ref: a57a6e511f15c02b4fd2690197b6f1333b171193
dir: /sys/src/9/alphapc/l.s/
#include "mem.h" #include "osf1pal.h" #define SP R30 #define HI_IPL 6 /* use 7 to disable mchecks */ TEXT _main(SB), $-8 MOVQ $setSB(SB), R29 MOVQ R29, R16 CALL_PAL $PALwrkgp MOVQ $mach0(SB), R(MACH) MOVQ $(BY2PG-8)(R(MACH)), R30 MOVQ R31, R(USER) MOVQ R31, 0(R(MACH)) MOVQ $edata(SB), R1 MOVQ $end(SB), R2 clrbss: MOVQ R31, (R1) ADDQ $8, R1 CMPUGT R1, R2, R3 BEQ R3, clrbss MOVL R0, bootconf(SB) /* passed in from boot loader */ _fpinit: MOVQ $1, R16 CALL_PAL $PALwrfen MOVQ initfpcr(SB), R1 /* MOVQ $0x2800800000000000, R1 */ MOVQ R1, (R30) MOVT (R30), F1 MOVT F1, FPCR MOVT $0.5, F28 ADDT F28, F28, F29 ADDT F29, F29, F30 MOVT F31, F1 MOVT F31, F2 MOVT F31, F3 MOVT F31, F4 MOVT F31, F5 MOVT F31, F6 MOVT F31, F7 MOVT F31, F8 MOVT F31, F9 MOVT F31, F10 MOVT F31, F11 MOVT F31, F12 MOVT F31, F13 MOVT F31, F14 MOVT F31, F15 MOVT F31, F16 MOVT F31, F17 MOVT F31, F18 MOVT F31, F19 MOVT F31, F20 MOVT F31, F21 MOVT F31, F22 MOVT F31, F23 MOVT F31, F24 MOVT F31, F25 MOVT F31, F26 MOVT F31, F27 JSR main(SB) MOVQ $_divq(SB), R31 /* touch _divq etc.; doesn't need to execute */ MOVQ $_divl(SB), R31 /* touch _divl etc.; doesn't need to execute */ RET TEXT setpcb(SB), $-8 MOVQ R30, (R0) AND $0x7FFFFFFF, R0, R16 /* make address physical */ CALL_PAL $PALswpctx RET GLOBL mach0(SB), $(MAXMACH*BY2PG) GLOBL init_ptbr(SB), $8 TEXT firmware(SB), $-8 CALL_PAL $PALhalt TEXT xxfirmware(SB), $-8 CALL_PAL $PALhalt TEXT splhi(SB), $0 MOVL R26, 4(R(MACH)) /* save PC in m->splpc */ MOVQ $HI_IPL, R16 CALL_PAL $PALswpipl RET TEXT spllo(SB), $0 MOVQ R31, R16 CALL_PAL $PALswpipl RET TEXT splx(SB), $0 MOVL R26, 4(R(MACH)) /* save PC in m->splpc */ TEXT splxpc(SB), $0 /* for iunlock */ MOVQ R0, R16 CALL_PAL $PALswpipl RET TEXT spldone(SB), $0 RET TEXT islo(SB), $0 CALL_PAL $PALrdps AND $IPL, R0 XOR $HI_IPL, R0 RET TEXT mb(SB), $-8 MB RET TEXT icflush(SB), $-8 CALL_PAL $PALimb RET TEXT tlbflush(SB), $-8 MOVQ R0, R16 MOVL 4(FP), R17 CALL_PAL $PALtbi RET TEXT swpctx(SB), $-8 MOVQ R0, R16 AND $0x7FFFFFFF, R16 /* make address physical */ CALL_PAL $PALswpctx RET TEXT wrent(SB), $-8 MOVQ R0, R17 MOVL 4(FP), R16 