xv6-cs450/trapasm.S

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ArmAsm
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.text
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.set SEG_KDATA_SEL, 0x10 # selector for SEG_KDATA
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# vectors.S sends all traps here.
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.globl alltraps
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alltraps:
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# Build trap frame.
pushl %ds
pushl %es
pushl %fs
pushl %gs
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pushal
# Set up data segments.
movl $SEG_KDATA_SEL, %eax
movw %ax,%ds
movw %ax,%es
# Call trap(tf), where tf=%esp
pushl %esp
call trap
addl $4, %esp
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# Return falls through to trapret...
.globl trapret
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trapret:
popal
popl %gs
popl %fs
popl %es
popl %ds
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addl $0x8, %esp # trapno and errcode
iret
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# A forked process switches to user mode by calling
# forkret1(tf), where tf is the trap frame to use.
.globl forkret1
forkret1:
movl 4(%esp), %esp
jmp trapret
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