sysdeps/powerpc/powerpc64/setjmp-common.S

   1 /* setjmp for PowerPC64.
   2    Copyright (C) 1995-2016 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 #include <stap-probe.h>
  21 #define _ASM
  22 #ifdef __NO_VMX__
  23 #include <novmxsetjmp.h>
  24 #else
  25 #include <jmpbuf-offsets.h>
  26 #endif
  27
  28 #ifndef __NO_VMX__
  29         .section        ".toc","aw"
  30 .LC__dl_hwcap:
  31 # ifdef SHARED
  32 #  if IS_IN (rtld)
  33         /* Inside ld.so we use the local alias to avoid runtime GOT
  34            relocations.  */
  35         .tc _rtld_local_ro[TC],_rtld_local_ro
  36 #  else
  37         .tc _rtld_global_ro[TC],_rtld_global_ro
  38 #  endif
  39 # else
  40         .tc _dl_hwcap[TC],_dl_hwcap
  41 # endif
  42         .section ".text"
  43 #endif
  44
  45         .machine        "altivec"
  46 ENTRY (setjmp_symbol)
  47         CALL_MCOUNT 1
  48         li r4,1                 /* Set second argument to 1.  */
  49         b JUMPTARGET (GLUE(__sigsetjmp_symbol,_ent))
  50 END (setjmp_symbol)
  51
  52 #if defined SHARED && !IS_IN (rtld) && !defined __NO_VMX__
  53 /* When called from within libc we need a special version of _setjmp
  54    that saves r2 since the call won't go via a plt call stub.  See
  55    bugz #269.  __GI__setjmp is used in csu/libc-start.c when
  56    HAVE_CLEANUP_JMP_BUF is defined.  */
  57 ENTRY (__GI__setjmp)
  58         std r2,FRAME_TOC_SAVE(r1)               /* Save the callers TOC in the save area.  */
  59         CALL_MCOUNT 1
  60         li r4,0                 /* Set second argument to 0.  */
  61         b JUMPTARGET (GLUE(__sigsetjmp_symbol,_ent))
  62 END (__GI__setjmp)
  63 #endif
  64
  65 ENTRY (_setjmp_symbol)
  66         CALL_MCOUNT 1
  67         li r4,0                 /* Set second argument to 0.  */
  68         b JUMPTARGET (GLUE(__sigsetjmp_symbol,_ent))
  69 END (_setjmp_symbol)
  70 libc_hidden_def (_setjmp_symbol)
  71
  72 ENTRY (__sigsetjmp_symbol)
  73         CALL_MCOUNT 2
  74 JUMPTARGET(GLUE(__sigsetjmp_symbol,_ent)):
  75 #ifdef PTR_MANGLE
  76         mr   r5, r1
  77         PTR_MANGLE (r5, r6)
  78         std  r5,(JB_GPR1*8)(3)
  79 #else
  80         std  r1,(JB_GPR1*8)(3)
  81 #endif
  82         mflr r0
  83 #if defined SHARED && !IS_IN (rtld)
  84         ld   r5,FRAME_TOC_SAVE(r1)      /* Retrieve the callers TOC.  */
  85         std  r5,(JB_GPR2*8)(3)
  86 #else
  87         std  r2,(JB_GPR2*8)(3)
  88 #endif
  89         /* setjmp probe expects longjmp first argument (8@3), second argument
  90            (-4@4), and target address (8@0), respectively.  */
  91         LIBC_PROBE (setjmp, 3, 8@3, -4@4, 8@0)
  92         std  r14,((JB_GPRS+0)*8)(3)
  93         stfd fp14,((JB_FPRS+0)*8)(3)
  94 #ifdef PTR_MANGLE
  95         PTR_MANGLE2 (r0, r6)
  96 #endif
  97         std  r0,(JB_LR*8)(3)
  98         std  r15,((JB_GPRS+1)*8)(3)
  99         stfd fp15,((JB_FPRS+1)*8)(3)
 100         mfcr r0
 101         std  r16,((JB_GPRS+2)*8)(3)
 102         stfd fp16,((JB_FPRS+2)*8)(3)
 103         stw  r0,((JB_CR*8)+4)(3)        /* 32-bit CR.  */
 104         std  r17,((JB_GPRS+3)*8)(3)
 105         stfd fp17,((JB_FPRS+3)*8)(3)
 106         std  r18,((JB_GPRS+4)*8)(3)
 107         stfd fp18,((JB_FPRS+4)*8)(3)
 108         std  r19,((JB_GPRS+5)*8)(3)
 109         stfd fp19,((JB_FPRS+5)*8)(3)
 110         std  r20,((JB_GPRS+6)*8)(3)
 111         stfd fp20,((JB_FPRS+6)*8)(3)
 112         std  r21,((JB_GPRS+7)*8)(3)
 113         stfd fp21,((JB_FPRS+7)*8)(3)
 114         std  r22,((JB_GPRS+8)*8)(3)
 115         stfd fp22,((JB_FPRS+8)*8)(3)
 116         std  r23,((JB_GPRS+9)*8)(3)
 117         stfd fp23,((JB_FPRS+9)*8)(3)
 118         std  r24,((JB_GPRS+10)*8)(3)
 119         stfd fp24,((JB_FPRS+10)*8)(3)
 120         std  r25,((JB_GPRS+11)*8)(3)
 121         stfd fp25,((JB_FPRS+11)*8)(3)
 122         std  r26,((JB_GPRS+12)*8)(3)
 123         stfd fp26,((JB_FPRS+12)*8)(3)
 124         std  r27,((JB_GPRS+13)*8)(3)
