diff options
Diffstat (limited to 'target/linux/at91/image/dfboot/src/_umodsi3.S')
| -rw-r--r-- | target/linux/at91/image/dfboot/src/_umodsi3.S | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/target/linux/at91/image/dfboot/src/_umodsi3.S b/target/linux/at91/image/dfboot/src/_umodsi3.S deleted file mode 100644 index e4aebe8..0000000 --- a/target/linux/at91/image/dfboot/src/_umodsi3.S +++ /dev/null @@ -1,88 +0,0 @@ -/* # 1 "libgcc1.S" */ -@ libgcc1 routines for ARM cpu. -@ Division routines, written by Richard Earnshaw, (rearnsha@armltd.co.uk) -/* # 145 "libgcc1.S" */ -dividend .req r0 -divisor .req r1 -overdone .req r2 -curbit .req r3 -/* ip .req r12 */ -/* sp .req r13 */ -/* lr .req r14 */ -/* pc .req r15 */ - .text - .globl __umodsi3 - .type __umodsi3 ,function - .align 0 - __umodsi3 : - cmp divisor, #0 - beq Ldiv0 - mov curbit, #1 - cmp dividend, divisor - movcc pc, lr -Loop1: - @ Unless the divisor is very big, shift it up in multiples of - @ four bits, since this is the amount of unwinding in the main - @ division loop. Continue shifting until the divisor is - @ larger than the dividend. - cmp divisor, #0x10000000 - cmpcc divisor, dividend - movcc divisor, divisor, lsl #4 - movcc curbit, curbit, lsl #4 - bcc Loop1 -Lbignum: - @ For very big divisors, we must shift it a bit at a time, or - @ we will be in danger of overflowing. - cmp divisor, #0x80000000 - cmpcc divisor, dividend - movcc divisor, divisor, lsl #1 - movcc curbit, curbit, lsl #1 - bcc Lbignum -Loop3: - @ Test for possible subtractions. On the final pass, this may - @ subtract too much from the dividend, so keep track of which - @ subtractions are done, we can fix them up afterwards... - mov overdone, #0 - cmp dividend, divisor - subcs dividend, dividend, divisor - cmp dividend, divisor, lsr #1 - subcs dividend, dividend, divisor, lsr #1 - orrcs overdone, overdone, curbit, ror #1 - cmp dividend, divisor, lsr #2 - subcs dividend, dividend, divisor, lsr #2 - orrcs overdone, overdone, curbit, ror #2 - cmp dividend, divisor, lsr #3 - subcs dividend, dividend, divisor, lsr #3 - orrcs overdone, overdone, curbit, ror #3 - mov ip, curbit - cmp dividend, #0 @ Early termination? - movnes curbit, curbit, lsr #4 @ No, any more bits to do? - movne divisor, divisor, lsr #4 - bne Loop3 - @ Any subtractions that we should not have done will be recorded in - @ the top three bits of "overdone". Exactly which were not needed - @ are governed by the position of the bit, stored in ip. - @ If we terminated early, because dividend became zero, - @ then none of the below will match, since the bit in ip will not be - @ in the bottom nibble. - ands overdone, overdone, #0xe0000000 - moveq pc, lr @ No fixups needed - tst overdone, ip, ror #3 - addne dividend, dividend, divisor, lsr #3 - tst overdone, ip, ror #2 - addne dividend, dividend, divisor, lsr #2 - tst overdone, ip, ror #1 - addne dividend, dividend, divisor, lsr #1 - mov pc, lr -Ldiv0: - str lr, [sp, #-4]! - bl __div0 (PLT) - mov r0, #0 @ about as wrong as it could be - ldmia sp!, {pc} - .size __umodsi3 , . - __umodsi3 -/* # 320 "libgcc1.S" */ -/* # 421 "libgcc1.S" */ -/* # 433 "libgcc1.S" */ -/* # 456 "libgcc1.S" */ -/* # 500 "libgcc1.S" */ -/* # 580 "libgcc1.S" */ |