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141 lines
3.0 KiB
141 lines
3.0 KiB
// See LICENSE for license details.
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#include "encoding.h"
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#ifdef __riscv64
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# define STORE sd
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# define LOAD ld
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# define REGBYTES 8
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#else
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# define STORE sw
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# define LOAD lw
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# define REGBYTES 4
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#endif
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.macro save_tf
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# save gprs
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STORE x3,3*REGBYTES(x2)
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STORE x4,4*REGBYTES(x2)
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STORE x5,5*REGBYTES(x2)
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STORE x6,6*REGBYTES(x2)
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STORE x7,7*REGBYTES(x2)
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STORE x8,8*REGBYTES(x2)
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STORE x9,9*REGBYTES(x2)
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STORE x10,10*REGBYTES(x2)
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STORE x11,11*REGBYTES(x2)
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STORE x12,12*REGBYTES(x2)
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STORE x13,13*REGBYTES(x2)
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STORE x14,14*REGBYTES(x2)
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STORE x15,15*REGBYTES(x2)
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STORE x16,16*REGBYTES(x2)
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STORE x17,17*REGBYTES(x2)
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STORE x18,18*REGBYTES(x2)
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STORE x19,19*REGBYTES(x2)
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STORE x20,20*REGBYTES(x2)
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STORE x21,21*REGBYTES(x2)
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STORE x22,22*REGBYTES(x2)
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STORE x23,23*REGBYTES(x2)
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STORE x24,24*REGBYTES(x2)
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STORE x25,25*REGBYTES(x2)
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STORE x26,26*REGBYTES(x2)
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STORE x27,27*REGBYTES(x2)
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STORE x28,28*REGBYTES(x2)
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STORE x29,29*REGBYTES(x2)
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STORE x30,30*REGBYTES(x2)
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STORE x31,31*REGBYTES(x2)
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# get sr, epc, badvaddr, cause
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csrr x3,sup0 # x1
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csrr x4,sup1 # x2
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csrr x5,status
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csrr x6,epc
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csrr x7,badvaddr
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csrr x8,cause
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STORE x3,1*REGBYTES(x2)
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STORE x4,2*REGBYTES(x2)
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STORE x5,32*REGBYTES(x2)
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STORE x6,33*REGBYTES(x2)
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STORE x7,34*REGBYTES(x2)
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STORE x8,35*REGBYTES(x2)
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# get faulting insn, if it wasn't a fetch-related trap
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li x5,-1
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STORE x5,36*REGBYTES(x2)
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1:
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.endm
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.text
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.globl pop_tf
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pop_tf: # write the trap frame onto the stack
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# restore gprs
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LOAD a1,32*REGBYTES(a0)
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LOAD a2,1*REGBYTES(a0)
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LOAD a3,2*REGBYTES(a0)
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csrw status, a1 # restore sr (disable interrupts)
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csrw sup0, a2
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csrw sup1, a3
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move x1,a0
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LOAD x3,3*REGBYTES(x1)
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LOAD x4,4*REGBYTES(x1)
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LOAD x5,5*REGBYTES(x1)
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LOAD x6,6*REGBYTES(x1)
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LOAD x7,7*REGBYTES(x1)
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LOAD x8,8*REGBYTES(x1)
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LOAD x9,9*REGBYTES(x1)
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LOAD x10,10*REGBYTES(x1)
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LOAD x11,11*REGBYTES(x1)
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LOAD x12,12*REGBYTES(x1)
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LOAD x13,13*REGBYTES(x1)
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LOAD x14,14*REGBYTES(x1)
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LOAD x15,15*REGBYTES(x1)
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LOAD x16,16*REGBYTES(x1)
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LOAD x17,17*REGBYTES(x1)
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LOAD x18,18*REGBYTES(x1)
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LOAD x19,19*REGBYTES(x1)
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LOAD x20,20*REGBYTES(x1)
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LOAD x21,21*REGBYTES(x1)
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LOAD x22,22*REGBYTES(x1)
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LOAD x23,23*REGBYTES(x1)
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LOAD x24,24*REGBYTES(x1)
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LOAD x25,25*REGBYTES(x1)
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LOAD x26,26*REGBYTES(x1)
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LOAD x27,27*REGBYTES(x1)
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LOAD x28,28*REGBYTES(x1)
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LOAD x29,29*REGBYTES(x1)
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LOAD x30,30*REGBYTES(x1)
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LOAD x31,31*REGBYTES(x1)
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# gtfo!
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LOAD x2,33*REGBYTES(x1)
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csrr x1, sup0
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csrw epc, x2
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csrr x2, sup1
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sret
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.global trap_entry
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trap_entry:
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csrw sup0, x1
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csrw sup1, x2
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# when coming from kernel, continue below its stack
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csrr x1, status
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and x1, x1, SR_PS
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add x2, sp, -320
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bnez x1, 1f
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la x2, stack_top-320
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1:save_tf
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move sp,x2
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move a0,x2
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j handle_trap
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.bss
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.align 4
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.global stack_bot
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.global stack_top
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stack_bot:
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.skip 4096
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stack_top:
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