| /* |
| * tbisoft.S |
| * |
| * Copyright (C) 2001, 2002, 2007, 2012 Imagination Technologies. |
| * |
| * This program is free software; you can redistribute it and/or modify it under |
| * the terms of the GNU General Public License version 2 as published by the |
| * Free Software Foundation. |
| * |
| * Support for soft threads and soft context switches |
| */ |
| |
| .file "tbisoft.S" |
| |
| #include <asm/tbx.h> |
| |
| #ifdef METAC_1_0 |
| /* Ax.4 is saved in TBICTX */ |
| #define A0_4 ,A0.4 |
| #define D0_5 ,D0.5 |
| #else |
| /* Ax.4 is NOT saved in TBICTX */ |
| #define A0_4 |
| #define D0_5 |
| #endif |
| |
| /* Size of the TBICTX structure */ |
| #define TBICTX_BYTES ((TBICTX_AX_REGS*8)+TBICTX_AX) |
| |
| .text |
| .balign 4 |
| .global ___TBISwitchTail |
| .type ___TBISwitchTail,function |
| ___TBISwitchTail: |
| B $LSwitchTail |
| .size ___TBISwitchTail,.-___TBISwitchTail |
| |
| /* |
| * TBIRES __TBIJumpX( TBIX64 ArgsA, PTBICTX *rpSaveCtx, int TrigsMask, |
| * void (*fnMain)(), void *pStack ); |
| * |
| * This is a combination of __TBISwitch and __TBIJump with the context of |
| * the calling thread being saved in the rpSaveCtx location with a drop-thru |
| * effect into the __TBIJump logic. ArgsB passes via __TBIJump to the |
| * routine eventually invoked will reflect the rpSaveCtx value specified. |
| */ |
| .text |
| .balign 4 |
| .global ___TBIJumpX |
| .type ___TBIJumpX,function |
| ___TBIJumpX: |
| CMP D1RtP,#-1 |
| B $LSwitchStart |
| .size ___TBIJumpX,.-___TBIJumpX |
| |
| /* |
| * TBIRES __TBISwitch( TBIRES Switch, PTBICTX *rpSaveCtx ) |
| * |
| * Software synchronous context switch between soft threads, save only the |
| * registers which are actually valid on call entry. |
| * |
| * A0FrP, D0RtP, D0.5, D0.6, D0.7 - Saved on stack |
| * A1GbP is global to all soft threads so not virtualised |
| * A0StP is then saved as the base of the TBICTX of the thread |
| * |
| */ |
| .text |
| .balign 4 |
| .global ___TBISwitch |
| .type ___TBISwitch,function |
| ___TBISwitch: |
| XORS D0Re0,D0Re0,D0Re0 /* Set ZERO flag */ |
| $LSwitchStart: |
| MOV D0FrT,A0FrP /* Boing entry sequence */ |
| ADD A0FrP,A0StP,#0 |
| SETL [A0StP+#8++],D0FrT,D1RtP |
| /* |
| * Save current frame state - we save all regs because we don't want |
| * uninitialised crap in the TBICTX structure that the asynchronous resumption |
| * of a thread will restore. |
| */ |
| MOVT D1Re0,#HI($LSwitchExit) /* ASync resume point here */ |
| ADD D1Re0,D1Re0,#LO($LSwitchExit) |
| SETD [D1Ar3],A0StP /* Record pCtx of this thread */ |
| MOVT D0Re0,#TBICTX_SOFT_BIT /* Only soft thread state */ |
| SETL [A0StP++],D0Re0,D1Re0 /* Push header fields */ |
| ADD D0FrT,A0StP,#TBICTX_AX-TBICTX_DX /* Address AX save area */ |
| MOV D0Re0,#0 /* Setup 0:0 result for ASync */ |
