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#include "riscv_test.h"
#ifdef __riscv64
# define STORE sd
# define LOAD ld
# define REGBYTES 8
#else
# define STORE sw
# define LOAD lw
# define REGBYTES 4
#endif
#define STACK_TOP (_end + 131072)
.text
.global _start
_start:
la sp, STACK_TOP
li a1, 1337
la a0, userstart
j vm_boot
save_tf: # write the trap frame onto the stack
# save gprs
STORE x3,3*REGBYTES(x2)
STORE x4,4*REGBYTES(x2)
STORE x5,5*REGBYTES(x2)
STORE x6,6*REGBYTES(x2)
STORE x7,7*REGBYTES(x2)
STORE x8,8*REGBYTES(x2)
STORE x9,9*REGBYTES(x2)
STORE x10,10*REGBYTES(x2)
STORE x11,11*REGBYTES(x2)
STORE x12,12*REGBYTES(x2)
STORE x13,13*REGBYTES(x2)
STORE x14,14*REGBYTES(x2)
STORE x15,15*REGBYTES(x2)
STORE x16,16*REGBYTES(x2)
STORE x17,17*REGBYTES(x2)
STORE x18,18*REGBYTES(x2)
STORE x19,19*REGBYTES(x2)
STORE x20,20*REGBYTES(x2)
STORE x21,21*REGBYTES(x2)
STORE x22,22*REGBYTES(x2)
STORE x23,23*REGBYTES(x2)
STORE x24,24*REGBYTES(x2)
STORE x25,25*REGBYTES(x2)
STORE x26,26*REGBYTES(x2)
STORE x27,27*REGBYTES(x2)
STORE x28,28*REGBYTES(x2)
STORE x29,29*REGBYTES(x2)
STORE x30,30*REGBYTES(x2)
STORE x31,31*REGBYTES(x2)
csrr x3,sup0
STORE x3,1*REGBYTES(x2) # x1 is in PCR_K0
csrr x3,sup1
STORE x3,2*REGBYTES(x2) # x2 is in PCR_K1
# get sr, epc, badvaddr, cause
csrr x3,status # sr
STORE x3,32*REGBYTES(x2)
csrr x4,epc # epc
STORE x4,33*REGBYTES(x2)
csrr x3,badvaddr # badvaddr
STORE x3,34*REGBYTES(x2)
csrr x3,cause # cause
STORE x3,35*REGBYTES(x2)
ret
.globl pop_tf
pop_tf: # write the trap frame onto the stack
# restore gprs
LOAD a1,32*REGBYTES(a0) # restore sr (should disable interrupts)
csrw status,a1
LOAD x1,1*REGBYTES(a0)
LOAD x2,2*REGBYTES(a0)
csrw sup0,x1
csrw sup1,x2
move x1,a0
LOAD x3,3*REGBYTES(x1)
LOAD x4,4*REGBYTES(x1)
LOAD x5,5*REGBYTES(x1)
LOAD x6,6*REGBYTES(x1)
LOAD x7,7*REGBYTES(x1)
LOAD x8,8*REGBYTES(x1)
LOAD x9,9*REGBYTES(x1)
LOAD x10,10*REGBYTES(x1)
LOAD x11,11*REGBYTES(x1)
LOAD x12,12*REGBYTES(x1)
LOAD x13,13*REGBYTES(x1)
LOAD x14,14*REGBYTES(x1)
LOAD x15,15*REGBYTES(x1)
LOAD x16,16*REGBYTES(x1)
LOAD x17,17*REGBYTES(x1)
LOAD x18,18*REGBYTES(x1)
LOAD x19,19*REGBYTES(x1)
LOAD x20,20*REGBYTES(x1)
LOAD x21,21*REGBYTES(x1)
LOAD x22,22*REGBYTES(x1)
LOAD x23,23*REGBYTES(x1)
LOAD x24,24*REGBYTES(x1)
LOAD x25,25*REGBYTES(x1)
LOAD x26,26*REGBYTES(x1)
LOAD x27,27*REGBYTES(x1)
LOAD x28,28*REGBYTES(x1)
LOAD x29,29*REGBYTES(x1)
LOAD x30,30*REGBYTES(x1)
LOAD x31,31*REGBYTES(x1)
# gtfo!
LOAD x2,33*REGBYTES(x1)
csrw epc,x2
csrr x1,sup0
csrr x2,sup1
sret
.global trap_entry
trap_entry:
csrw sup0,ra
csrw sup1,x2
# coming from kernel?
csrr ra,status
and ra,ra,SR_PS
bnez ra, 1f
# no, so start at the top of the stack
la x2,STACK_TOP-SIZEOF_TRAPFRAME_T
jal save_tf
move sp,x2
csrs status,SR_EI
move a0,x2
csrr ra,status
and ra,ra,SR_EA
beqz ra, 2f
addi x2,x2,36*REGBYTES
# rocket currently doesn't support vxcptsave/vxcptrestore natively
csrr x3,impl
li x4,IMPL_ROCKET
bne x3,x4,3f
vgetcfg x4
sd x4,0(x2)
vgetvl x4
sd x4,8(x2)
addi x2,x2,16
vxcptevac x2
j 2f
# native vxcptsave
3:vxcptsave x2
2:jal handle_trap
# when coming from kernel, continue below its stack
1:li x2,17712
sub x2, sp, x2
jal save_tf
move sp,x2
csrs status,SR_EI
move a0,x2
jal handle_trap
unimp
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