diff options
Diffstat (limited to 'ext/systemc/src/sysc/qt/md/powerpc_mach.s')
| -rw-r--r-- | ext/systemc/src/sysc/qt/md/powerpc_mach.s | 641 |
1 files changed, 641 insertions, 0 deletions
diff --git a/ext/systemc/src/sysc/qt/md/powerpc_mach.s b/ext/systemc/src/sysc/qt/md/powerpc_mach.s new file mode 100644 index 000000000..63414b05d --- /dev/null +++ b/ext/systemc/src/sysc/qt/md/powerpc_mach.s @@ -0,0 +1,641 @@ +/* powerpc_mach.s -- assembly support. */ + +/* + * QuickThreads -- Threads-building toolkit. + * Copyright (c) 1993 by David Keppel + * + * Permission to use, copy, modify and distribute this software and + * its documentation for any purpose and without fee is hereby + * granted, provided that the above copyright notice and this notice + * appear in all copies. This software is provided as a + * proof-of-concept and for demonstration purposes; there is no + * representation about the suitability of this software for any + * purpose. + + + * PowerPC-Mach thread switching module. + * Darwin (MacOS X) assembly + * + * NOTICE: Syntax for register names is not the GNU one. Register are + * named "rx" and "fx", not "%rx" and "%fx" as usual for the GNU "as" tool. + * Darwin "as" tool is based on GNU "as" but follows the "official" PowerPC + * syntax. + * + * + * This software is largely based on the original PowerPC-Linux porting + * developed by Ken Aaker <kenaaker@silverbacksystems.com> + * + * Marco Bucci <marco.bucci@inwind.it> + * December 2002 + * + */ + + +/* + * + * PowerPC Register convections: + * + * r0 volatile + * r1 SP + * r2 system reserved + * r3-r4 volatile for parameter passing and function return + * r5-r10 volatile for parameter passing + * r11-r12 volatile + * r13-r14 non volatile registers + * f0 volatile + * f1 volatile for parameter passing and function return + * f2-f13 volatile for parameter passing + * f14-f31 non volatile + * + * cr2-cr4 non volatile + * + * + * See on the heather file for more documentation. + * + * + * + * IMPLEMENTATION NOTES + * + * + * 1) Condition register saving + * On most machines, the condition code register is caller-save. + * On the PPC, the condition code register is callee-save, so the + * thread context switch must preserve it. + * + * + * 2) Floating point registers saving + * On resuming a thread, floating point registers are or not restored just + * depending on which block routine suspended the thread (i.e. regardless + * whether "qt_block", "qt_blocki" or "qt_abort" is used to resume it). + * This behaviour is obtained by implementing "qt_block" by means af a nested + * call to "qt_blocki". As a result, the blocking of a thread always goes + * and returns through "qt_blocki and, if a thread was blocked by "qt_block", + * its execution resumes from the floating point restoring code on exit + * of "qt_block". + * + * Thanks to David Keppel that explained me this "simple" trick. + * + * + * 3) C languace code debugging + * This software was developed and debugged using the Metrowerks + * Code Warrior PPC integrated assembler. It can be still used with the + * Code Warrior compiler by means of the file "powerpc_mach_asm_debug.c" + * that