| MOV D1Re0,#0 /* resume of the thread */ |
| MSETL [A0StP],D0Re0,D0Ar6,D0Ar4,D0Ar2,D0FrT,D0.5,D0.6,D0.7 |
| SETL [A0StP++],D0Re0,D1Re0 /* Zero CurrRPT, CurrBPOBITS, */ |
| SETL [A0StP++],D0Re0,D1Re0 /* Zero CurrMODE, CurrDIVTIME */ |
| ADD A0StP,A0StP,#(TBICTX_AX_REGS*8) /* Reserve AX save space */ |
| MSETL [D0FrT],A0StP,A0FrP,A0.2,A0.3 A0_4 /* Save AX regs */ |
| BNZ ___TBIJump |
| /* |
| * NextThread MUST be in TBICTX_SOFT_BIT state! |
| */ |
| $LSwitchTail: |
| MOV D0Re0,D0Ar2 /* Result from args */ |
| MOV D1Re0,D1Ar1 |
| ADD D1RtP,D1Ar1,#TBICTX_AX |
| MGETL A0StP,A0FrP,[D1RtP] /* Get frame values */ |
| $LSwitchCmn: |
| ADD A0.2,D1Ar1,#TBICTX_DX+(8*5) |
| MGETL D0.5,D0.6,D0.7,[A0.2] /* Get caller-saved DX regs */ |
| $LSwitchExit: |
| GETL D0FrT,D1RtP,[A0FrP++] /* Restore state from frame */ |
| SUB A0StP,A0FrP,#8 /* Unwind stack */ |
| MOV A0FrP,D0FrT /* Last memory read completes */ |
| MOV PC,D1RtP /* Return to caller */ |
| .size ___TBISwitch,.-___TBISwitch |
| |
| /* |
| * void __TBISyncResume( TBIRES State, int TrigMask ); |
| * |
| * This routine causes the TBICTX structure specified in State.Sig.pCtx to |
| * be restored. This implies that execution will not return to the caller. |
| * The State.Sig.TrigMask field will be ored into TXMASKI during the |
| * context switch such that any immediately occurring interrupts occur in |
| * the context of the newly specified task. The State.Sig.SaveMask parameter |
| * is ignored. |
| */ |
| .text |
| .balign 4 |
| .global ___TBISyncResume |
| .type ___TBISyncResume,function |
| ___TBISyncResume: |
| MOV D0Re0,D0Ar2 /* Result from args */ |
| MOV D1Re0,D1Ar1 |
| XOR D1Ar5,D1Ar5,D1Ar5 /* D1Ar5 = 0 */ |
| ADD D1RtP,D1Ar1,#TBICTX_AX |
| SWAP D1Ar5,TXMASKI /* D1Ar5 <-> TXMASKI */ |
| MGETL A0StP,A0FrP,[D1RtP] /* Get frame values */ |
| OR TXMASKI,D1Ar5,D1Ar3 /* New TXMASKI */ |
| B $LSwitchCmn |
| .size ___TBISyncResume,.-___TBISyncResume |
| |
| /* |
| * void __TBIJump( TBIX64 ArgsA, TBIX32 ArgsB, int TrigsMask, |
| * void (*fnMain)(), void *pStack ); |
| * |
| * Jump directly to a new routine on an arbitrary stack with arbitrary args |
| * oring bits back into TXMASKI on route. |
| */ |
| .text |
| .balign 4 |
| .global ___TBIJump |
| .type ___TBIJump,function |
| ___TBIJump: |
| XOR D0Re0,D0Re0,D0Re0 /* D0Re0 = 0 */ |
| MOV A0StP,D0Ar6 /* Stack = Frame */ |
| SWAP D0Re0,TXMASKI /* D0Re0 <-> TXMASKI */ |
| MOV A0FrP,D0Ar6 |
| MOVT A1LbP,#HI(__exit) |
| ADD A1LbP,A1LbP,#LO(__exit) |
| MOV D1RtP,A1LbP /* D1RtP = __exit */ |
| OR TXMASKI,D0Re0,D0Ar4 /* New TXMASKI */ |
| MOV PC,D1Ar5 /* Jump to fnMain */ |
| .size ___TBIJump,.-___TBIJump |
| |
| /* |
| * PTBICTX __TBISwitchInit( void *pStack, int (*fnMain)(), |
| * .... 4 extra 32-bit args .... ); |
| * |
| * Generate a new soft thread context ready for it's first outing. |
