sparc64: Fix illegal relative branches in hypervisor patched TLB cross-call code.

[ Upstream commit a236441bb69723032db94128761a469030c3fe6d ]

Just like the non-cross-call TLB flush handlers, the cross-call ones need
to avoid doing PC-relative branches outside of their code blocks.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/sparc/mm/ultra.S b/arch/sparc/mm/ultra.S
index 5128d38b1d1a6584f12204efb219029bdc165cbc..0fa2e6202c1f2d9a8eddf5084a0d30fb863b1b11 100644 (file)
--- a/arch/sparc/mm/ultra.S
+++ b/arch/sparc/mm/ultra.S
@@ -484,7 +484,7 @@ cheetah_patch_cachetlbops:
         */
        .align          32
        .globl          xcall_flush_tlb_mm
-xcall_flush_tlb_mm:    /* 21 insns */
+xcall_flush_tlb_mm:    /* 24 insns */
        mov             PRIMARY_CONTEXT, %g2
        ldxa            [%g2] ASI_DMMU, %g3
        srlx            %g3, CTX_PGSZ1_NUC_SHIFT, %g4
@@ -506,9 +506,12 @@ xcall_flush_tlb_mm:        /* 21 insns */
        nop
        nop
        nop
+       nop
+       nop
+       nop
 
        .globl          xcall_flush_tlb_page
-xcall_flush_tlb_page:  /* 17 insns */
+xcall_flush_tlb_page:  /* 20 insns */
        /* %g5=context, %g1=vaddr */
        mov             PRIMARY_CONTEXT, %g4
        ldxa            [%g4] ASI_DMMU, %g2
@@ -527,9 +530,12 @@ xcall_flush_tlb_page:      /* 17 insns */
        retry
        nop
        nop
+       nop
+       nop
+       nop
 
        .globl          xcall_flush_tlb_kernel_range
-xcall_flush_tlb_kernel_range:  /* 25 insns */
+xcall_flush_tlb_kernel_range:  /* 28 insns */
        sethi           %hi(PAGE_SIZE - 1), %g2
        or              %g2, %lo(PAGE_SIZE - 1), %g2
        andn            %g1, %g2, %g1
@@ -555,6 +561,9 @@ xcall_flush_tlb_kernel_range:       /* 25 insns */
        nop
        nop
        nop
+       nop
+       nop
+       nop
 
        /* This runs in a very controlled environment, so we do
         * not need to worry about BH races etc.
@@ -737,7 +746,7 @@ __hypervisor_tlb_xcall_error:
        ba,a,pt %xcc, rtrap
 
        .globl          __hypervisor_xcall_flush_tlb_mm
-__hypervisor_xcall_flush_tlb_mm: /* 21 insns */
+__hypervisor_xcall_flush_tlb_mm: /* 24 insns */
        /* %g5=ctx, g1,g2,g3,g4,g7=scratch, %g6=unusable */
        mov             %o0, %g2
        mov             %o1, %g3
@@ -751,7 +760,7 @@ __hypervisor_xcall_flush_tlb_mm: /* 21 insns */
        mov             HV_FAST_MMU_DEMAP_CTX, %o5
        ta              HV_FAST_TRAP
        mov             HV_FAST_MMU_DEMAP_CTX, %g6
-       brnz,pn         %o0, __hypervisor_tlb_xcall_error
+       brnz,pn         %o0, 1f
         mov            %o0, %g5
        mov             %g2, %o0
        mov             %g3, %o1
@@ -760,9 +769,12 @@ __hypervisor_xcall_flush_tlb_mm: /* 21 insns */
        mov             %g7, %o5
        membar          #Sync
        retry
+1:     sethi           %hi(__hypervisor_tlb_xcall_error), %g4
+       jmpl            %g4 + %lo(__hypervisor_tlb_xcall_error), %g0
+        nop
 
        .globl          __hypervisor_xcall_flush_tlb_page
-__hypervisor_xcall_flush_tlb_page: /* 17 insns */
+__hypervisor_xcall_flush_tlb_page: /* 20 insns */
        /* %g5=ctx, %g1=vaddr */
        mov             %o0, %g2
        mov             %o1, %g3
@@ -774,16 +786,19 @@ __hypervisor_xcall_flush_tlb_page: /* 17 insns */
        sllx            %o0, PAGE_SHIFT, %o0
        ta              HV_MMU_UNMAP_ADDR_TRAP
        mov             HV_MMU_UNMAP_ADDR_TRAP, %g6
-       brnz,a,pn       %o0, __hypervisor_tlb_xcall_error
+       brnz,a,pn       %o0, 1f
         mov            %o0, %g5
        mov             %g2, %o0
        mov             %g3, %o1
        mov             %g4, %o2
        membar          #Sync
        retry
+1:     sethi           %hi(__hypervisor_tlb_xcall_error), %g4
+       jmpl            %g4 + %lo(__hypervisor_tlb_xcall_error), %g0
+        nop
 
        .globl          __hypervisor_xcall_flush_tlb_kernel_range
-__hypervisor_xcall_flush_tlb_kernel_range: /* 25 insns */
+__hypervisor_xcall_flush_tlb_kernel_range: /* 28 insns */
        /* %g1=start, %g7=end, g2,g3,g4,g5,g6=scratch */
        sethi           %hi(PAGE_SIZE - 1), %g2
        or              %g2, %lo(PAGE_SIZE - 1), %g2
@@ -800,7 +815,7 @@ __hypervisor_xcall_flush_tlb_kernel_range: /* 25 insns */
        mov             HV_MMU_ALL, %o2 /* ARG2: flags */
        ta              HV_MMU_UNMAP_ADDR_TRAP
        mov             HV_MMU_UNMAP_ADDR_TRAP, %g6
-       brnz,pn         %o0, __hypervisor_tlb_xcall_error
+       brnz,pn         %o0, 1f
         mov            %o0, %g5
        sethi           %hi(PAGE_SIZE), %o2
        brnz,pt         %g3, 1b
@@ -810,6 +825,9 @@ __hypervisor_xcall_flush_tlb_kernel_range: /* 25 insns */
        mov             %g7, %o2
        membar          #Sync
        retry
+1:     sethi           %hi(__hypervisor_tlb_xcall_error), %g4
+       jmpl            %g4 + %lo(__hypervisor_tlb_xcall_error), %g0
+        nop
 
        /* These just get rescheduled to PIL vectors. */
        .globl          xcall_call_function
@@ -894,21 +912,21 @@ hypervisor_patch_cachetlbops:
        sethi           %hi(__hypervisor_xcall_flush_tlb_mm), %o1
        or              %o1, %lo(__hypervisor_xcall_flush_tlb_mm), %o1
        call            tlb_patch_one
-        mov            21, %o2
+        mov            24, %o2
 
        sethi           %hi(xcall_flush_tlb_page), %o0
        or              %o0, %lo(xcall_flush_tlb_page), %o0
        sethi           %hi(__hypervisor_xcall_flush_tlb_page), %o1
        or              %o1, %lo(__hypervisor_xcall_flush_tlb_page), %o1
        call            tlb_patch_one
-        mov            17, %o2
+        mov            20, %o2
 
        sethi           %hi(xcall_flush_tlb_kernel_range), %o0
        or              %o0, %lo(xcall_flush_tlb_kernel_range), %o0
        sethi           %hi(__hypervisor_xcall_flush_tlb_kernel_range), %o1
        or              %o1, %lo(__hypervisor_xcall_flush_tlb_kernel_range), %o1
        call            tlb_patch_one
-        mov            25, %o2
+        mov            28, %o2
 #endif /* CONFIG_SMP */
 
        ret