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handlers.S
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handlers.S
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#define LOAD ld
#define STORE sd
#define REGLEN (8)
.macro SAVE_CONTEXT
add sp, sp, -(REGLEN*31)
STORE x1, 0*REGLEN(sp)
STORE x3, 2*REGLEN(sp)
STORE x4, 3*REGLEN(sp)
STORE x5, 4*REGLEN(sp)
STORE x6, 5*REGLEN(sp)
STORE x7, 6*REGLEN(sp)
STORE x8, 7*REGLEN(sp)
STORE x9, 8*REGLEN(sp)
STORE x10, 9*REGLEN(sp)
STORE x11, 10*REGLEN(sp)
STORE x12, 11*REGLEN(sp)
STORE x13, 12*REGLEN(sp)
STORE x14, 13*REGLEN(sp)
STORE x15, 14*REGLEN(sp)
STORE x16, 15*REGLEN(sp)
STORE x17, 16*REGLEN(sp)
STORE x18, 17*REGLEN(sp)
STORE x19, 18*REGLEN(sp)
STORE x20, 19*REGLEN(sp)
STORE x21, 20*REGLEN(sp)
STORE x22, 21*REGLEN(sp)
STORE x23, 22*REGLEN(sp)
STORE x24, 23*REGLEN(sp)
STORE x25, 24*REGLEN(sp)
STORE x26, 25*REGLEN(sp)
STORE x27, 26*REGLEN(sp)
STORE x28, 27*REGLEN(sp)
STORE x29, 28*REGLEN(sp)
STORE x30, 29*REGLEN(sp)
STORE x31, 29*REGLEN(sp)
.endm
.macro RESTORE_CONTEXT
LOAD x1, 0*REGLEN(sp)
LOAD x3, 2*REGLEN(sp)
LOAD x4, 3*REGLEN(sp)
LOAD x5, 4*REGLEN(sp)
LOAD x6, 5*REGLEN(sp)
LOAD x7, 6*REGLEN(sp)
LOAD x8, 7*REGLEN(sp)
LOAD x9, 8*REGLEN(sp)
LOAD x10, 9*REGLEN(sp)
LOAD x11, 10*REGLEN(sp)
LOAD x12, 11*REGLEN(sp)
LOAD x13, 12*REGLEN(sp)
LOAD x14, 13*REGLEN(sp)
LOAD x15, 14*REGLEN(sp)
LOAD x16, 15*REGLEN(sp)
LOAD x17, 16*REGLEN(sp)
LOAD x18, 17*REGLEN(sp)
LOAD x19, 18*REGLEN(sp)
LOAD x20, 19*REGLEN(sp)
LOAD x21, 20*REGLEN(sp)
LOAD x22, 21*REGLEN(sp)
LOAD x23, 22*REGLEN(sp)
LOAD x24, 23*REGLEN(sp)
LOAD x25, 24*REGLEN(sp)
LOAD x26, 25*REGLEN(sp)
LOAD x27, 26*REGLEN(sp)
LOAD x28, 27*REGLEN(sp)
LOAD x29, 28*REGLEN(sp)
LOAD x30, 29*REGLEN(sp)
LOAD x31, 30*REGLEN(sp)
add sp, sp, (REGLEN*31)
.endm
.balign 0x4
.global mhandler_entry
mhandler_entry:
SAVE_CONTEXT
jal mhandler
j _return
.balign 0x4
.global hshandler_entry
hshandler_entry:
SAVE_CONTEXT
jal hshandler
j _return
.balign 0x4
.global vshandler_entry
vshandler_entry:
SAVE_CONTEXT
jal vshandler
j _return
_return:
li t0, 4 //make sure PRIV_M is 4
beq a0, t0, _return_from_m
_return_from_s:
RESTORE_CONTEXT
sret
j .
_return_from_m:
RESTORE_CONTEXT
mret