 125         stfd fp27,((JB_FPRS+13)*8)(3)
 126         std  r28,((JB_GPRS+14)*8)(3)
 127         stfd fp28,((JB_FPRS+14)*8)(3)
 128         std  r29,((JB_GPRS+15)*8)(3)
 129         stfd fp29,((JB_FPRS+15)*8)(3)
 130         std  r30,((JB_GPRS+16)*8)(3)
 131         stfd fp30,((JB_FPRS+16)*8)(3)
 132         std  r31,((JB_GPRS+17)*8)(3)
 133         stfd fp31,((JB_FPRS+17)*8)(3)
 134 #ifndef __NO_VMX__
 135         ld    r6,.LC__dl_hwcap@toc(r2)
 136 # ifdef SHARED
 137         /* Load _rtld-global._dl_hwcap.  */
 138         ld    r6,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r6)
 139 # else
 140         ld    r6,0(r6) /* Load extern _dl_hwcap.  */
 141 # endif
 142         andis.  r6,r6,(PPC_FEATURE_HAS_ALTIVEC >> 16)
 143         beq     L(no_vmx)
 144         la      r5,((JB_VRS)*8)(3)
 145         andi.   r6,r5,0xf
 146         mfspr   r0,VRSAVE
 147         stw     r0,((JB_VRSAVE)*8)(3)   /* 32-bit VRSAVE.  */
 148         addi    r6,r5,16
 149         beq+    L(aligned_save_vmx)
 150
 151         lvsr    v0,0,r5
 152         lvsl    v1,0,r5
 153         addi    r6,r5,-16
 154
 155 # define save_misaligned_vmx(savevr,prevvr,shiftvr,tmpvr,savegpr,addgpr) \
 156         addi    addgpr,addgpr,32;                                        \
 157         vperm   tmpvr,prevvr,savevr,shiftvr;                             \
 158         stvx    tmpvr,0,savegpr
 159
 160         /*
 161          * We have to be careful not to corrupt the data below v20 and
 162          * above v31. To keep things simple we just rotate both ends in
 163          * the opposite direction to our main permute so we can use
 164          * the common macro.
 165          */
 166
 167         /* load and rotate data below v20 */
 168         lvx     v2,0,r5
 169         vperm   v2,v2,v2,v1
 170         save_misaligned_vmx(v20,v2,v0,v3,r5,r6)
 171         save_misaligned_vmx(v21,v20,v0,v3,r6,r5)
 172         save_misaligned_vmx(v22,v21,v0,v3,r5,r6)
 173         save_misaligned_vmx(v23,v22,v0,v3,r6,r5)
 174         save_misaligned_vmx(v24,v23,v0,v3,r5,r6)
 175         save_misaligned_vmx(v25,v24,v0,v3,r6,r5)
 176         save_misaligned_vmx(v26,v25,v0,v3,r5,r6)
 177         save_misaligned_vmx(v27,v26,v0,v3,r6,r5)
 178         save_misaligned_vmx(v28,v27,v0,v3,r5,r6)
 179         save_misaligned_vmx(v29,v28,v0,v3,r6,r5)
 180         save_misaligned_vmx(v30,v29,v0,v3,r5,r6)
 181         save_misaligned_vmx(v31,v30,v0,v3,r6,r5)
 182         /* load and rotate data above v31 */
 183         lvx     v2,0,r6
 184         vperm   v2,v2,v2,v1
 185         save_misaligned_vmx(v2,v31,v0,v3,r5,r6)
 186
 187         b       L(no_vmx)
 188
 189 L(aligned_save_vmx):
 190         stvx    20,0,r5
 191         addi    r5,r5,32
 192         stvx    21,0,r6
 193         addi    r6,r6,32
 194         stvx    22,0,r5
 195         addi    r5,r5,32
 196         stvx    23,0,r6
 197         addi    r6,r6,32
 198         stvx    24,0,r5
 199         addi    r5,r5,32
 200         stvx    25,0,r6
 201         addi    r6,r6,32
 202         stvx    26,0,r5
 203         addi    r5,r5,32
 204         stvx    27,0,r6
 205         addi    r6,r6,32
 206         stvx    28,0,r5
 207         addi    r5,r5,32
 208         stvx    29,0,r6
 209         addi    r6,r6,32
 210         stvx    30,0,r5
 211         stvx    31,0,r6
 212 L(no_vmx):
 213 #else
 214         li      r6,0
 215 #endif
 216 #if IS_IN (rtld)
 217         li      r3,0
 218         blr
 219 #elif defined SHARED
 220         b       JUMPTARGET (__sigjmp_save_symbol)
 221 #else
 222         mflr    r0
 223         std     r0,FRAME_LR_SAVE(r1)
 224         stdu    r1,-FRAME_MIN_SIZE(r1)
 225         cfi_adjust_cfa_offset(FRAME_MIN_SIZE)
 226         cfi_offset(lr,FRAME_LR_SAVE)
 227         bl      JUMPTARGET (__sigjmp_save_symbol)
 228         nop
 229         ld      r0,FRAME_MIN_SIZE+FRAME_LR_SAVE(r1)
 230         addi    r1,r1,FRAME_MIN_SIZE
 231         mtlr    r0
 232         blr
 233 #endif
 234 END (__sigsetjmp_symbol)