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1251d51ca5
When CONFIG_SYS_THUMB_BUILD is defined these functions may be called from Thumb code. Add the required ENTRY and ENDPROC bracketing so that BLX is used to call these ARM functions, instead of plain BL, which will fail. Signed-off-by: Simon Glass <sjg@chromium.org> Reported-by: Pavel Machek <pavel@denx.de>
96 lines
2.4 KiB
ArmAsm
96 lines
2.4 KiB
ArmAsm
#include <linux/linkage.h>
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/* # 1 "libgcc1.S" */
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@ libgcc1 routines for ARM cpu.
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@ Division routines, written by Richard Earnshaw, (rearnsha@armltd.co.uk)
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dividend .req r0
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divisor .req r1
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result .req r2
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curbit .req r3
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/* ip .req r12 */
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/* sp .req r13 */
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/* lr .req r14 */
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/* pc .req r15 */
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.text
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.globl __udivsi3
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.type __udivsi3 ,function
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.globl __aeabi_uidiv
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.type __aeabi_uidiv ,function
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.align 0
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__udivsi3:
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__aeabi_uidiv:
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cmp divisor, #0
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beq Ldiv0
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mov curbit, #1
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mov result, #0
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cmp dividend, divisor
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bcc Lgot_result
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Loop1:
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@ Unless the divisor is very big, shift it up in multiples of
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@ four bits, since this is the amount of unwinding in the main
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@ division loop. Continue shifting until the divisor is
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@ larger than the dividend.
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cmp divisor, #0x10000000
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cmpcc divisor, dividend
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movcc divisor, divisor, lsl #4
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movcc curbit, curbit, lsl #4
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bcc Loop1
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Lbignum:
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@ For very big divisors, we must shift it a bit at a time, or
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@ we will be in danger of overflowing.
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cmp divisor, #0x80000000
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cmpcc divisor, dividend
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movcc divisor, divisor, lsl #1
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movcc curbit, curbit, lsl #1
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bcc Lbignum
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Loop3:
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@ Test for possible subtractions, and note which bits
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@ are done in the result. On the final pass, this may subtract
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@ too much from the dividend, but the result will be ok, since the
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@ "bit" will have been shifted out at the bottom.
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cmp dividend, divisor
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subcs dividend, dividend, divisor
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orrcs result, result, curbit
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cmp dividend, divisor, lsr #1
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subcs dividend, dividend, divisor, lsr #1
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orrcs result, result, curbit, lsr #1
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cmp dividend, divisor, lsr #2
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subcs dividend, dividend, divisor, lsr #2
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orrcs result, result, curbit, lsr #2
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cmp dividend, divisor, lsr #3
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subcs dividend, dividend, divisor, lsr #3
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orrcs result, result, curbit, lsr #3
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cmp dividend, #0 @ Early termination?
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movnes curbit, curbit, lsr #4 @ No, any more bits to do?
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movne divisor, divisor, lsr #4
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bne Loop3
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Lgot_result:
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mov r0, result
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mov pc, lr
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Ldiv0:
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str lr, [sp, #-4]!
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bl __div0 (PLT)
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mov r0, #0 @ about as wrong as it could be
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ldmia sp!, {pc}
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.size __udivsi3 , . - __udivsi3
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ENTRY(__aeabi_uidivmod)
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stmfd sp!, {r0, r1, ip, lr}
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bl __aeabi_uidiv
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ldmfd sp!, {r1, r2, ip, lr}
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mul r3, r0, r2
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sub r1, r1, r3
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mov pc, lr
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ENDPROC(__aeabi_uidivmod)
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ENTRY(__aeabi_idivmod)
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stmfd sp!, {r0, r1, ip, lr}
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bl __aeabi_idiv
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ldmfd sp!, {r1, r2, ip, lr}
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mul r3, r0, r2
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sub r1, r1, r3
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mov pc, lr
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ENDPROC(__aeabi_idivmod)
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