ref: c116550e6a41572796e4db65e4f6acbcb3d9d6f8
dir: /os/ks32/l.s/
#include "mem.h" /* * Entered from the boot loader with * supervisor mode, interrupts disabled; */ TEXT _startup(SB), $-4 MOVW $setR12(SB), R12 /* static base (SB) */ MOVW $Mach0(SB), R13 ADD $(KSTACK-4), R13 /* leave 4 bytes for link */ MOVW $(PsrDirq|PsrDfiq|PsrMsvc), R1 /* Switch to SVC mode */ MOVW R1, CPSR BL main(SB) /* jump to kernel */ dead: B dead BL _div(SB) /* hack to get _div etc loaded */ GLOBL Mach0(SB), $KSTACK TEXT setr13(SB), $-4 MOVW 4(FP), R1 MOVW CPSR, R2 BIC $PsrMask, R2, R3 ORR R0, R3 MOVW R3, CPSR MOVW R13, R0 MOVW R1, R13 MOVW R2, CPSR RET TEXT _vundcall(SB), $-4 _vund: MOVM.DB [R0-R3], (R13) MOVW $PsrMund, R0 B _vswitch TEXT _vsvccall(SB), $-4 _vsvc: MOVW.W R14, -4(R13) MOVW CPSR, R14 MOVW.W R14, -4(R13) BIC $PsrMask, R14 ORR $(PsrDirq|PsrDfiq|PsrMsvc), R14 MOVW R14, CPSR MOVW $PsrMsvc, R14 MOVW.W R14, -4(R13) B _vsaveu TEXT _vpabcall(SB), $-4 _vpab: MOVM.DB [R0-R3], (R13) MOVW $PsrMabt, R0 B _vswitch TEXT _vdabcall(SB), $-4 _vdab: MOVM.DB [R0-R3], (R13) MOVW $(PsrMabt+1), R0 B _vswitch TEXT _vfiqcall(SB), $-4 /* IRQ */ _vfiq: /* FIQ */ MOVM.DB [R0-R3], (R13) MOVW $PsrMfiq, R0 B _vswitch TEXT _virqcall(SB), $-4 /* IRQ */ _virq: MOVM.DB [R0-R3], (R13) MOVW $PsrMirq, R0 _vswitch: /* switch to svc mode */ MOVW SPSR, R1 MOVW R14, R2 MOVW R13, R3 MOVW CPSR, R14 BIC $PsrMask, R14 ORR $(PsrDirq|PsrDfiq|PsrMsvc), R14 MOVW R14, CPSR MOVM.DB.W [R0-R2], (R13) MOVM.DB (R3), [R0-R3] _vsaveu: /* Save Registers */ MOVW.W R14, -4(R13) /* save link */ /* MCR CpMMU, 0, R0, C(0), C(0), 0 */ SUB $8, R13 MOVM.DB.W [R0-R12], (R13) MOVW R0, R0 /* gratuitous noop */ MOVW $setR12(SB), R12 /* static base (SB) */ MOVW R13, R0 /* argument is ureg */ SUB $8, R13 /* space for arg+lnk*/ BL trap(SB) _vrfe: /* Restore Regs */ MOVW CPSR, R0 /* splhi on return */ ORR $(PsrDirq|PsrDfiq), R0, R1 MOVW R1, CPSR ADD $(8+4*15), R13 /* [r0-R14]+argument+link */ MOVW (R13), R14 /* restore link */ MOVW 8(R13), R0 MOVW R0, SPSR MOVM.DB.S (R13), [R0-R14] /* restore user registers */ MOVW R0, R0 /* gratuitous nop */ ADD $12, R13 /* skip saved link+type+SPSR*/ RFE /* MOVM.IA.S.W (R13), [R15] */ TEXT splhi(SB), $-4 MOVW CPSR, R0 ORR $(PsrDirq), R0, R1 MOVW R1, CPSR RET TEXT spllo(SB), $-4 MOVW CPSR, R0 BIC $(PsrDirq|PsrDfiq), R0, R1 MOVW R1, CPSR RET TEXT splx(SB), $-4 /* BUG - save PC in m->splpc - JB */ TEXT splxpc(SB), $-4 MOVW R0, R1 MOVW CPSR, R0 MOVW R1, CPSR RET TEXT islo(SB), $-4 MOVW CPSR, R0 AND $(PsrDirq), R0 EOR $(PsrDirq), R0 RET TEXT splfhi(SB), $-4 MOVW CPSR, R0 ORR $(PsrDfiq|PsrDirq), R0, R1 MOVW R1, CPSR RET TEXT splflo(SB), $-4 MOVW CPSR, R0 BIC $(PsrDfiq), R0, R1 MOVW R1, CPSR RET TEXT cpsrr(SB), $-4 MOVW CPSR, R0 RET TEXT spsrr(SB), $-4 MOVW SPSR, R0 RET TEXT getcallerpc(SB), $-4 MOVW 0(R13), R0 RET TEXT _tas(SB), $-4 MOVW R0, R1 MOVW $0xDEADDEAD, R2 SWPW R2, (R1), R0 RET TEXT setlabel(SB), $-4 MOVW R13, 0(R0) /* sp */ MOVW R14, 4(R0) /* pc */ MOVW $0, R0 RET TEXT gotolabel(SB), $-4 MOVW 0(R0), R13 /* sp */ MOVW 4(R0), R14 /* pc */ MOVW $1, R0 BX (R14) TEXT outs(SB), $-4 MOVW 4(FP),R1 WORD $0xe1c010b0 /* STR H R1,[R0+0] */ RET TEXT ins(SB), $-4 WORD $0xe1d000b0 /* LDRHU R0,[R0+0] */ RET /* for devboot */ TEXT gotopc(SB), $-4 /* MOVW R0, R1 MOVW bootparam(SB), R0 MOVW R1, PC */ RET