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# frv testcase for sdiv $GRi,$GRj,$GRk
# mach: all

        .include "testutils.inc"

        start

        .global sdiv
sdiv:
        ; simple division 12 / 3
        set_gr_immed    3,gr3
        set_gr_immed    12,gr1
        sdiv            gr1,gr3,gr2
        test_gr_immed   4,gr2

        ; Random example
        set_gr_limmed   0x0123,0x4567,gr3
        set_gr_limmed   0xfedc,0xba98,gr1
        sdiv            gr1,gr3,gr2
        test_gr_immed   -1,gr2

        ; Special case from the Arch Spec Vol 2
        or_spr_immed    0x20,isr        ; turn on isr.edem
        set_gr_immed    -1,gr3
        set_gr_limmed   0x8000,0x0000,gr1
        sdiv            gr1,gr3,gr2
        test_gr_limmed  0x7fff,0xffff,gr2
        test_spr_bits   0x4,2,1,isr     ; isr.aexc is set

        and_spr_immed   -33,isr         ; turn off isr.edem
        ; set up exception handler
        set_psr_et      1
        and_spr_immed   -4081,tbr       ; clear tbr.tt
        set_gr_spr      tbr,gr17
        inc_gr_immed    0x170,gr17      ; address of exception handler
        set_bctrlr_0_0  gr17
        set_spr_immed   128,lcr
        set_gr_immed    0,gr15

        ; divide will cause overflow
        set_spr_addr    ok1,lr
        set_gr_addr     e1,gr17
        set_gr_immed    -1,gr3
        set_gr_limmed   0x8000,0x0000,gr1
e1:     sdiv            gr1,gr3,gr2     ; overflow
        test_gr_immed   1,gr15
        test_gr_limmed  0x8000,0x0000,gr2; gr2 updated

        ; divide by zero
        set_spr_addr    ok2,lr
        set_gr_addr     e2,gr17
        set_gr_immed    0xdeadbeef,gr2
e2:     sdiv            gr1,gr0,gr2     ; divide by zero
        test_gr_immed   2,gr15          ; handler called
        test_gr_immed   0xdeadbeef,gr2  ; gr2 not updated.

        pass

ok1:    ; exception handler for overflow
        test_spr_bits   0x18,3,0x2,isr          ; isr.dtt is set
        test_spr_gr     epcr0,gr17              ; return address set
        test_spr_bits   0x0001,0,0x1,esr0       ; esr0 is valid
        test_spr_bits   0x003e,1,0x13,esr0      ; esr0.ec is set
        inc_gr_immed    1,gr15
        rett            0
        fail

ok2:    ; exception handler for divide by zero
        test_spr_bits   0x18,3,0x3,isr          ; isr.dtt is set
        test_spr_gr     epcr0,gr17              ; return address set
        test_spr_bits   0x0001,0,0x1,esr0       ; esr0 is valid
        test_spr_bits   0x003e,1,0x13,esr0      ; esr0.ec is set
        inc_gr_immed    1,gr15
        rett            0
        fail