| * |
| * D1Ar1 - Region of memory to be used as the new soft thread stack |
| * D0Ar2 - Main line routine for new soft thread |
| * D1Ar3, D0Ar4, D1Ar5, D0Ar6 - arguments to be passed on stack |
| * The routine returns the initial PTBICTX value for the new thread |
| */ |
| .text |
| .balign 4 |
| .global ___TBISwitchInit |
| .type ___TBISwitchInit,function |
| ___TBISwitchInit: |
| MOV D0FrT,A0FrP /* Need save return point */ |
| ADD A0FrP,A0StP,#0 |
| SETL [A0StP++],D0FrT,D1RtP /* Save return to caller */ |
| MOVT A1LbP,#HI(__exit) |
| ADD A1LbP,A1LbP,#LO(__exit) |
| MOV D1RtP,A1LbP /* Get address of __exit */ |
| ADD D1Ar1,D1Ar1,#7 /* Align stack to 64-bits */ |
| ANDMB D1Ar1,D1Ar1,#0xfff8 /* by rounding base up */ |
| MOV A0.2,D1Ar1 /* A0.2 is new stack */ |
| MOV D0FrT,D1Ar1 /* Initial puesdo-frame pointer */ |
| SETL [A0.2++],D0FrT,D1RtP /* Save return to __exit */ |
| MOV D1RtP,D0Ar2 |
| SETL [A0.2++],D0FrT,D1RtP /* Save return to fnMain */ |
| ADD D0FrT,D0FrT,#8 /* Advance puesdo-frame pointer */ |
| MSETL [A0.2],D0Ar6,D0Ar4 /* Save extra initial args */ |
| MOVT D1RtP,#HI(___TBIStart) /* Start up code for new stack */ |
| ADD D1RtP,D1RtP,#LO(___TBIStart) |
| SETL [A0.2++],D0FrT,D1RtP /* Save return to ___TBIStart */ |
| ADD D0FrT,D0FrT,#(8*3) /* Advance puesdo-frame pointer */ |
| MOV D0Re0,A0.2 /* Return pCtx for new thread */ |
| MOV D1Re0,#0 /* pCtx:0 is default Arg1:Arg2 */ |
| /* |
| * Generate initial TBICTX state |
| */ |
| MOVT D1Ar1,#HI($LSwitchExit) /* Async restore code */ |
| ADD D1Ar1,D1Ar1,#LO($LSwitchExit) |
| MOVT D0Ar2,#TBICTX_SOFT_BIT /* Only soft thread state */ |
| ADD D0Ar6,A0.2,#TBICTX_BYTES /* New A0StP */ |
| MOV D1Ar5,A1GbP /* Same A1GbP */ |
| MOV D0Ar4,D0FrT /* Initial A0FrP */ |
| MOV D1Ar3,A1LbP /* Same A1LbP */ |
| SETL [A0.2++],D0Ar2,D1Ar1 /* Set header fields */ |
| MSETL [A0.2],D0Re0,D0Ar6,D0Ar4,D0Ar2,D0FrT,D0.5,D0.6,D0.7 |
| MOV D0Ar2,#0 /* Zero values */ |
| MOV D1Ar1,#0 |
| SETL [A0.2++],D0Ar2,D1Ar1 /* Zero CurrRPT, CurrBPOBITS, */ |
| SETL [A0.2++],D0Ar2,D1Ar1 /* CurrMODE, and pCurrCBuf */ |
| MSETL [A0.2],D0Ar6,D0Ar4,D0Ar2,D0FrT D0_5 /* Set DX and then AX regs */ |
| B $LSwitchExit /* All done! */ |
| .size ___TBISwitchInit,.-___TBISwitchInit |
| |
| .text |
| .balign 4 |
| .global ___TBIStart |
| .type ___TBIStart,function |
| ___TBIStart: |
| MOV D1Ar1,D1Re0 /* Pass TBIRES args to call */ |
| MOV D0Ar2,D0Re0 |
| MGETL D0Re0,D0Ar6,D0Ar4,[A0FrP] /* Get hidden args */ |
| SUB A0StP,A0FrP,#(8*3) /* Entry stack pointer */ |
| MOV A0FrP,D0Re0 /* Entry frame pointer */ |
| MOVT A1LbP,#HI(__exit) |
| ADD A1LbP,A1LbP,#LO(__exit) |
| MOV D1RtP,A1LbP /* D1RtP = __exit */ |
| MOV PC,D1Re0 /* Jump into fnMain */ |
| .size ___TBIStart,.-___TBIStart |
| |
| /* |
| * End of tbisoft.S |
| */ |