From: Christophe Leroy christophe.leroy@csgroup.eu
[ Upstream commit f5007dbf4da729baa850b33a64dc3cc53757bdf8 ]
Use bcl 20,31,+4 instead of bl in order to preserve link stack.
See commit c974809a26a1 ("powerpc/vdso: Avoid link stack corruption in __get_datapage()") for details.
Signed-off-by: Christophe Leroy christophe.leroy@csgroup.eu Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/e9fbc285eceb720e6c0e032ef47fe8b05f669b48.162979175... Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/include/asm/ppc_asm.h | 2 +- arch/powerpc/kernel/exceptions-64e.S | 6 +++--- arch/powerpc/kernel/fsl_booke_entry_mapping.S | 8 ++++---- arch/powerpc/kernel/head_44x.S | 6 +++--- arch/powerpc/kernel/head_fsl_booke.S | 6 +++--- arch/powerpc/mm/nohash/tlb_low.S | 4 ++-- 6 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h index 511786f0e40d..f42ba0b86a3a 100644 --- a/arch/powerpc/include/asm/ppc_asm.h +++ b/arch/powerpc/include/asm/ppc_asm.h @@ -306,7 +306,7 @@ GLUE(.,name):
/* Be careful, this will clobber the lr register. */ #define LOAD_REG_ADDR_PIC(reg, name) \ - bl 0f; \ + bcl 20,31,$+4; \ 0: mflr reg; \ addis reg,reg,(name - 0b)@ha; \ addi reg,reg,(name - 0b)@l; diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index f579ce46eef2..1bb505eeb154 100644 --- a/arch/powerpc/kernel/exceptions-64e.S +++ b/arch/powerpc/kernel/exceptions-64e.S @@ -1443,7 +1443,7 @@ found_iprot: * r3 = MAS0_TLBSEL (for the iprot array) * r4 = SPRN_TLBnCFG */ - bl invstr /* Find our address */ + bcl 20,31,$+4 /* Find our address */ invstr: mflr r6 /* Make it accessible */ mfmsr r7 rlwinm r5,r7,27,31,31 /* extract MSR[IS] */ @@ -1512,7 +1512,7 @@ skpinv: addi r6,r6,1 /* Increment */ mfmsr r6 xori r6,r6,MSR_IS mtspr SPRN_SRR1,r6 - bl 1f /* Find our address */ + bcl 20,31,$+4 /* Find our address */ 1: mflr r6 addi r6,r6,(2f - 1b) mtspr SPRN_SRR0,r6 @@ -1572,7 +1572,7 @@ skpinv: addi r6,r6,1 /* Increment */ * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping */ /* Now we branch the new virtual address mapped by this entry */ - bl 1f /* Find our address */ + bcl 20,31,$+4 /* Find our address */ 1: mflr r6 addi r6,r6,(2f - 1b) tovirt(r6,r6) diff --git a/arch/powerpc/kernel/fsl_booke_entry_mapping.S b/arch/powerpc/kernel/fsl_booke_entry_mapping.S index 8bccce6544b5..dedc17fac8f8 100644 --- a/arch/powerpc/kernel/fsl_booke_entry_mapping.S +++ b/arch/powerpc/kernel/fsl_booke_entry_mapping.S @@ -1,7 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0 */
/* 1. Find the index of the entry we're executing in */ - bl invstr /* Find our address */ + bcl 20,31,$+4 /* Find our address */ invstr: mflr r6 /* Make it accessible */ mfmsr r7 rlwinm r4,r7,27,31,31 /* extract MSR[IS] */ @@ -85,7 +85,7 @@ skpinv: addi r6,r6,1 /* Increment */ addi r6,r6,10 slw r6,r8,r6 /* convert to mask */
- bl 1f /* Find our address */ + bcl 20,31,$+4 /* Find our address */ 1: mflr r7
mfspr r8,SPRN_MAS3 @@ -117,7 +117,7 @@ skpinv: addi r6,r6,1 /* Increment */
xori r6,r4,1 slwi r6,r6,5 /* setup new context with other address space */ - bl 1f /* Find our address */ + bcl 20,31,$+4 /* Find our address */ 1: mflr r9 rlwimi r7,r9,0,20,31 addi r7,r7,(2f - 1b) @@ -207,7 +207,7 @@ next_tlb_setup:
lis r7,MSR_KERNEL@h ori r7,r7,MSR_KERNEL@l - bl 1f /* Find our address */ + bcl 20,31,$+4 /* Find our address */ 1: mflr r9 rlwimi r6,r9,0,20,31 addi r6,r6,(2f - 1b) diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S index 8e36718f3167..b178b372e66e 100644 --- a/arch/powerpc/kernel/head_44x.S +++ b/arch/powerpc/kernel/head_44x.S @@ -70,7 +70,7 @@ _ENTRY(_start); * address. * r21 will be loaded with the physical runtime address of _stext */ - bl 0f /* Get our runtime address */ + bcl 20,31,$+4 /* Get our runtime address */ 0: mflr r21 /* Make it accessible */ addis r21,r21,(_stext - 0b)@ha addi r21,r21,(_stext - 0b)@l /* Get our current runtime base */ @@ -861,7 +861,7 @@ _GLOBAL(init_cpu_state) wmmucr: mtspr SPRN_MMUCR,r3 /* Put MMUCR */ sync
- bl invstr /* Find our address */ + bcl 20,31,$+4 /* Find our address */ invstr: mflr r5 /* Make it accessible */ tlbsx r23,0,r5 /* Find entry we are in */ li r4,0 /* Start at TLB entry 0 */ @@ -1053,7 +1053,7 @@ head_start_47x: sync
/* Find the entry we are running from */ - bl 1f + bcl 20,31,$+4 1: mflr r23 tlbsx r23,0,r23 tlbre r24,r23,0 diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S index 586a6ac501e9..daf4a72bb08f 100644 --- a/arch/powerpc/kernel/head_fsl_booke.S +++ b/arch/powerpc/kernel/head_fsl_booke.S @@ -79,7 +79,7 @@ _ENTRY(_start); mr r23,r3 mr r25,r4
- bl 0f + bcl 20,31,$+4 0: mflr r8 addis r3,r8,(is_second_reloc - 0b)@ha lwz r19,(is_second_reloc - 0b)@l(r3) @@ -1195,7 +1195,7 @@ _GLOBAL(switch_to_as1) bne 1b
/* Get the tlb entry used by the current running code */ - bl 0f + bcl 20,31,$+4 0: mflr r4 tlbsx 0,r4
@@ -1229,7 +1229,7 @@ _GLOBAL(switch_to_as1) _GLOBAL(restore_to_as0) mflr r0
- bl 0f + bcl 20,31,$+4 0: mflr r9 addi r9,r9,1f - 0b
diff --git a/arch/powerpc/mm/nohash/tlb_low.S b/arch/powerpc/mm/nohash/tlb_low.S index eaeee402f96e..f849f26bfbfb 100644 --- a/arch/powerpc/mm/nohash/tlb_low.S +++ b/arch/powerpc/mm/nohash/tlb_low.S @@ -214,7 +214,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_476_DD2) * Touch enough instruction cache lines to ensure cache hits */ 1: mflr r9 - bl 2f + bcl 20,31,$+4 2: mflr r6 li r7,32 PPC_ICBT(0,R6,R7) /* touch next cache line */ @@ -442,7 +442,7 @@ _GLOBAL(loadcam_multi) * Set up temporary TLB entry that is the same as what we're * running from, but in AS=1. */ - bl 1f + bcl 20,31,$+4 1: mflr r6 tlbsx 0,r8 mfspr r6,SPRN_MAS1