include it. + * In order to avoid "copy and paste" bugs, and make easyer the maintaining, + * I made the minimal changes, so you can find some strange code as: + * + * #if 0 + * .if 0 + * C code here + * .endif + * #endif + * + * This is just to embed some C code that is needed by the Code Warrior + * integrated assembler. + * + * + * 4) Assembly constants generation + * Constants used in the assembly code are generated by running + * the C code in the sequel (commented). It uses the C macros declared in + * the C heather in order to guarantee that the C interface and the assebly + * code are "aligned". I avoided the use of an assebler preprocessor since + * they are not so standard and moreover using macro espressions makes the + * assembly debugging more difficult. + * + * + + +#include <iostream> +#include "powerpc_mach.h" + +int main() +{ + using namespace std; + + int i; + + cout << ".set LR_SAVE, " << PPC_LR_SAVE << endl; + cout << ".set CR_SAVE, " << PPC_CR_SAVE << endl; + cout << ".set BLOCKI_FSIZE, " << QUICKTHREADS_BLOCKI_FRAME_SIZE << endl; + cout << ".set BLOCK_FSIZE, " << QUICKTHREADS_BLOCK_FRAME_SIZE << endl; + + cout << endl; + for(i=0; i<12; i++) + cout << ".set PAR_" << i << ", " << PPC_PAR(i) << endl; + + cout << endl; + i = 13; + cout << ".set GPR_SAVE_" << i << ", " << QUICKTHREADS_BLOCKI_GPR_SAVE(i) << endl; + + cout << endl; + for(i=31; i>13; i--) + cout << ".set FPR_SAVE_" << i << ", " << QUICKTHREADS_BLOCK_FPR_SAVE(i) << endl; + + cout << endl; + cout << ".set VARGS_BKOFF, " << QUICKTHREADS_VARGS_BKOFF << endl; + + + cout << endl << endl << endl; + + for(i=31; i>13; i--) + cout << "\tstfd\tf" << i << ",FPR_SAVE_" << i << "(r1)" << endl; + + cout << endl; + for(i=31; i>13; i--) + cout << "\tlfd \tf" << i << ",FPR_SAVE_" << i << "(r1)" << endl; + + cout << endl << endl << endl; + + + return 0; +} + + + * + * + * + */ + + +#if 0 + + .text + .align 4 + + .globl qt_block + .globl _qt_block + .globl qt_blocki + .globl _qt_blocki + .globl qt_abort + .globl _qt_abort + .globl qt_start + .globl _qt_start + .globl qt_vstart + .globl _qt_vstart + + +.set LR_SAVE, 8 +.set CR_SAVE, 4 +.set BLOCKI_FSIZE, 128 +.set BLOCK_FSIZE, 192 + +.set PAR_0, 24 +.set PAR_1, 28 +.set PAR_2, 32 +.set PAR_3, 36 +.set PAR_4, 40 +.set PAR_5, 44 +.set PAR_6, 48 +.set PAR_7, 52 +.set PAR_8, 56 +.set PAR_9, 60 +.set PAR_10, 64 +.set PAR_11, 68 + +.set GPR_SAVE_13, 52 + +.set FPR_SAVE_31, 184 +.set FPR_SAVE_30, 176 +.set FPR_SAVE_29, 168 +.set FPR_SAVE_28, 160 +.set FPR_SAVE_27, 152 +.set FPR_SAVE_26, 144 +.set FPR_SAVE_25, 136 +.set FPR_SAVE_24, 128 +.set FPR_SAVE_23, 120 +.set FPR_SAVE_22, 112 +.set FPR_SAVE_21, 104 +.set FPR_SAVE_20, 96 +.set FPR_SAVE_19, 88 +.set FPR_SAVE_18, 80 +.set FPR_SAVE_17, 72 +.set FPR_SAVE_16, 64 +.set FPR_SAVE_15, 56 +.set FPR_SAVE_14, 48 + + +/* various offsets used by "qt_varg" */ +.set P_T, PAR_0 +.set P_STARTUP, PAR_1 +.set P_USERF, PAR_2 +.set P_CLEANUP, PAR_3 + /* the offset used to move back the linkage area to be adiacent to + * the variant argument list before calling "userf(...) */ +.set VARGS_BKOFF, 16 /* skip "t", "startup", "userf" and "cleanup" */ + + /* location where "t" and "cleanup" are saved (with respect of + * the stack frame base) */ +.set P_T_SAVE, -4 +.set P_CLEANUP_SAVE, -8 + +#endif + + + +/* Block the current thread saving all integer non volatile registers and + * start a new thread. + */ +#if 0 +.if 0 +#endif +void *qt_blocki (void *helper, void *a0, void *a1, void *newthread); +asm void *qt_blocki (void *helper, void *a0, void *a1, void *newthread) +{ +#if 0 +.endif +#endif + +#if 0 +qt_blocki: +_qt_blocki: +#endif +/* prolog code */ + stwu r1,-BLOCKI_FSIZE(r1) /* allocate the stack frame */ + mflr r0 /* return addr in r0 */ + mfcr r11 /* CR in r11 */ + stw r0,LR_SAVE+BLOCKI_FSIZE(r1) /* save return addr in the stack */ + stw r11,CR_SAVE+BLOCKI_FSIZE(r1) /* save CR in the stack */ + stmw r13,GPR_SAVE_13(r1) /* save non-volatile reg */ + +/* call helper(qt_t *old, void *a0, void *a1) */ + mtlr r3 /* "helper" addr in the link reg */ + mr r3,r1 /* current thread (i.e. the SP) in arg "old" */ + mr r1,r6 /* swap to the new thread (i.e. to its SP) */ + blrl /* jump to "helper" */ +/* the "helper" return value is returned (since r3 is not changed) */ + +/* epilog code: return to the new thread's "qt_blocki" caller */ + lmw r13,GPR_SAVE_13(r1) /* restore non-volatile reg */ + lwz r0,LR_SAVE+BLOCKI_FSIZE(r1) /* recover return addr */ + lwz r11,CR_SAVE+BLOCKI_FSIZE(r1) /* recover CR */ + mtlr r0 /* return address in the link reg */ + mtcr r11 /* restore CR */ + addi r1,r1,BLOCKI_FSIZE /* free the stack frame */ + blr /* return */ + +#if 0 +.if 0 +#endif +} +#if 0 +.endif +#endif + + + +/* Abort the current thread and start a new thread. + */ +#if 0 +.if 0 +#endif +void qt_abort (void *helper, void *a0, void *a1, void *newthread); +asm void qt_abort (void *helper, void *a0, void *a1, void *newthread) +{ +#if 0 +.endif +#endif + +#if 0 +qt_abort: +_qt_abort: +#endif +/* prolog code */ +/* there is no prolog. It will never come back */ + +/* call helper(qt_t *old, void *a0, void *a1) */ + mtlr r3 /* "helper" addr in the link reg */ + mr r1,r6 /* swap to the new thread (i.e. to its SP) */ +/* we don't need to set "old", we can pass just garbage. Actually, since r3 + is not changed, "old" is set to "helper" (don't care) */ + blrl /* call "helper" */ +/* the "helper" return value is returned (since r3 is not changed) */ + +/* epilog code: return to the new thread's "qt_blocki" caller */ + lmw r13,GPR_SAVE_13(r1) /* restore non-volatile reg */ + lwz r0,LR_SAVE+BLOCKI_FSIZE(r1) /* recover return addr */ + lwz r11,CR_SAVE+BLOCKI_FSIZE(r1) /* recover CR */ + mtlr r0 /* return address in the link reg */ + mtcr r11 /* restore CR */ + addi r1,r1,BLOCKI_FSIZE /* free the stack frame */ + blr /* return */ + +#if 0 +.if 0 +#endif +} +#if 0 +.endif +#endif + + + +/* Block the current thread saving all non volatile registers and start + * a new thread. + */ +#if 0 +.if 0 +#endif +void *qt_block (void *helper, void *a0, void *a1, void *newthread); +asm void *qt_block (void *helper, void *a0, void *a1, void *newthread) +{ +#if 0 +.endif +#endif + +# if 0 +qt_block: +_qt_block: +#endif +/* prolog code */ + stwu r1,-BLOCK_FSIZE(r1) /* allocate the stack frame */ + mflr r0 /* return addr in r0 */ + stw r0,LR_SAVE+BLOCK_FSIZE(r1) /* save return addr in the stack */ + +/* save non-volatile fp reg */ + stfd f31,FPR_SAVE_31(r1) + stfd f30,FPR_SAVE_30(r1) + stfd f29,FPR_SAVE_29(r1) + stfd f28,FPR_SAVE_28(r1) + stfd f27,FPR_SAVE_27(r1) + stfd f26,FPR_SAVE_26(r1) + stfd f25,FPR_SAVE_25(r1) + stfd f24,FPR_SAVE_24(r1) + stfd f23,FPR_SAVE_23(r1) + stfd f22,FPR_SAVE_22(r1) + stfd f21,FPR_SAVE_21(r1) + stfd f20,FPR_SAVE_20(r1) + stfd f19,FPR_SAVE_19(r1) + stfd f18,FPR_SAVE_18(r1) + stfd f17,FPR_SAVE_17(r1) + stfd f16,FPR_SAVE_16(r1) + stfd f15,FPR_SAVE_15(r1) + stfd f14,FPR_SAVE_14(r1) +/* block the thread */ + bl qt_blocki +/* the thread is going to be resumed */ +/* restore non-volatile fp reg */ + lfd f31,FPR_SAVE_31(r1) + lfd f30,FPR_SAVE_30(r1) + lfd f29,FPR_SAVE_29(r1) + lfd f28,FPR_SAVE_28(r1) + lfd f27,FPR_SAVE_27(r1) + lfd f26,FPR_SAVE_26(r1) + lfd f25,FPR_SAVE_25(r1) + lfd f24,FPR_SAVE_24(r1) + lfd f23,FPR_SAVE_23(r1) + lfd f22,FPR_SAVE_22(r1) + lfd f21,FPR_SAVE_21(r1) + lfd f20,FPR_SAVE_20(r1) + lfd f19,FPR_SAVE_19(r1) + lfd f18,FPR_SAVE_18(r1) + lfd f17,FPR_SAVE_17(r1) + lfd f16,FPR_SAVE_16(r1) + lfd f15,FPR_SAVE_15(r1) + lfd f14,FPR_SAVE_14(r1) + + lwz r0,LR_SAVE+BLOCK_FSIZE(r1) /* recover return addr */ + mtlr r0 /* return address in the link reg */ + addi r1,r1,BLOCK_FSIZE /* free the stack frame */ + blr /* return */ + +#if 0 +.if 0 +#endif +} +#if 0 +.endif +#endif + + + +/* Start a single argument thread using parameters preloaded in the stack + * during thread initialization (see comments on stack initialization in the + * heather file). + * + * Executes: + * + * only(u, t, userf); + */ +#if 0 +.if 0 +#endif +void qt_start(void); +asm void qt_start(void) +{ +#if 0 +.endif +#endif + +#if 0 +qt_start: +_qt_start: +#endif + lwz r3,PAR_0(r1) /* "u" in r3 */ + lwz r4,PAR_1(r1) /* "t" in r4 */ + lwz r5,PAR_2(r1) /* "userf" in r5 */ + lwz r6,PAR_3(r1) /* "only" in r6 */ + mtlr r6 /* "only" address in the link reg */ +/* call only(u, t, userf) */ + blrl /* jump to "only" */ +/* error if it returns */ + b _qt_error +/* dead code (some inline asm "wants" the epilog, or they genetare it) */ + blr + +#if 0 +.if 0 +#endif +} +#if 0 +.endif +#endif + + + +/* Start a variant argument thread using parameters preloaded in the stack + * during thread initialization (see comments on stack initialization in the + * heather file). + * + * Executes: + * + * startup(t); + * userf_return = userf(...); + * cleanup(pt, userf_return); + * + + + ***** Stack layout on start ***** + + + backchain -> STACK BOTTOM (higher address) + +==========================+ + backchain - 4 -> | | + + LOCAL VARIABLES AREA + + .............. + + + + | | + +--------------------------+ + | | + + ALIGNMEBNT PAD + + .............. + + (if needed) + + | | + +--------------------------+ + | | arg(n) + + + + | | + + VARIABLE ARGUMENT LIST + + .............. + + for userf call + + SP + PAR(5) -> | | arg(1) + + + + SP + PAR(4) -> | | arg(0) + +--------------------------+ + SP + PAR(3) -> | | cleanup par + + + + SP + PAR(2) -> | | userf par + + PARAMETER AREA + + SP + PAR(1) -> | | startup par + + + + SP + PAR(0) -> | | t par + +--------------------------+ + | | + + LINKAGE AREA + + SP -> | | + +==========================+ + STACK TOP (lower address) + + Stack grows down + | + V + + + + ***** Stack layout before call userf ***** + + + backchain -> STACK BOTTOM (higher address) + +==========================+ + backchain - 4 -> | | + + LOCAL VARIABLES AREA + + .............. + + + + | | + +--------------------------+ + | | + + ALIGNMEBNT PAD + + .............. + + (if needed) + + | | + +--------------------------+ + | | arg(n) + + + + | | + + VARIABLE ARGUMENT LIST + + .............. + + for userf call + + SP + PAR(1) -> | | arg(1) + + + + SP + PAR(0) -> | | arg(0) + +--------------------------+ + | | + + LINKAGE AREA + + SP -> | | + +==========================+ + STACK TOP (lower address) + + Stack grows down + | + V + + + * To call "userf(...)", the argument list must be adiacent to the linkage + * area. Instead of copy the argument list, we move back the linkage area + * (actually, we just increase the SP and copy the backchain). "t" and + * "cleanup" are saved in a local variable area in order to call + * cleanup(pt, userf_return). + +*/ + + +#if 0 +.if 0 +#endif +void qt_vstart(void); +asm void qt_vstart(void) +{ +#if 0 +.endif +#endif + +#if 0 +qt_vstart: +_qt_vstart: +#endif +/* NOTICE: the callee routines could save parameter registers in the caller's + * stack parameter area. We put "t" in PAR(0) in such a way, if startup(t) + * will save "t", it will be saved on the same location thus not delething + * any other parameter. + */ + +/* since we will move back the linckage area (to make it adiacent to the + * parameter list), we need to save "t" and "cleanup". We have made room for + * this on the bottom of the stack frame. */ + +/* save parameters in the local variable area */ + lwz r11,0(r1) /* get the backchain */ + lwz r3,P_T(r1) + lwz r4,P_CLEANUP(r1) + stw r3,P_T_SAVE(r11) /* save "pt" */ + stw r4,P_CLEANUP_SAVE(r11) /* save "cleanup" */ + +/* call startup(t) */ + lwz r5,P_STARTUP(r1) + mtlr r5 + blrl /* call "startup" */ + +/* call userf(...) */ + lwz r11,0(r1) /* reload backchain (r11 is volatile) */ + lwz r4,P_USERF(r1) /* load "userf" */ + mtlr r4 + + /* first eight parameter of the variant list must be copyed in + * GPR3-GPR10. There is a four places offset due to "t", "startup", + * userf" and "cleanup" */ + + lwz r3,PAR_4(r1) + lwz r4,PAR_5(r1) + lwz r5,PAR_6(r1) + lwz r6,PAR_7(r1) + lwz r7,PAR_8(r1) + lwz r8,PAR_9(r1) + lwz r9,PAR_10(r1) + lwz r10,PAR_11(r1) + + + /* move the linkage area to be adiacent to the argument list */ + stw r11,VARGS_BKOFF(r1) /* copy backchain */ + addi r1,r1,VARGS_BKOFF /* move back the stack */ + + blrl /* call "userf" */ + +/* call qt_cleanup(void *pt, void *vuserf_return) */ + lwz r11,0(r1) /* reload backchain (r11 is volatile) */ + + mr r4,r3 /* push "userf" return as 2nd parameter */ + lwz r3,P_T_SAVE(r11) /* reload "pt" */ + lwz r5,P_CLEANUP_SAVE(r11) /* reload "cleanup" */ + mtlr r5 + blrl + b _qt_error +/* dead code (some inline asm "wanst" the epilog, or they genetare it) */ + blr + +#if 0 +.if 0 +#endif +} +#if 0 +.endif +#endif + |