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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-06-17 18:51:02 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-06-24 17:06:55 +0300 |
| commit | 1df7d5e4baeac74d14c1bee18b2dff9302b3efbc (patch) | |
| tree | 0a2153f84ec8eeae5ecaa79d07f93dc42ca9e9af /arch/powerpc/kernel/entry_64.S | |
| parent | bf9155f1970c4dbf9ec6b87d3688433bd494a4e1 (diff) | |
| download | linux-1df7d5e4baeac74d14c1bee18b2dff9302b3efbc.tar.xz | |
powerpc/64s: introduce different functions to return from SRR vs HSRR interrupts
This makes no real difference yet except that HSRR type interrupts will
use hrfid to return. This is important for the next patch.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210617155116.2167984-4-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 65 |
1 files changed, 47 insertions, 18 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 03727308d8cc..03a45a88b4b8 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -635,51 +635,57 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) * touched, no exit work created, then this can be used. */ .balign IFETCH_ALIGN_BYTES - .globl fast_interrupt_return -fast_interrupt_return: -_ASM_NOKPROBE_SYMBOL(fast_interrupt_return) + .globl fast_interrupt_return_srr +fast_interrupt_return_srr: +_ASM_NOKPROBE_SYMBOL(fast_interrupt_return_srr) kuap_check_amr r3, r4 ld r5,_MSR(r1) andi. r0,r5,MSR_PR #ifdef CONFIG_PPC_BOOK3S - bne .Lfast_user_interrupt_return_amr + bne .Lfast_user_interrupt_return_amr_srr kuap_kernel_restore r3, r4 andi. r0,r5,MSR_RI li r3,0 /* 0 return value, no EMULATE_STACK_STORE */ - bne+ .Lfast_kernel_interrupt_return + bne+ .Lfast_kernel_interrupt_return_srr addi r3,r1,STACK_FRAME_OVERHEAD bl unrecoverable_exception b . /* should not get here */ #else - bne .Lfast_user_interrupt_return - b .Lfast_kernel_interrupt_return + bne .Lfast_user_interrupt_return_srr + b .Lfast_kernel_interrupt_return_srr #endif +.macro interrupt_return_macro srr .balign IFETCH_ALIGN_BYTES - .globl interrupt_return -interrupt_return: -_ASM_NOKPROBE_SYMBOL(interrupt_return) + .globl interrupt_return_\srr +interrupt_return_\srr\(): +_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()) ld r4,_MSR(r1) andi. r0,r4,MSR_PR - beq .Lkernel_interrupt_return + beq .Lkernel_interrupt_return_\srr addi r3,r1,STACK_FRAME_OVERHEAD bl interrupt_exit_user_prepare cmpdi r3,0 - bne- .Lrestore_nvgprs + bne- .Lrestore_nvgprs_\srr #ifdef CONFIG_PPC_BOOK3S -.Lfast_user_interrupt_return_amr: +.Lfast_user_interrupt_return_amr_\srr\(): kuap_user_restore r3, r4 #endif -.Lfast_user_interrupt_return: +.Lfast_user_interrupt_return_\srr\(): ld r11,_NIP(r1) ld r12,_MSR(r1) BEGIN_FTR_SECTION ld r10,_PPR(r1) mtspr SPRN_PPR,r10 END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) + .ifc \srr,srr mtspr SPRN_SRR0,r11 mtspr SPRN_SRR1,r12 + .else + mtspr SPRN_HSRR0,r11 + mtspr SPRN_HSRR1,r12 + .endif BEGIN_FTR_SECTION stdcx. r0,0,r1 /* to clear the reservation */ @@ -706,24 +712,33 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) REST_GPR(6, r1) REST_GPR(0, r1) REST_GPR(1, r1) + .ifc \srr,srr RFI_TO_USER + .else + HRFI_TO_USER + .endif b . /* prevent speculative execution */ -.Lrestore_nvgprs: +.Lrestore_nvgprs_\srr\(): REST_NVGPRS(r1) - b .Lfast_user_interrupt_return + b .Lfast_user_interrupt_return_\srr .balign IFETCH_ALIGN_BYTES -.Lkernel_interrupt_return: +.Lkernel_interrupt_return_\srr\(): addi r3,r1,STACK_FRAME_OVERHEAD bl interrupt_exit_kernel_prepare -.Lfast_kernel_interrupt_return: +.Lfast_kernel_interrupt_return_\srr\(): cmpdi cr1,r3,0 ld r11,_NIP(r1) ld r12,_MSR(r1) + .ifc \srr,srr mtspr SPRN_SRR0,r11 mtspr SPRN_SRR1,r12 + .else + mtspr SPRN_HSRR0,r11 + mtspr SPRN_HSRR1,r12 + .endif BEGIN_FTR_SECTION stdcx. r0,0,r1 /* to clear the reservation */ @@ -757,7 +772,11 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) REST_GPR(6, r1) REST_GPR(0, r1) REST_GPR(1, r1) + .ifc \srr,srr RFI_TO_KERNEL + .else + HRFI_TO_KERNEL + .endif b . /* prevent speculative execution */ 1: /* @@ -777,8 +796,18 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) std r9,0(r1) /* perform store component of stdu */ ld r9,PACA_EXGEN+0(r13) + .ifc \srr,srr RFI_TO_KERNEL + .else + HRFI_TO_KERNEL + .endif b . /* prevent speculative execution */ +.endm + +interrupt_return_macro srr +#ifdef CONFIG_PPC_BOOK3S +interrupt_return_macro hsrr +#endif #ifdef CONFIG_PPC_RTAS /* |