diff options
Diffstat (limited to 'v/entry.S')
| -rw-r--r-- | v/entry.S | 253 |
1 files changed, 115 insertions, 138 deletions
@@ -13,166 +13,143 @@ #define STACK_TOP (_end + 131072) .text - .global _start -_start: - la sp, STACK_TOP + .align 6 +entry_from_user: + j trap_entry + + .align 6 +entry_from_supervisor: + j double_fault + + .align 6 +entry_from_hypervisor: + j double_fault + + .align 6 +entry_from_machine: + j double_fault + + .align 6 +power_on_reset: + la sp, STACK_TOP - SIZEOF_TRAPFRAME_T + csrw mscratch, sp li a1, 1337 la a0, userstart j vm_boot -save_tf: # write the trap frame onto the stack + .globl pop_tf +pop_tf: + csrc mstatus, MSTATUS_IE + LOAD t0,33*REGBYTES(a0) + csrw mepc,t0 + LOAD x1,1*REGBYTES(a0) + LOAD x2,2*REGBYTES(a0) + LOAD x3,3*REGBYTES(a0) + LOAD x4,4*REGBYTES(a0) + LOAD x5,5*REGBYTES(a0) + LOAD x6,6*REGBYTES(a0) + LOAD x7,7*REGBYTES(a0) + LOAD x8,8*REGBYTES(a0) + LOAD x9,9*REGBYTES(a0) + LOAD x11,11*REGBYTES(a0) + LOAD x12,12*REGBYTES(a0) + LOAD x13,13*REGBYTES(a0) + LOAD x14,14*REGBYTES(a0) + LOAD x15,15*REGBYTES(a0) + LOAD x16,16*REGBYTES(a0) + LOAD x17,17*REGBYTES(a0) + LOAD x18,18*REGBYTES(a0) + LOAD x19,19*REGBYTES(a0) + LOAD x20,20*REGBYTES(a0) + LOAD x21,21*REGBYTES(a0) + LOAD x22,22*REGBYTES(a0) + LOAD x23,23*REGBYTES(a0) + LOAD x24,24*REGBYTES(a0) + LOAD x25,25*REGBYTES(a0) + LOAD x26,26*REGBYTES(a0) + LOAD x27,27*REGBYTES(a0) + LOAD x28,28*REGBYTES(a0) + LOAD x29,29*REGBYTES(a0) + LOAD x30,30*REGBYTES(a0) + LOAD x31,31*REGBYTES(a0) + LOAD a0,10*REGBYTES(a0) + mret + + .global trap_entry +trap_entry: + csrrw sp, mscratch, sp # 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 sup0 - csrr x3,sup1 - STORE x3,2*REGBYTES(x2) # x2 is in sup1 + STORE x1,1*REGBYTES(sp) + STORE x3,3*REGBYTES(sp) + STORE x4,4*REGBYTES(sp) + STORE x5,5*REGBYTES(sp) + STORE x6,6*REGBYTES(sp) + STORE x7,7*REGBYTES(sp) + STORE x8,8*REGBYTES(sp) + STORE x9,9*REGBYTES(sp) + STORE x10,10*REGBYTES(sp) + STORE x11,11*REGBYTES(sp) + STORE x12,12*REGBYTES(sp) + STORE x13,13*REGBYTES(sp) + STORE x14,14*REGBYTES(sp) + STORE x15,15*REGBYTES(sp) + STORE x16,16*REGBYTES(sp) + STORE x17,17*REGBYTES(sp) + STORE x18,18*REGBYTES(sp) + STORE x19,19*REGBYTES(sp) + STORE x20,20*REGBYTES(sp) + STORE x21,21*REGBYTES(sp) + STORE x22,22*REGBYTES(sp) + STORE x23,23*REGBYTES(sp) + STORE x24,24*REGBYTES(sp) + STORE x25,25*REGBYTES(sp) + STORE x26,26*REGBYTES(sp) + STORE x27,27*REGBYTES(sp) + STORE x28,28*REGBYTES(sp) + STORE x29,29*REGBYTES(sp) + STORE x30,30*REGBYTES(sp) + STORE x31,31*REGBYTES(sp) + + csrrw t0,mscratch,sp + STORE t0,2*REGBYTES(sp) # 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) + csrr t0,mstatus + STORE t0,32*REGBYTES(sp) + csrr t0,mepc + STORE t0,33*REGBYTES(sp) + csrr t0,mbadaddr + STORE t0,34*REGBYTES(sp) + csrr t0,mcause + STORE t0,35*REGBYTES(sp) # get hwacha cause if IRQ_COP # vxcptcause clears hwacha interrupt bit - bge x3,x0,1f - slli x3,x3,1 # clearing MSB of cause - srli x3,x3,1 # clearing MSB of cause - li x4,IRQ_COP - bne x3,x4,1f - vxcptcause x3 - STORE x3,36*REGBYTES(x2) + bgez t0,1f + slli t0,t0,1 # clearing MSB of cause + srli t0,t0,1 # clearing MSB of cause + li t1,IRQ_COP + bne t0,t1,1f + vxcptcause t0 + STORE t0,36*REGBYTES(sp) 1: - jr x1 - - .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,x1 - csrw sup1,x2 - - # coming from kernel? - csrr x1,status - and x1,x1,SR_PS - bnez x1, 1f - - # no, so start at the top of the stack - la x2,STACK_TOP-SIZEOF_TRAPFRAME_T - jal x1, save_tf - move sp,x2 - csrs status,SR_EI move a0,sp - csrr t0,status - and t0,t0,SR_EA + csrr t0,mstatus + li t1, MSTATUS_XS + and t0,t0,t1 beqz t0,2f + + # disable saving vector state for now addi t0,sp,SIZEOF_TRAPFRAME_T_SCALAR # rocket currently doesn't support vxcptsave/vxcptrestore natively - csrr x3,impl - li x4,IMPL_ROCKET - bne x3,x4,3f vgetcfg x4 STORE x4,0*REGBYTES(t0) vgetvl x4 STORE x4,1*REGBYTES(t0) addi t0,t0,2*REGBYTES vxcptevac t0 - j 2f - - # native vxcptsave -3:vxcptsave t0 -2:jal handle_trap - - # when coming from kernel, continue below its stack - # we assume vector unit wasn't used in kernel -1:addi x2,sp,-SIZEOF_TRAPFRAME_T_SCALAR - jal x1, save_tf - move sp,x2 - csrs status,SR_EI - move a0,sp - jal handle_trap - unimp +2:j handle_trap |