From f1fe5252018075e18d7f0c0e23ee173546420361 Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Mon, 1 May 2017 22:01:09 +1000 Subject: [PATCH] powerpc/64s: Fix FIXUP_ENDIAN non-maskable interrupt reentrancy FIXUP_ENDIAN uses SRR[01] with MSR_RI=1, which gets corrupted if there is an interleaving system reset or machine check interrupt. Set MSR_RI=0 before setting SRRs. The rfid will restore MSR. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman --- arch/powerpc/boot/ppc_asm.h | 12 +++++++----- arch/powerpc/include/asm/ppc_asm.h | 11 +++++++---- 2 files changed, 14 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/boot/ppc_asm.h b/arch/powerpc/boot/ppc_asm.h index b03373d8b386..68e388ee94fe 100644 --- a/arch/powerpc/boot/ppc_asm.h +++ b/arch/powerpc/boot/ppc_asm.h @@ -67,13 +67,15 @@ #define MSR_LE 0x0000000000000001 #define FIXUP_ENDIAN \ - tdi 0, 0, 0x48; /* Reverse endian of b . + 8 */ \ - b $+36; /* Skip trampoline if endian is good */ \ - .long 0x05009f42; /* bcl 20,31,$+4 */ \ - .long 0xa602487d; /* mflr r10 */ \ - .long 0x1c004a39; /* addi r10,r10,28 */ \ + tdi 0,0,0x48; /* Reverse endian of b . + 8 */ \ + b $+44; /* Skip trampoline if endian is good */ \ .long 0xa600607d; /* mfmsr r11 */ \ .long 0x01006b69; /* xori r11,r11,1 */ \ + .long 0x00004039; /* li r10,0 */ \ + .long 0x6401417d; /* mtmsrd r10,1 */ \ + .long 0x05009f42; /* bcl 20,31,$+4 */ \ + .long 0xa602487d; /* mflr r10 */ \ + .long 0x14004a39; /* addi r10,r10,20 */ \ .long 0xa6035a7d; /* mtsrr0 r10 */ \ .long 0xa6037b7d; /* mtsrr1 r11 */ \ .long 0x2400004c /* rfid */ diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h index 359c44341761..6baeeb9acd0d 100644 --- a/arch/powerpc/include/asm/ppc_asm.h +++ b/arch/powerpc/include/asm/ppc_asm.h @@ -770,15 +770,18 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601) #else #define FIXUP_ENDIAN \ tdi 0,0,0x48; /* Reverse endian of b . + 8 */ \ - b $+36; /* Skip trampoline if endian is good */ \ - .long 0x05009f42; /* bcl 20,31,$+4 */ \ - .long 0xa602487d; /* mflr r10 */ \ - .long 0x1c004a39; /* addi r10,r10,28 */ \ + b $+44; /* Skip trampoline if endian is good */ \ .long 0xa600607d; /* mfmsr r11 */ \ .long 0x01006b69; /* xori r11,r11,1 */ \ + .long 0x00004039; /* li r10,0 */ \ + .long 0x6401417d; /* mtmsrd r10,1 */ \ + .long 0x05009f42; /* bcl 20,31,$+4 */ \ + .long 0xa602487d; /* mflr r10 */ \ + .long 0x14004a39; /* addi r10,r10,20 */ \ .long 0xa6035a7d; /* mtsrr0 r10 */ \ .long 0xa6037b7d; /* mtsrr1 r11 */ \ .long 0x2400004c /* rfid */ + #endif /* !CONFIG_PPC_BOOK3E */ #endif /* __ASSEMBLY__ */ -- 2.20.1