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Two small tweaks to crt0.s

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* The use of r3 in the block which copies the .data section into IWRAM is unnecessary.
* The return label in the IRQ handler doesn't need to be global.
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Thomas Winwood 2019-05-09 15:08:11 +01:00 • committed by GitHub
parent 7b79d012b4
commit fe1d75efc5
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1 changed files with 4 additions and 4 deletions
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crt0.s
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@ -24,8 +24,8 @@ __start:
@ copy .data section to IWRAM @ copy .data section to IWRAM
ldr r0, =__data_lma @ source address ldr r0, =__data_lma @ source address
ldr r1, =__data_start @ destination address ldr r1, =__data_start @ destination address
ldr r3, =__data_end ldr r2, =__data_end
sub r2, r3, r1 sub r2, r2, r1
beq .Lskip @ don't try to copy an empty .data section beq .Lskip @ don't try to copy an empty .data section
add r2, #3 add r2, #3
mov r2, r2, asr #2 @ length (in words) mov r2, r2, asr #2 @ length (in words)
@ -69,9 +69,9 @@ MainIrqHandler:
ldr r2, =__IRQ_HANDLER ldr r2, =__IRQ_HANDLER
ldr r1, [r2] ldr r1, [r2]
stmdb sp!, {lr} stmdb sp!, {lr}
adr lr, MainIrqHandler_Return adr lr, .Lreturn
bx r1 bx r1
MainIrqHandler_Return: .Lreturn:
ldmia sp!, {lr} ldmia sp!, {lr}
@ Switch to IRQ mode @ Switch to IRQ mode