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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-05-23 19:21:35 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-26 09:48:59 +0300 |
| commit | f436cb969ab314b25edcabfc4b4f1442c1b83eb7 (patch) | |
| tree | cf4c9ec4af554354ab790c182f4450ae33aa2d55 /arch/s390/include/asm | |
| parent | c617e74f5b3e027f622eb109d94ab909cd69cdfa (diff) | |
| download | linux-f436cb969ab314b25edcabfc4b4f1442c1b83eb7.tar.xz | |
s390: extend expoline to BC instructions
[ Upstream commit 6deaa3bbca804b2a3627fd685f75de64da7be535 ]
The BPF JIT uses a 'b <disp>(%r<x>)' instruction in the definition
of the sk_load_word and sk_load_half functions.
Add support for branch-on-condition instructions contained in the
thunk code of an expoline.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/s390/include/asm')
| -rw-r--r-- | arch/s390/include/asm/nospec-insn.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/s390/include/asm/nospec-insn.h b/arch/s390/include/asm/nospec-insn.h index fcb6529de9b7..087fc9b972c5 100644 --- a/arch/s390/include/asm/nospec-insn.h +++ b/arch/s390/include/asm/nospec-insn.h @@ -29,10 +29,18 @@ __THUNK_PROLOG_NAME __s390x_indirect_jump_r\r2\()use_r\r1 .endm + .macro __THUNK_PROLOG_BC d0,r1,r2 + __THUNK_PROLOG_NAME __s390x_indirect_branch_\d0\()_\r2\()use_\r1 + .endm + .macro __THUNK_BR r1,r2 jg __s390x_indirect_jump_r\r2\()use_r\r1 .endm + .macro __THUNK_BC d0,r1,r2 + jg __s390x_indirect_branch_\d0\()_\r2\()use_\r1 + .endm + .macro __THUNK_BRASL r1,r2,r3 brasl \r1,__s390x_indirect_jump_r\r3\()use_r\r2 .endm @@ -75,6 +83,23 @@ .endif .endm + .macro __DECODE_DRR expand,disp,reg,ruse + .set __decode_fail,1 + .irp r1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 + .ifc \reg,%r\r1 + .irp r2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 + .ifc \ruse,%r\r2 + \expand \disp,\r1,\r2 + .set __decode_fail,0 + .endif + .endr + .endif + .endr + .if __decode_fail == 1 + .error "__DECODE_DRR failed" + .endif + .endm + .macro __THUNK_EX_BR reg,ruse #ifdef CONFIG_HAVE_MARCH_Z10_FEATURES exrl 0,555f @@ -87,12 +112,30 @@ 555: br \reg .endm + .macro __THUNK_EX_BC disp,reg,ruse +#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES + exrl 0,556f + j . +#else + larl \ruse,556f + ex 0,0(\ruse) + j . +#endif +556: b \disp(\reg) + .endm + .macro GEN_BR_THUNK reg,ruse=%r1 __DECODE_RR __THUNK_PROLOG_BR,\reg,\ruse __THUNK_EX_BR \reg,\ruse __THUNK_EPILOG .endm + .macro GEN_B_THUNK disp,reg,ruse=%r1 + __DECODE_DRR __THUNK_PROLOG_BC,\disp,\reg,\ruse + __THUNK_EX_BC \disp,\reg,\ruse + __THUNK_EPILOG + .endm + .macro BR_EX reg,ruse=%r1 557: __DECODE_RR __THUNK_BR,\reg,\ruse .pushsection .s390_indirect_branches,"a",@progbits @@ -100,6 +143,13 @@ .popsection .endm + .macro B_EX disp,reg,ruse=%r1 +558: __DECODE_DRR __THUNK_BC,\disp,\reg,\ruse + .pushsection .s390_indirect_branches,"a",@progbits + .long 558b-. + .popsection + .endm + .macro BASR_EX rsave,rtarget,ruse=%r1 559: __DECODE_RRR __THUNK_BRASL,\rsave,\rtarget,\ruse .pushsection .s390_indirect_branches,"a",@progbits @@ -111,10 +161,17 @@ .macro GEN_BR_THUNK reg,ruse=%r1 .endm + .macro GEN_B_THUNK disp,reg,ruse=%r1 + .endm + .macro BR_EX reg,ruse=%r1 br \reg .endm + .macro B_EX disp,reg,ruse=%r1 + b \disp(\reg) + .endm + .macro BASR_EX rsave,rtarget,ruse=%r1 basr \rsave,\rtarget .endm |