diff options
Diffstat (limited to 'arch/loongarch/lib/copy_user.S')
| -rw-r--r-- | arch/loongarch/lib/copy_user.S | 251 |
1 files changed, 201 insertions, 50 deletions
diff --git a/arch/loongarch/lib/copy_user.S b/arch/loongarch/lib/copy_user.S index 55ac6020a1ad..b21f6d5d38f5 100644 --- a/arch/loongarch/lib/copy_user.S +++ b/arch/loongarch/lib/copy_user.S @@ -13,7 +13,14 @@ .irp to, 0, 1, 2, 3, 4, 5, 6, 7 .L_fixup_handle_\to\(): - addi.d a0, a2, (\to) * (-8) + sub.d a0, a2, a0 + addi.d a0, a0, (\to) * (-8) + jr ra +.endr + +.irp to, 0, 2, 4 +.L_fixup_handle_s\to\(): + addi.d a0, a2, -\to jr ra .endr @@ -47,8 +54,8 @@ SYM_FUNC_START(__copy_user_generic) 3: move a0, a2 jr ra - _asm_extable 1b, .L_fixup_handle_0 - _asm_extable 2b, .L_fixup_handle_0 + _asm_extable 1b, .L_fixup_handle_s0 + _asm_extable 2b, .L_fixup_handle_s0 SYM_FUNC_END(__copy_user_generic) /* @@ -59,65 +66,209 @@ SYM_FUNC_END(__copy_user_generic) * a2: n */ SYM_FUNC_START(__copy_user_fast) - beqz a2, 19f + sltui t0, a2, 9 + bnez t0, .Lsmall - ori a3, zero, 64 - blt a2, a3, 17f + add.d a3, a1, a2 + add.d a2, a0, a2 +0: ld.d t0, a1, 0 +1: st.d t0, a0, 0 - /* copy 64 bytes at a time */ -1: ld.d t0, a1, 0 -2: ld.d t1, a1, 8 -3: ld.d t2, a1, 16 -4: ld.d t3, a1, 24 -5: ld.d t4, a1, 32 -6: ld.d t5, a1, 40 -7: ld.d t6, a1, 48 -8: ld.d t7, a1, 56 -9: st.d t0, a0, 0 -10: st.d t1, a0, 8 -11: st.d t2, a0, 16 -12: st.d t3, a0, 24 -13: st.d t4, a0, 32 -14: st.d t5, a0, 40 -15: st.d t6, a0, 48 -16: st.d t7, a0, 56 + /* align up destination address */ + andi t1, a0, 7 + sub.d t0, zero, t1 + addi.d t0, t0, 8 + add.d a1, a1, t0 + add.d a0, a0, t0 - addi.d a0, a0, 64 - addi.d a1, a1, 64 - addi.d a2, a2, -64 - bge a2, a3, 1b + addi.d a4, a3, -64 + bgeu a1, a4, .Llt64 - beqz a2, 19f + /* copy 64 bytes at a time */ +.Lloop64: +2: ld.d t0, a1, 0 +3: ld.d t1, a1, 8 +4: ld.d t2, a1, 16 +5: ld.d t3, a1, 24 +6: ld.d t4, a1, 32 +7: ld.d t5, a1, 40 +8: ld.d t6, a1, 48 +9: ld.d t7, a1, 56 + addi.d a1, a1, 64 +10: st.d t0, a0, 0 +11: st.d t1, a0, 8 +12: st.d t2, a0, 16 +13: st.d t3, a0, 24 +14: st.d t4, a0, 32 +15: st.d t5, a0, 40 +16: st.d t6, a0, 48 +17: st.d t7, a0, 56 + addi.d a0, a0, 64 + bltu a1, a4, .Lloop64 /* copy the remaining bytes */ -17: ld.b t0, a1, 0 -18: st.b t0, a0, 0 - addi.d a0, a0, 1 - addi.d a1, a1, 1 - addi.d a2, a2, -1 - bgt a2, zero, 17b +.Llt64: + addi.d a4, a3, -32 + bgeu a1, a4, .Llt32 +18: ld.d t0, a1, 0 +19: ld.d t1, a1, 8 +20: ld.d t2, a1, 16 +21: ld.d t3, a1, 24 + addi.d a1, a1, 32 +22: st.d t0, a0, 0 +23: st.d t1, a0, 8 +24: st.d t2, a0, 16 +25: st.d t3, a0, 24 + addi.d a0, a0, 32 + +.Llt32: + addi.d a4, a3, -16 + bgeu a1, a4, .Llt16 +26: ld.d t0, a1, 0 +27: ld.d t1, a1, 8 + addi.d a1, a1, 16 +28: st.d t0, a0, 0 +29: st.d t1, a0, 8 + addi.d a0, a0, 16 + +.Llt16: + addi.d a4, a3, -8 + bgeu a1, a4, .Llt8 +30: ld.d t0, a1, 0 +31: st.d t0, a0, 0 + +.Llt8: +32: ld.d t0, a3, -8 +33: st.d t0, a2, -8 /* return */ -19: move a0, a2 + move a0, zero + jr ra + + .align 5 +.Lsmall: + pcaddi t0, 8 + slli.d a3, a2, 5 + add.d t0, t0, a3 + jr t0 + + .align 5 + move a0, zero + jr ra + + .align 5 +34: ld.b t0, a1, 0 +35: st.b t0, a0, 0 + move a0, zero + jr ra + + .align 5 +36: ld.h t0, a1, 0 +37: st.h t0, a0, 0 + move a0, zero + jr ra + + .align 5 +38: ld.h t0, a1, 0 +39: ld.b t1, a1, 2 +40: st.h t0, a0, 0 +41: st.b t1, a0, 2 + move a0, zero + jr ra + + .align 5 +42: ld.w t0, a1, 0 +43: st.w t0, a0, 0 + move a0, zero + jr ra + + .align 5 +44: ld.w t0, a1, 0 +45: ld.b t1, a1, 4 +46: st.w t0, a0, 0 +47: st.b t1, a0, 4 + move a0, zero + jr ra + + .align 5 +48: ld.w t0, a1, 0 +49: ld.h t1, a1, 4 +50: st.w t0, a0, 0 +51: st.h t1, a0, 4 + move a0, zero + jr ra + + .align 5 +52: ld.w t0, a1, 0 +53: ld.w t1, a1, 3 +54: st.w t0, a0, 0 +55: st.w t1, a0, 3 + move a0, zero + jr ra + + .align 5 +56: ld.d t0, a1, 0 +57: st.d t0, a0, 0 + move a0, zero jr ra /* fixup and ex_table */ + _asm_extable 0b, .L_fixup_handle_0 _asm_extable 1b, .L_fixup_handle_0 - _asm_extable 2b, .L_fixup_handle_1 - _asm_extable 3b, .L_fixup_handle_2 - _asm_extable 4b, .L_fixup_handle_3 - _asm_extable 5b, .L_fixup_handle_4 - _asm_extable 6b, .L_fixup_handle_5 - _asm_extable 7b, .L_fixup_handle_6 - _asm_extable 8b, .L_fixup_handle_7 + _asm_extable 2b, .L_fixup_handle_0 + _asm_extable 3b, .L_fixup_handle_0 + _asm_extable 4b, .L_fixup_handle_0 + _asm_extable 5b, .L_fixup_handle_0 + _asm_extable 6b, .L_fixup_handle_0 + _asm_extable 7b, .L_fixup_handle_0 + _asm_extable 8b, .L_fixup_handle_0 _asm_extable 9b, .L_fixup_handle_0 - _asm_extable 10b, .L_fixup_handle_1 - _asm_extable 11b, .L_fixup_handle_2 - _asm_extable 12b, .L_fixup_handle_3 - _asm_extable 13b, .L_fixup_handle_4 - _asm_extable 14b, .L_fixup_handle_5 - _asm_extable 15b, .L_fixup_handle_6 - _asm_extable 16b, .L_fixup_handle_7 - _asm_extable 17b, .L_fixup_handle_0 + _asm_extable 10b, .L_fixup_handle_0 + _asm_extable 11b, .L_fixup_handle_1 + _asm_extable 12b, .L_fixup_handle_2 + _asm_extable 13b, .L_fixup_handle_3 + _asm_extable 14b, .L_fixup_handle_4 + _asm_extable 15b, .L_fixup_handle_5 + _asm_extable 16b, .L_fixup_handle_6 + _asm_extable 17b, .L_fixup_handle_7 _asm_extable 18b, .L_fixup_handle_0 + _asm_extable 19b, .L_fixup_handle_0 + _asm_extable 20b, .L_fixup_handle_0 + _asm_extable 21b, .L_fixup_handle_0 + _asm_extable 22b, .L_fixup_handle_0 + _asm_extable 23b, .L_fixup_handle_1 + _asm_extable 24b, .L_fixup_handle_2 + _asm_extable 25b, .L_fixup_handle_3 + _asm_extable 26b, .L_fixup_handle_0 + _asm_extable 27b, .L_fixup_handle_0 + _asm_extable 28b, .L_fixup_handle_0 + _asm_extable 29b, .L_fixup_handle_1 + _asm_extable 30b, .L_fixup_handle_0 + _asm_extable 31b, .L_fixup_handle_0 + _asm_extable 32b, .L_fixup_handle_0 + _asm_extable 33b, .L_fixup_handle_1 + _asm_extable 34b, .L_fixup_handle_s0 + _asm_extable 35b, .L_fixup_handle_s0 + _asm_extable 36b, .L_fixup_handle_s0 + _asm_extable 37b, .L_fixup_handle_s0 + _asm_extable 38b, .L_fixup_handle_s0 + _asm_extable 39b, .L_fixup_handle_s0 + _asm_extable 40b, .L_fixup_handle_s0 + _asm_extable 41b, .L_fixup_handle_s2 + _asm_extable 42b, .L_fixup_handle_s0 + _asm_extable 43b, .L_fixup_handle_s0 + _asm_extable 44b, .L_fixup_handle_s0 + _asm_extable 45b, .L_fixup_handle_s0 + _asm_extable 46b, .L_fixup_handle_s0 + _asm_extable 47b, .L_fixup_handle_s4 + _asm_extable 48b, .L_fixup_handle_s0 + _asm_extable 49b, .L_fixup_handle_s0 + _asm_extable 50b, .L_fixup_handle_s0 + _asm_extable 51b, .L_fixup_handle_s4 + _asm_extable 52b, .L_fixup_handle_s0 + _asm_extable 53b, .L_fixup_handle_s0 + _asm_extable 54b, .L_fixup_handle_s0 + _asm_extable 55b, .L_fixup_handle_s4 + _asm_extable 56b, .L_fixup_handle_s0 + _asm_extable 57b, .L_fixup_handle_s0 SYM_FUNC_END(__copy_user_fast) |