diff options
Diffstat (limited to 'arch/tile/lib/usercopy_64.S')
| -rw-r--r-- | arch/tile/lib/usercopy_64.S | 85 |
1 files changed, 12 insertions, 73 deletions
diff --git a/arch/tile/lib/usercopy_64.S b/arch/tile/lib/usercopy_64.S index 2ff44f87b78..b3b31a3306f 100644 --- a/arch/tile/lib/usercopy_64.S +++ b/arch/tile/lib/usercopy_64.S @@ -19,55 +19,6 @@ /* Access user memory, but use MMU to avoid propagating kernel exceptions. */ - .pushsection .fixup,"ax" - -get_user_fault: - { movei r1, -EFAULT; move r0, zero } - jrp lr - ENDPROC(get_user_fault) - -put_user_fault: - { movei r0, -EFAULT; jrp lr } - ENDPROC(put_user_fault) - - .popsection - -/* - * __get_user_N functions take a pointer in r0, and return 0 in r1 - * on success, with the value in r0; or else -EFAULT in r1. - */ -#define __get_user_N(bytes, LOAD) \ - STD_ENTRY(__get_user_##bytes); \ -1: { LOAD r0, r0; move r1, zero }; \ - jrp lr; \ - STD_ENDPROC(__get_user_##bytes); \ - .pushsection __ex_table,"a"; \ - .quad 1b, get_user_fault; \ - .popsection - -__get_user_N(1, ld1u) -__get_user_N(2, ld2u) -__get_user_N(4, ld4u) -__get_user_N(8, ld) - -/* - * __put_user_N functions take a value in r0 and a pointer in r1, - * and return 0 in r0 on success or -EFAULT on failure. - */ -#define __put_user_N(bytes, STORE) \ - STD_ENTRY(__put_user_##bytes); \ -1: { STORE r1, r0; move r0, zero }; \ - jrp lr; \ - STD_ENDPROC(__put_user_##bytes); \ - .pushsection __ex_table,"a"; \ - .quad 1b, put_user_fault; \ - .popsection - -__put_user_N(1, st1) -__put_user_N(2, st2) -__put_user_N(4, st4) -__put_user_N(8, st) - /* * strnlen_user_asm takes the pointer in r0, and the length bound in r1. * It returns the length, including the terminating NUL, or zero on exception. @@ -85,6 +36,7 @@ strnlen_user_fault: { move r0, zero; jrp lr } ENDPROC(strnlen_user_fault) .section __ex_table,"a" + .align 8 .quad 1b, strnlen_user_fault .popsection @@ -96,18 +48,20 @@ strnlen_user_fault: */ STD_ENTRY(strncpy_from_user_asm) { beqz r2, 2f; move r3, r0 } -1: { ld1u r4, r1; addi r1, r1, 1; addi r2, r2, -1 } +1: { ld1u r4, r1; addi r1, r1, 1; addi r2, r2, -1 } { st1 r0, r4; addi r0, r0, 1 } - beqz r2, 2f - bnezt r4, 1b - addi r0, r0, -1 /* don't count the trailing NUL */ -2: { sub r0, r0, r3; jrp lr } + beqz r4, 2f + bnezt r2, 1b + { sub r0, r0, r3; jrp lr } +2: addi r0, r0, -1 /* don't count the trailing NUL */ + { sub r0, r0, r3; jrp lr } STD_ENDPROC(strncpy_from_user_asm) .pushsection .fixup,"ax" strncpy_from_user_fault: { movei r0, -EFAULT; jrp lr } ENDPROC(strncpy_from_user_fault) .section __ex_table,"a" + .align 8 .quad 1b, strncpy_from_user_fault .popsection @@ -126,6 +80,7 @@ STD_ENTRY(clear_user_asm) bnezt r1, 1b 2: { move r0, r1; jrp lr } .pushsection __ex_table,"a" + .align 8 .quad 1b, 2b .popsection @@ -135,6 +90,7 @@ STD_ENTRY(clear_user_asm) 2: { move r0, r1; jrp lr } STD_ENDPROC(clear_user_asm) .pushsection __ex_table,"a" + .align 8 .quad 1b, 2b .popsection @@ -154,25 +110,7 @@ STD_ENTRY(flush_user_asm) 2: { move r0, r1; jrp lr } STD_ENDPROC(flush_user_asm) .pushsection __ex_table,"a" - .quad 1b, 2b - .popsection - -/* - * inv_user_asm takes the user target address in r0 and the - * number of bytes to invalidate in r1. - * It returns the number of not inv'able bytes (hopefully zero) in r0. - */ -STD_ENTRY(inv_user_asm) - beqz r1, 2f - { movei r2, L2_CACHE_BYTES; add r1, r0, r1 } - { sub r2, zero, r2; addi r1, r1, L2_CACHE_BYTES-1 } - { and r0, r0, r2; and r1, r1, r2 } - { sub r1, r1, r0 } -1: { inv r0; addi r1, r1, -CHIP_INV_STRIDE() } - { addi r0, r0, CHIP_INV_STRIDE(); bnezt r1, 1b } -2: { move r0, r1; jrp lr } - STD_ENDPROC(inv_user_asm) - .pushsection __ex_table,"a" + .align 8 .quad 1b, 2b .popsection @@ -192,5 +130,6 @@ STD_ENTRY(finv_user_asm) 2: { move r0, r1; jrp lr } STD_ENDPROC(finv_user_asm) .pushsection __ex_table,"a" + .align 8 .quad 1b, 2b .popsection |