MIPS: Use uasm_i_ds{r,l}l_safe() instead of uasm_i_ds{r,l}l() in tlbex.c

This makes the code somewhat cleaner while reducing the risk of shift
amount overflows when various page table related options are changed.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1154/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 14 insertions, 16 deletions

diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index d1f68aadbc4c..61374b2c930d 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -408,7 +408,7 @@ static __cpuinit __maybe_unused void build_convert_pte_to_entrylo(u32 **p,
                 UASM_i_ROTR(p, reg, reg, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
         } else {
 #ifdef CONFIG_64BIT_PHYS_ADDR
-                uasm_i_dsrl(p, reg, reg, ilog2(_PAGE_GLOBAL));
+                uasm_i_dsrl_safe(p, reg, reg, ilog2(_PAGE_GLOBAL));
 #else
                 UASM_i_SRL(p, reg, reg, ilog2(_PAGE_GLOBAL));
 #endif
@@ -549,14 +549,14 @@ build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
          * SMTC uses TCBind value as "CPU" index
          */
         uasm_i_mfc0(p, ptr, C0_TCBIND);
-        uasm_i_dsrl(p, ptr, ptr, 19);
+        uasm_i_dsrl_safe(p, ptr, ptr, 19);
 # else
         /*
          * 64 bit SMP running in XKPHYS has smp_processor_id() << 3
          * stored in CONTEXT.
          */
         uasm_i_dmfc0(p, ptr, C0_CONTEXT);
-        uasm_i_dsrl(p, ptr, ptr, 23);
+        uasm_i_dsrl_safe(p, ptr, ptr, 23);
 # endif
         UASM_i_LA_mostly(p, tmp, pgdc);
         uasm_i_daddu(p, ptr, ptr, tmp);
@@ -569,17 +569,15 @@ build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
 
         uasm_l_vmalloc_done(l, *p);
 
-        if (PGDIR_SHIFT - 3 < 32)               /* get pgd offset in bytes */
-                uasm_i_dsrl(p, tmp, tmp, PGDIR_SHIFT-3);
-        else
-                uasm_i_dsrl32(p, tmp, tmp, PGDIR_SHIFT - 3 - 32);
+        /* get pgd offset in bytes */
+        uasm_i_dsrl_safe(p, tmp, tmp, PGDIR_SHIFT - 3);
 
         uasm_i_andi(p, tmp, tmp, (PTRS_PER_PGD - 1)<<3);
         uasm_i_daddu(p, ptr, ptr, tmp); /* add in pgd offset */
 #ifndef __PAGETABLE_PMD_FOLDED
         uasm_i_dmfc0(p, tmp, C0_BADVADDR); /* get faulting address */
         uasm_i_ld(p, ptr, 0, ptr); /* get pmd pointer */
-        uasm_i_dsrl(p, tmp, tmp, PMD_SHIFT-3); /* get pmd offset in bytes */
+        uasm_i_dsrl_safe(p, tmp, tmp, PMD_SHIFT-3); /* get pmd offset in bytes */
         uasm_i_andi(p, tmp, tmp, (PTRS_PER_PMD - 1)<<3);
         uasm_i_daddu(p, ptr, ptr, tmp); /* add in pmd offset */
 #endif
@@ -720,9 +718,9 @@ static void __cpuinit build_update_entries(u32 **p, unsigned int tmp,
                         UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
                         UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
                 } else {
-                        uasm_i_dsrl(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */
+                        uasm_i_dsrl_safe(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */
                         UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
-                        uasm_i_dsrl(p, ptep, ptep, ilog2(_PAGE_GLOBAL)); /* convert to entrylo1 */
+                        uasm_i_dsrl_safe(p, ptep, ptep, ilog2(_PAGE_GLOBAL)); /* convert to entrylo1 */
                 }
                 UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */
         } else {
@@ -793,9 +791,9 @@ static void __cpuinit build_r4000_tlb_refill_handler(void)
                 uasm_i_dmfc0(&p, K0, C0_BADVADDR);
                 uasm_i_dmfc0(&p, K1, C0_ENTRYHI);
                 uasm_i_xor(&p, K0, K0, K1);
-                uasm_i_dsrl32(&p, K1, K0, 62 - 32);
-                uasm_i_dsrl(&p, K0, K0, 12 + 1);
-                uasm_i_dsll32(&p, K0, K0, 64 + 12 + 1 - segbits - 32);
+                uasm_i_dsrl_safe(&p, K1, K0, 62);
+                uasm_i_dsrl_safe(&p, K0, K0, 12 + 1);
+                uasm_i_dsll_safe(&p, K0, K0, 64 + 12 + 1 - segbits);
                 uasm_i_or(&p, K0, K0, K1);
                 uasm_il_bnez(&p, &r, K0, label_leave);
                 /* No need for uasm_i_nop */
@@ -1322,9 +1320,9 @@ static void __cpuinit build_r4000_tlb_load_handler(void)
                 uasm_i_dmfc0(&p, K0, C0_BADVADDR);
                 uasm_i_dmfc0(&p, K1, C0_ENTRYHI);
                 uasm_i_xor(&p, K0, K0, K1);
-                uasm_i_dsrl32(&p, K1, K0, 62 - 32);
-                uasm_i_dsrl(&p, K0, K0, 12 + 1);
-                uasm_i_dsll32(&p, K0, K0, 64 + 12 + 1 - segbits - 32);
+                uasm_i_dsrl_safe(&p, K1, K0, 62);
+                uasm_i_dsrl_safe(&p, K0, K0, 12 + 1);
+                uasm_i_dsll_safe(&p, K0, K0, 64 + 12 + 1 - segbits);
                 uasm_i_or(&p, K0, K0, K1);
                 uasm_il_bnez(&p, &r, K0, label_leave);
                 /* No need for uasm_i_nop */