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https://github.com/RIOT-OS/RIOT.git
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97 lines
1.6 KiB
ArmAsm
97 lines
1.6 KiB
ArmAsm
@-----------------------------------------------------------@
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@ Fast Block Copy (declared in diskio.h)
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@-----------------------------------------------------------@
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.global Copy_un2al
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.arm
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Copy_un2al:
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STMFD SP!, {R4-R8}
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ANDS IP, R1, #3
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BEQ lb_align
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BIC R1, #3
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MOV IP, IP, LSL #3
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RSB R8, IP, #32
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LDMIA R1!, {R7}
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lb_l1: MOV R3, R7
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LDMIA R1!, {R4-R7}
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MOV R3, R3, LSR IP
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ORR R3, R3, R4, LSL R8
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MOV R4, R4, LSR IP
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ORR R4, R4, R5, LSL R8
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MOV R5, R5, LSR IP
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ORR R5, R5, R6, LSL R8
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MOV R6, R6, LSR IP
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ORR R6, R6, R7, LSL R8
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SUBS R2, R2, #16
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STMIA R0!, {R3-R6}
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BNE lb_l1
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LDMFD SP!, {R4-R8}
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BX LR
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lb_align:
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LDMIA R1!, {R3-R6}
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SUBS R2, R2, #16
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STMIA R0!, {R3-R6}
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BNE lb_align
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LDMFD SP!, {R4-R8}
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BX LR
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.global Copy_al2un
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.arm
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Copy_al2un:
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STMFD SP!, {R4-R8}
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ANDS IP, R0, #3
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BEQ sb_align
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MOV IP, IP, LSL #3
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RSB R8, IP, #32
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LDMIA R1!, {R4-R7}
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sb_p1: STRB R4, [R0], #1
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MOV R4, R4, LSR #8
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TST R0, #3
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BNE sb_p1
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ORR R4, R4, R5, LSL IP
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MOV R5, R5, LSR R8
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ORR R5, R5, R6, LSL IP
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MOV R6, R6, LSR R8
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ORR R6, R6, R7, LSL IP
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SUBS R2, R2, #16
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STMIA R0!, {R4-R6}
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sb_l1: MOV R3, R7
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LDMIA R1!, {R4-R7}
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MOV R3, R3, LSR R8
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ORR R3, R3, R4, LSL IP
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MOV R4, R4, LSR R8
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ORR R4, R4, R5, LSL IP
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MOV R5, R5, LSR R8
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ORR R5, R5, R6, LSL IP
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MOV R6, R6, LSR R8
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ORR R6, R6, R7, LSL IP
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SUBS R2, R2, #16
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STMIA R0!, {R3-R6}
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BNE sb_l1
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MOV R7, R7, LSR R8
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sb_p2: SUBS IP, IP, #8
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STRB R7, [R0], #1
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MOV R7, R7, LSR #8
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BNE sb_p2
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LDMFD SP!, {R4-R8}
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BX LR
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sb_align:
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LDMIA R1!, {R3-R6}
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SUBS R2, #16
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STMIA R0!, {R3-R6}
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BNE sb_align
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LDMFD SP!, {R4-R8}
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BX LR
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.end
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