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Commit 3be6022c authored by David Daney's avatar David Daney Committed by Ralf Baechle
Browse files

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: default avatarDavid Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1154/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 26b9e547

arch/mips/mm/tlbex.c

+14 −16
Original line number Diff line number Diff line
@@ -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 */