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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-04-20 16:02:07 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-04-21 14:52:32 +0200 |
| commit | eacf4c0202654adfa94bbb17b5c5c77c0be14af8 (patch) | |
| tree | 54b25866a30359f300f0a746d6acc99f663a2b23 /arch/powerpc/kernel/optprobes_head.S | |
| parent | powerpc/inst: ppc_inst_as_u64() becomes ppc_inst_as_ulong() (diff) | |
| download | linux-eacf4c0202654adfa94bbb17b5c5c77c0be14af8.tar.xz linux-eacf4c0202654adfa94bbb17b5c5c77c0be14af8.zip | |
powerpc: Enable OPTPROBES on PPC32
For that, create a 32 bits version of patch_imm64_load_insns()
and create a patch_imm_load_insns() which calls
patch_imm32_load_insns() on PPC32 and patch_imm64_load_insns()
on PPC64.
Adapt optprobes_head.S for PPC32. Use PPC_LL/PPC_STL macros instead
of raw ld/std, opt out things linked to paca and use stmw/lmw to
save/restore registers.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/bad58c66859b2a475c0ad516b53164ae3b4853cd.1618927318.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/optprobes_head.S')
| -rw-r--r-- | arch/powerpc/kernel/optprobes_head.S | 65 |
1 files changed, 34 insertions, 31 deletions
diff --git a/arch/powerpc/kernel/optprobes_head.S b/arch/powerpc/kernel/optprobes_head.S index ff8ba4d3824d..19ea3312403c 100644 --- a/arch/powerpc/kernel/optprobes_head.S +++ b/arch/powerpc/kernel/optprobes_head.S @@ -9,6 +9,16 @@ #include <asm/ptrace.h> #include <asm/asm-offsets.h> +#ifdef CONFIG_PPC64 +#define SAVE_30GPRS(base) SAVE_10GPRS(2,base); SAVE_10GPRS(12,base); SAVE_10GPRS(22,base) +#define REST_30GPRS(base) REST_10GPRS(2,base); REST_10GPRS(12,base); REST_10GPRS(22,base) +#define TEMPLATE_FOR_IMM_LOAD_INSNS nop; nop; nop; nop; nop +#else +#define SAVE_30GPRS(base) stmw r2, GPR2(base) +#define REST_30GPRS(base) lmw r2, GPR2(base) +#define TEMPLATE_FOR_IMM_LOAD_INSNS nop; nop; nop +#endif + #define OPT_SLOT_SIZE 65536 .balign 4 @@ -30,39 +40,41 @@ optinsn_slot: .global optprobe_template_entry optprobe_template_entry: /* Create an in-memory pt_regs */ - stdu r1,-INT_FRAME_SIZE(r1) + PPC_STLU r1,-INT_FRAME_SIZE(r1) SAVE_GPR(0,r1) /* Save the previous SP into stack */ addi r0,r1,INT_FRAME_SIZE - std r0,GPR1(r1) - SAVE_10GPRS(2,r1) - SAVE_10GPRS(12,r1) - SAVE_10GPRS(22,r1) + PPC_STL r0,GPR1(r1) + SAVE_30GPRS(r1) /* Save SPRS */ mfmsr r5 - std r5,_MSR(r1) + PPC_STL r5,_MSR(r1) li r5,0x700 - std r5,_TRAP(r1) + PPC_STL r5,_TRAP(r1) li r5,0 - std r5,ORIG_GPR3(r1) - std r5,RESULT(r1) + PPC_STL r5,ORIG_GPR3(r1) + PPC_STL r5,RESULT(r1) mfctr r5 - std r5,_CTR(r1) + PPC_STL r5,_CTR(r1) mflr r5 - std r5,_LINK(r1) + PPC_STL r5,_LINK(r1) mfspr r5,SPRN_XER - std r5,_XER(r1) + PPC_STL r5,_XER(r1) mfcr r5 - std r5,_CCR(r1) + PPC_STL r5,_CCR(r1) +#ifdef CONFIG_PPC64 lbz r5,PACAIRQSOFTMASK(r13) std r5,SOFTE(r1) +#endif /* * We may get here from a module, so load the kernel TOC in r2. * The original TOC gets restored when pt_regs is restored * further below. */ +#ifdef CONFIG_PPC64 ld r2,PACATOC(r13) +#endif .global optprobe_template_op_address optprobe_template_op_address: @@ -70,11 +82,8 @@ optprobe_template_op_address: * Parameters to optimized_callback(): * 1. optimized_kprobe structure in r3 */ - nop - nop - nop - nop - nop + TEMPLATE_FOR_IMM_LOAD_INSNS + /* 2. pt_regs pointer in r4 */ addi r4,r1,STACK_FRAME_OVERHEAD @@ -92,11 +101,7 @@ optprobe_template_call_handler: .global optprobe_template_insn optprobe_template_insn: /* 2, Pass instruction to be emulated in r4 */ - nop - nop - nop - nop - nop + TEMPLATE_FOR_IMM_LOAD_INSNS .global optprobe_template_call_emulate optprobe_template_call_emulate: @@ -107,20 +112,18 @@ optprobe_template_call_emulate: * All done. * Now, restore the registers... */ - ld r5,_MSR(r1) + PPC_LL r5,_MSR(r1) mtmsr r5 - ld r5,_CTR(r1) + PPC_LL r5,_CTR(r1) mtctr r5 - ld r5,_LINK(r1) + PPC_LL r5,_LINK(r1) mtlr r5 - ld r5,_XER(r1) + PPC_LL r5,_XER(r1) mtxer r5 - ld r5,_CCR(r1) + PPC_LL r5,_CCR(r1) mtcr r5 REST_GPR(0,r1) - REST_10GPRS(2,r1) - REST_10GPRS(12,r1) - REST_10GPRS(22,r1) + REST_30GPRS(r1) /* Restore the previous SP */ addi r1,r1,INT_FRAME_SIZE |