CALL_PAL $PALwrent RET TEXT wrvptptr(SB), $-8 MOVQ R0, R16 CALL_PAL $PALwrvptptr RET TEXT cserve(SB), $-8 MOVQ R0, R16 MOVL 4(FP), R17 CALL_PAL $PALcserve RET TEXT setlabel(SB), $-8 MOVL R30, 0(R0) MOVL R26, 4(R0) MOVQ $0, R0 RET TEXT gotolabel(SB), $-8 MOVL 0(R0), R30 MOVL 4(R0), R26 MOVQ $1, R0 RET TEXT tas(SB), $-8 MOVQ R0, R1 /* l */ tas1: MOVLL (R1), R0 /* l->key */ BNE R0, tas2 MOVQ $1, R2 MOVLC R2, (R1) /* l->key = 1 */ BEQ R2, tas1 /* write failed, try again? */ tas2: RET TEXT cmpswap(SB), $-8 MOVQ R0, R1 /* p */ MOVL old+4(FP), R2 MOVL new+8(FP), R3 MOVLL (R1), R0 CMPEQ R0, R2, R4 BEQ R4, fail /* if R0 != [sic] R2, goto fail */ MOVQ R3, R0 MOVLC R0, (R1) RET fail: MOVL $0, R0 RET TEXT fpenab(SB), $-8 MOVQ R0, R16 CALL_PAL $PALwrfen RET TEXT rpcc(SB), $0 MOVL R0, R1 MOVL $0, R0 WORD $0x6000C000 /* RPCC R0 */ BEQ R1, _ret MOVQ R0, (R1) _ret: RET /* * Exception handlers. The stack frame looks like this: * * R30+0: (unused) link reg storage (R26) (32 bits) * R30+4: padding for alignment (32 bits) * R30+8: trap()'s first arg storage (R0) (32 bits -- type Ureg*) * R30+12: padding for alignment (32 bits) * R30+16: first 31 fields of Ureg, saved here (31*64 bits) * R30+264: other 6 fields of Ureg, saved by PALcode (6*64 bits) * R30+312: previous value of KSP before trap */ TEXT arith(SB), $-8 SUBQ $(4*BY2WD+31*BY2V), R30 MOVQ R0, (4*BY2WD+4*BY2V)(R30) MOVQ $1, R0 JMP trapcommon TEXT illegal0(SB), $-8 SUBQ $(4*BY2WD+31*BY2V), R30 MOVQ R0, (4*BY2WD+4*BY2V)(R30) MOVQ $2, R0 JMP trapcommon TEXT fault0(SB), $-8 SUBQ $(4*BY2WD+31*BY2V), R30 MOVQ R0, (4*BY2WD+4*BY2V)(R30) MOVQ $4, R0 JMP trapcommon TEXT unaligned(SB), $-8 SUBQ $(4*BY2WD+31*BY2V), R30 MOVQ R0, (4*BY2WD+4*BY2V)(R30) MOVQ $6, R0 JMP trapcommon TEXT intr0(SB), $-8 SUBQ $(4*BY2WD+31*BY2V), R30 MOVQ R0, (4*BY2WD+4*BY2V)(R30) MOVQ $3, R0 trapcommon: MOVQ R0, (4*BY2WD+0*BY2V)(R30) MOVQ R16, (4*BY2WD+1*BY2V)(R30) MOVQ R17, (4*BY2WD+2*BY2V)(R30) MOVQ R18, (4*BY2WD+3*BY2V)(R30) /* R0 already saved, (4*BY2WD+4*BY2V)(R30) */ MOVQ R1, (4*BY2WD+5*BY2V)(R30) MOVQ R2, (4*BY2WD+6*BY2V)(R30) MOVQ R3, (4*BY2WD+7*BY2V)(R30) MOVQ R4, (4*BY2WD+8*BY2V)(R30) MOVQ R5, (4*BY2WD+9*BY2V)(R30) MOVQ R6, (4*BY2WD+10*BY2V)(R30) MOVQ R7, (4*BY2WD+11*BY2V)(R30) MOVQ R8, (4*BY2WD+12*BY2V)(R30) MOVQ R9, (4*BY2WD+13*BY2V)(R30) MOVQ R10, (4*BY2WD+14*BY2V)(R30) MOVQ R11, (4*BY2WD+15*BY2V)(R30) MOVQ R12, (4*BY2WD+16*BY2V)(R30) MOVQ R13, (4*BY2WD+17*BY2V)(R30) MOVQ R14, (4*BY2WD+18*BY2V)(R30) MOVQ R15, (4*BY2WD+19*BY2V)(R30) MOVQ R19, (4*BY2WD+20*BY2V)(R30) MOVQ R20, (4*BY2WD+21*BY2V)(R30) MOVQ R21, (4*BY2WD+22*BY2V)(R30) MOVQ R22, (4*BY2WD+23*BY2V)(R30) MOVQ R23, (4*BY2WD+24*BY2V)(R30) MOVQ R24, (4*BY2WD+25*BY2V)(R30) MOVQ R25, (4*BY2WD+26*BY2V)(R30) MOVQ R26, (4*BY2WD+27*BY2V)(R30) MOVQ R27, (4*BY2WD+28*BY2V)(R30) MOVQ R28, (4*BY2WD+29*BY2V)(R30) MOVQ $HI_IPL, R16 CALL_PAL $PALswpipl CALL_PAL $PALrdusp MOVQ R0, (4*BY2WD+30*BY2V)(R30) /* save USP */ MOVQ $mach0(SB), R(MACH) MOVQ $(4*BY2WD)(R30), R0 JSR trap(SB) trapret: MOVQ (4*BY2WD+30*BY2V)(R30), R16 /* USP */ CALL_PAL $PALwrusp /* ... */ MOVQ (4*BY2WD+4*BY2V)(R30), R0 MOVQ (4*BY2WD+5*BY2V)(R30), R1 MOVQ (4*BY2WD+6*BY2V)(R30), R2 MOVQ (4*BY2WD+7*BY2V)(R30), R3 MOVQ (4*BY2WD+8*BY2V)(R30), R4 MOVQ (4*BY2WD+9*BY2V)(R30), R5 MOVQ (4*BY2WD+10*BY2V)(R30), R6 MOVQ (4*BY2WD+11*BY2V)(R30), R7 MOVQ (4*BY2WD+12*BY2V)(R30), R8 MOVQ (4*BY2WD+13*BY2V)(R30), R9 MOVQ (4*BY2WD+14*BY2V)(R30), R10 MOVQ (4*BY2WD+15*BY2V)(R30), R11 MOVQ (4*BY2WD+16*BY2V)(R30), R12 MOVQ (4*BY2WD+17*BY2V)(R30), R13 MOVQ (4*BY2WD+18*BY2V)(R30), R14 MOVQ (4*BY2WD+19*BY2V)(R30), R15 MOVQ (4*BY2WD+20*BY2V)(R30), R19 MOVQ (4*BY2WD+21*BY2V)(R30), R20 MOVQ (4*BY2WD+22*BY2V)(R30), R21 MOVQ (4*BY2WD+23*BY2V)(R30), R22 MOVQ (4*BY2WD+24*BY2V)(R30), R23 MOVQ (4*BY2WD+25*BY2V)(R30), R24 MOVQ (4*BY2WD+26*BY2V)(R30), R25 MOVQ (4*BY2WD+27*BY2V)(R30), R26 MOVQ (4*BY2WD+28*BY2V)(R30), R27 MOVQ (4*BY2WD+29*BY2V)(R30), R28 /* USP already restored from (4*BY2WD+30*BY2V)(R30) */ ADDQ $(4*BY2WD+31*BY2V), R30 CALL_PAL $PALrti TEXT forkret(SB), $0 MOVQ R31, R0 /* Fake out system call return */ JMP systrapret TEXT syscall0(SB), $-8 SUBQ $(4*BY2WD+31*BY2V), R30 MOVQ R0, (4*BY2WD+4*BY2V)(R30) /* save scallnr in R0 */ MOVQ $HI_IPL, R16 CALL_PAL $PALswpipl MOVQ $mach0(SB), R(MACH) CALL_PAL $PALrdusp MOVQ R0, (4*BY2WD+30*BY2V)(R30) /* save USP */ MOVQ R26, (4*BY2WD+27*BY2V)(R30) /* save last return address */ MOVQ $(4*BY2WD)(R30), R0 /* pass address of Ureg */ JSR syscall(SB) systrapret: MOVQ (4*BY2WD+30*BY2V)(R30), R16 /* USP */ CALL_PAL $PALwrusp /* consider doing this in execregs... */ MOVQ (4*BY2WD+27*BY2V)(R30), R26 /* restore last return address */ ADDQ $(4*BY2WD+31*BY2V), R30 CALL_PAL $PALretsys /* * Take first processor into user mode * - argument is stack pointer to user */ TEXT touser(SB), $-8 MOVQ R0, R16 CALL_PAL $PALwrusp /* set USP to value passed */ SUBQ $(6*BY2V), R30 /* create frame for retsys */ MOVQ $(UTZERO+32), R26 /* header appears in text */ MOVQ R26, (1*BY2V)(R30) /* PC -- only reg that matters */ CALL_PAL $PALretsys TEXT rfnote(SB), $0 SUBL $(2*BY2WD), R0, SP JMP trapret TEXT savefpregs(SB), $-8 MOVT F0, 0x00(R0) MOVT F1, 0x08(R0) MOVT F2, 0x10(R0) MOVT F3, 0x18(R0) MOVT F4, 0x20(R0) MOVT F5, 0x28(R0) MOVT F6, 0x30(R0) MOVT F7, 0x38(R0) MOVT F8, 0x40(R0) MOVT F9, 0x48(R0) MOVT F10, 0x50(R0) MOVT F11, 0x58(R0) MOVT F12, 0x60(R0) MOVT F13, 0x68(R0) MOVT F14, 0x70(R0) MOVT F15, 0x78(R0) MOVT F16, 0x80(R0) MOVT F17, 0x88(R0) MOVT F18, 0x90(R0) MOVT F19, 0x98(R0) MOVT F20, 0xA0(R0) MOVT F21, 0xA8(R0) MOVT F22, 0xB0(R0) MOVT F23, 0xB8(R0) MOVT F24, 0xC0(R0) MOVT F25, 0xC8(R0) MOVT F26, 0xD0(R0) MOVT F27, 0xD8(R0) MOVT F28, 0xE0(R0) MOVT F29, 0xE8(R0) MOVT F30, 0xF0(R0) MOVT F31, 0xF8(R0) MOVT FPCR, F0 MOVT F0, 0x100(R0) MOVQ $0, R16 CALL_PAL $PALwrfen /* disable */ RET TEXT restfpregs(SB), $-8 MOVQ $1, R16 CALL_PAL $PALwrfen /* enable */ MOVT 0x100(R0), F0 MOVT F0, FPCR MOVT 0x00(R0), F0 MOVT 0x08(R0), F1 MOVT 0x10(R0), F2 MOVT 0x18(R0), F3 MOVT 0x20(R0), F4 MOVT 0x28(R0), F5 MOVT 0x30(R0), F6 MOVT 0x38(R0), F7 MOVT 0x40(R0), F8 MOVT 0x48(R0), F9 MOVT 0x50(R0), F10 MOVT 0x58(R0), F11 MOVT 0x60(R0), F12 MOVT 0x68(R0), F13 MOVT 0x70(R0), F14 MOVT 0x78(R0), F15 MOVT 0x80(R0), F16 MOVT 0x88(R0), F17 MOVT 0x90(R0), F18 MOVT 0x98(R0), F19 MOVT 0xA0(R0), F20 MOVT 0xA8(R0), F21 MOVT 0xB0(R0), F22 MOVT 0xB8(R0), F23 MOVT 0xC0(R0), F24 MOVT 0xC8(R0), F25 MOVT 0xD0(R0), F26 MOVT 0xD8(R0), F27 MOVT 0xE0(R0), F28 MOVT 0xE8(R0), F29 MOVT 0xF0(R0), F30 MOVT 0xF8(R0), F31 RET