libitm/config/arm/sjlj.S

   1 /* Copyright (C) 2011-2020 Free Software Foundation, Inc.
   2    Contributed by Richard Henderson <rth@redhat.com>.
   3
   4    This file is part of the GNU Transactional Memory Library (libitm).
   5
   6    Libitm is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
  12    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14    more details.
  15
  16    Under Section 7 of GPL version 3, you are granted additional
  17    permissions described in the GCC Runtime Library Exception, version
  18    3.1, as published by the Free Software Foundation.
  19
  20    You should have received a copy of the GNU General Public License and
  21    a copy of the GCC Runtime Library Exception along with this program;
  22    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23    <http://www.gnu.org/licenses/>.  */
  24
  25 #include "hwcap.h"
  26 #include "asmcfi.h"
  27
  28         .syntax unified
  29
  30 #if defined(__thumb2__)
  31 # define PC_OFS 4
  32         .thumb
  33         .thumb_func
  34 #else
  35 # define PC_OFS 8
  36 #endif
  37
  38 #if defined (__thumb2__) && defined(__ARM_ARCH_6T2__)
  39 # define HAVE_MOVT
  40         .arch   armv6t2
  41 #elif defined (__ARM_ARCH_7A__)
  42 # define HAVE_MOVT
  43         .arch   armv7-a
  44 #elif defined (__ARM_ARCH_7R__)
  45 # define HAVE_MOVT
  46         .arch   armv7-r
  47 #elif defined (__ARM_ARCH_7M__)
  48 # define HAVE_MOVT
  49         .arch   armv7-m
  50 #endif
  51
  52 #if defined(__FDPIC__)
  53 .macro ldaddr reg, addr
  54         ldr \reg, 99f
  55         add \reg, \reg, r9
  56 .subsection 1
  57         .align  2
  58 99:     .word   \addr(GOTOFF)
  59 .subsection 0
  60 .endm
  61 #elif defined(HAVE_MOVT) && defined(PIC)
  62 .macro ldaddr reg, addr
  63         movw    \reg, #:lower16:(\addr - (98f + PC_OFS))
  64         movt    \reg, #:upper16:(\addr - (98f + PC_OFS))
  65 98:     add     \reg, \reg, pc
  66 .endm
  67 #elif defined(HAVE_MOVT)
  68 .macro ldaddr reg, addr
  69         movw    \reg, #:lower16:\addr
  70         movt    \reg, #:upper16:\addr
  71 .endm
  72 #elif defined(PIC)
  73 .macro ldaddr reg, addr
  74         ldr     \reg, 99f
  75 98:     add     \reg, \reg, pc
  76 .subsection 1
  77         .align  2
  78 99:     .word   \addr - (98b + PC_OFS)
  79 .subsection 0
  80 .endm
  81 #else
  82 .macro ldaddr reg, addr
  83         ldr     \reg, =\addr
  84 .endm
  85 #endif
  86
  87         .text
  88         .align  2
  89         .global _ITM_beginTransaction
  90         .type   _ITM_beginTransaction, %function
  91
  92 _ITM_beginTransaction:
  93         .fnstart
  94         cfi_startproc
  95         mov     ip, sp
  96         push    { r4-r11, ip, lr }
  97         .save   { lr }
  98         .pad    #(9*4)
  99         cfi_adjust_cfa_offset(40)
 100         cfi_rel_offset(lr, 36)
 101         sub     sp, sp, #(14*8)
 102         .pad    #(14*8)
 103         cfi_adjust_cfa_offset(14*8)
 104
 105         ldaddr  r2, GTM_hwcap
 106         ldr     r2, [r2]
 107
 108         /* Store the VFP registers.  Don't use VFP instructions directly
 109            because this code is used in non-VFP multilibs.  */
 110         tst     r2, #HWCAP_ARM_VFP
 111         beq     1f
 112         stc     p11, cr8, [sp], {16}    /* vstm sp, {d8-d15} */
 113 1:
 114         /* Save the call-preserved iWMMXt registers.  */
 115         tst     r2, #HWCAP_ARM_IWMMXT
 116         beq     1f
 117         stcl    p1, cr10, [sp, #64]     /* wstrd wr10, [sp, #64] */
 118         stcl    p1, cr11, [sp, #72]
 119         stcl    p1, cr12, [sp, #80]
 120         stcl    p1, cr13, [sp, #88]
 121         stcl    p1, cr14, [sp, #96]
 122         stcl    p1, cr15, [sp, #104]
 123 1:
 124         /* Invoke GTM_begin_transaction with the struct we just built.  */
 125         mov     r1, sp
 126         bl      GTM_begin_transaction
 127
 128         /* Return; we don't need to restore any of the call-saved regs.  */
 129         add     sp, sp, #(14*8 + 9*4)
 130         cfi_adjust_cfa_offset(-(14*8 + 9*4))
 131         pop     { pc }
 132         .fnend
 133         cfi_endproc
 134         .size   _ITM_beginTransaction, . - _ITM_beginTransaction
 135
 136         .align  2
 137         .global GTM_longjmp
 138         .hidden GTM_longjmp
 139         .type   GTM_longjmp, %function
 140
 141 GTM_longjmp:
 142         cfi_startproc
 143         ldaddr  r2, GTM_hwcap
 144         ldr     r2, [r2]
 145
 146         tst     r2, #HWCAP_ARM_VFP
 147         beq     1f
 148         ldc     p11, cr8, [r1], {16}    /* vldmia r1, {d8-d15} */
 149 1:
 150         tst     r2, #HWCAP_ARM_IWMMXT
 151         beq     1f
 152         ldcl    p1, cr10, [r1, #64]     /* wldrd wr10, [r1, #64] */
 153         ldcl    p1, cr11, [r1, #72]
 154         ldcl    p1, cr12, [r1, #80]
 155         ldcl    p1, cr13, [r1, #88]
 156         ldcl    p1, cr14, [r1, #96]
 157         ldcl    p1, cr15, [r1, #104]
 158 1:
 159         add     r1, r1, #(14*8)         /* Skip both VFP and iWMMXt blocks */
 160 #ifdef __thumb2__
 161         ldm     r1, { r4-r11, ip, lr }
 162         cfi_def_cfa(ip, 0)
 163         mov     sp, ip
 164         bx      lr
 165 #else
 166         ldm     r1, { r4-r11, sp, pc }
 167 #endif
 168         cfi_endproc
 169         .size   GTM_longjmp, . - GTM_longjmp
 170
 171 #ifdef __linux__
 172 .section .note.GNU-stack, "", %progbits
 173 #endif