
  66         cfi_undefined (lr)
  67         mov     a0, r9
  68         cmpnei  r9, 0   /* r9 was set in makecontext.  */
  69         bf      1f      /* null, then exit.  */
  70
  71         /* Call setcontext.  */
  72 #ifdef __PIC__
  73         grs     t1, .Lgetpc2
  74 .Lgetpc2:
  75         lrw     t0, .Lgetpc2@GOTPC
  76         addu    t1, t1, t0
  77         lrw     t0, __setcontext@GOT
  78         ldr.w   t0, (t1, t0 << 0)
  79 #else
  80         lrw     t0, __setcontext
  81 #endif
  82         jsr     t0
  83
  84 1:
  85         /* Call _exit.  */
  86 #ifdef __PIC__
  87         grs     t1, .Lgetpc3
  88 .Lgetpc3:
  89         lrw     t0, .Lgetpc3@GOTPC
  90         addu    t1, t1, t0
  91         lrw     t0, _exit@GOT
  92         ldr.w   t0, (t1, t0 << 0)
  93 #else
  94         lrw     t0, _exit
  95 #endif
  96         jsr     t0
  97
  98 END (__startcontext)