arch/s390/include/asm/nospec-insn.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_S390_NOSPEC_ASM_H
   3 #define _ASM_S390_NOSPEC_ASM_H
   4
   5 #include <asm/alternative-asm.h>
   6 #include <asm/asm-offsets.h>
   7 #include <asm/dwarf.h>
   8
   9 #ifdef __ASSEMBLY__
  10
  11 #ifdef CC_USING_EXPOLINE
  12
  13 _LC_BR_R1 = __LC_BR_R1
  14
  15 /*
  16  * The expoline macros are used to create thunks in the same format
  17  * as gcc generates them. The 'comdat' section flag makes sure that
  18  * the various thunks are merged into a single copy.
  19  */
  20         .macro __THUNK_PROLOG_NAME name
  21         .pushsection .text.\name,"axG",@progbits,\name,comdat
  22         .globl \name
  23         .hidden \name
  24         .type \name,@function
  25 \name:
  26         CFI_STARTPROC
  27         .endm
  28
  29         .macro __THUNK_EPILOG
  30         CFI_ENDPROC
  31         .popsection
  32         .endm
  33
  34         .macro __THUNK_PROLOG_BR r1,r2
  35         __THUNK_PROLOG_NAME __s390_indirect_jump_r\r2\()use_r\r1
  36         .endm
  37
  38         .macro __THUNK_PROLOG_BC d0,r1,r2
  39         __THUNK_PROLOG_NAME __s390_indirect_branch_\d0\()_\r2\()use_\r1
  40         .endm
  41
  42         .macro __THUNK_BR r1,r2
  43         jg      __s390_indirect_jump_r\r2\()use_r\r1
  44         .endm
  45
  46         .macro __THUNK_BC d0,r1,r2
  47         jg      __s390_indirect_branch_\d0\()_\r2\()use_\r1
  48         .endm
  49
  50         .macro __THUNK_BRASL r1,r2,r3
  51         brasl   \r1,__s390_indirect_jump_r\r3\()use_r\r2
  52         .endm
  53
  54         .macro  __DECODE_RR expand,reg,ruse
  55         .set __decode_fail,1
  56         .irp r1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
  57         .ifc \reg,%r\r1
  58         .irp r2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
  59         .ifc \ruse,%r\r2
  60         \expand \r1,\r2
  61         .set __decode_fail,0
  62         .endif
  63         .endr
  64         .endif
  65         .endr
  66         .if __decode_fail == 1
  67         .error "__DECODE_RR failed"
  68         .endif
  69         .endm
  70
  71         .macro  __DECODE_RRR expand,rsave,rtarget,ruse
  72         .set __decode_fail,1
  73         .irp r1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
  74         .ifc \rsave,%r\r1
  75         .irp r2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
  76         .ifc \rtarget,%r\r2
  77         .irp r3,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
  78         .ifc \ruse,%r\r3
  79         \expand \r1,\r2,\r3
  80         .set __decode_fail,0
  81         .endif
  82         .endr
  83         .endif
  84         .endr
  85         .endif
  86         .endr
  87         .if __decode_fail == 1
  88         .error "__DECODE_RRR failed"
  89         .endif
  90         .endm
  91
  92         .macro  __DECODE_DRR expand,disp,reg,ruse
  93         .set __decode_fail,1
  94         .irp r1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
  95         .ifc \reg,%r\r1
  96         .irp r2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
  97         .ifc \ruse,%r\r2
  98         \expand \disp,\r1,\r2
  99         .set __decode_fail,0
 100         .endif
 101         .endr
 102         .endif
 103         .endr
 104         .if __decode_fail == 1
 105         .error "__DECODE_DRR failed"
 106         .endif
 107         .endm
 108
 109         .macro __THUNK_EX_BR reg,ruse
 110         # Be very careful when adding instructions to this macro!
 111         # The ALTERNATIVE replacement code has a .+10 which targets
 112         # the "br \reg" after the code has been patched.
 113 #ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
 114         exrl    0,555f
 115         j       .
 116 #else
 117         .ifc \reg,%r1
 118         ALTERNATIVE "ex %r0,_LC_BR_R1", ".insn ril,0xc60000000000,0,.+10", 35
 119         j       .
 120         .else
 121         larl    \ruse,555f
 122         ex      0,0(\ruse)
 123         j       .
 124         .endif
 125 #endif
 126 555:    br      \reg
 127         .endm
 128
 129         .macro __THUNK_EX_BC disp,reg,ruse
 130 #ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
 131         exrl    0,556f
 132         j       .
 133 #else
 134         larl    \ruse,556f
 135         ex      0,0(\ruse)
 136         j       .
 137 #endif
 138 556:    b       \disp(\reg)
 139         .endm
 140
 141         .macro GEN_BR_THUNK reg,ruse=%r1
 142         __DECODE_RR __THUNK_PROLOG_BR,\reg,\ruse
 143         __THUNK_EX_BR \reg,\ruse
 144         __THUNK_EPILOG
 145         .endm
 146
 147         .macro GEN_B_THUNK disp,reg,ruse=%r1
 148         __DECODE_DRR __THUNK_PROLOG_BC,\disp,\reg,\ruse
 149         __THUNK_EX_BC \disp,\reg,\ruse
 150         __THUNK_EPILOG
 151         .endm
 152
 153         .macro BR_EX reg,ruse=%r1
 154 557:    __DECODE_RR __THUNK_BR,\reg,\ruse
 155         .pushsection .s390_indirect_branches,"a",@progbits
 156         .long   557b-.
 157         .popsection
 158         .endm
 159
 160          .macro B_EX disp,reg,ruse=%r1
 161 558:    __DECODE_DRR __THUNK_BC,\disp,\reg,\ruse
 162         .pushsection .s390_indirect_branches,"a",@progbits
 163         .long   558b-.
 164         .popsection
 165         .endm
 166
 167         .macro BASR_EX rsave,rtarget,ruse=%r1
 168 559:    __DECODE_RRR __THUNK_BRASL,\rsave,\rtarget,\ruse
 169         .pushsection .s390_indirect_branches,"a",@progbits
 170         .long   559b-.
 171         .popsection
 172         .endm
 173
 174 #else
 175         .macro GEN_BR_THUNK reg,ruse=%r1
 176         .endm
 177
 178         .macro GEN_B_THUNK disp,reg,ruse=%r1
 179         .endm
 180
 181          .macro BR_EX reg,ruse=%r1
 182         br      \reg
 183         .endm
 184
 185          .macro B_EX disp,reg,ruse=%r1
 186         b       \disp(\reg)
 187         .endm
 188
 189         .macro BASR_EX rsave,rtarget,ruse=%r1
 190         basr    \rsave,\rtarget
 191         .endm
 192 #endif /* CC_USING_EXPOLINE */
 193
 194 #endif /* __ASSEMBLY__ */
 195
 196 #endif /* _ASM_S390_NOSPEC_ASM_H */