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https://github.com/fluencelabs/musl
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21419914c5
this code was using $10 to save the syscall number, but $10 is not necessarily preserved by the kernel across syscalls. only mattered for syscalls that got interrupted by a signal and restarted. as far as i can tell, $25 is preserved by the kernel across syscalls.
23 lines
376 B
ArmAsm
23 lines
376 B
ArmAsm
.set noreorder
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.global __syscall
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.type __syscall,@function
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__syscall:
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move $25, $4
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move $4, $5
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move $5, $6
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move $6, $7
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lw $7, 16($sp)
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lw $8, 20($sp)
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lw $9, 24($sp)
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subu $sp, $sp, 32
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sw $8, 16($sp)
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sw $9, 20($sp)
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move $2, $25
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syscall
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beq $7, $0, 1f
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addu $sp, $sp, 32
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subu $2, $0, $2
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1: jr $ra
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nop
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