From 365077772d3d8d5d479febd0388d7e74ef08d508 Mon Sep 17 00:00:00 2001 From: aliaspider Date: Mon, 8 Dec 2014 22:56:33 +0100 Subject: start implementing the libretro interface. (not working yet) --- libco/ppc.c | 407 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 407 insertions(+) create mode 100644 libco/ppc.c (limited to 'libco/ppc.c') diff --git a/libco/ppc.c b/libco/ppc.c new file mode 100644 index 0000000..f6cb536 --- /dev/null +++ b/libco/ppc.c @@ -0,0 +1,407 @@ +/* + libco.ppc (2010-10-17) + author: blargg + license: public domain +*/ + +/* PowerPC 32/64 using embedded or external asm, with optional +floating-point and AltiVec save/restore */ + +#define LIBCO_C +#include +#include +#include +#include + +#define LIBCO_MPROTECT (__unix__ && !LIBCO_PPC_ASM) + +#if LIBCO_MPROTECT + #include + #include +#endif + +/* State format (offsets in 32-bit words) + ++0 Pointer to swap code + Rest of function descriptor for entry function ++8 PC ++10 SP + Special regs + GPRs + FPRs + VRs + stack +*/ + +enum { state_size = 1024 }; +enum { above_stack = 2048 }; +enum { stack_align = 256 }; + +static thread_local cothread_t co_active_handle = 0; + +/**** Determine environment ****/ + +#define LIBCO_PPC64 (_ARCH_PPC64 || __PPC64__ || __ppc64__ || __powerpc64__) + +/* Whether function calls are indirect through a descriptor, +or are directly to function */ +#ifndef LIBCO_PPCDESC + #if !_CALL_SYSV && (_CALL_AIX || _CALL_AIXDESC || LIBCO_PPC64) + #define LIBCO_PPCDESC 1 + #endif +#endif + +#ifdef LIBCO_PPC_ASM + + #ifdef __cplusplus + extern "C" + #endif + + /* Swap code is in ppc.S */ + void co_swap_asm( cothread_t, cothread_t ); + #define CO_SWAP_ASM( x, y ) co_swap_asm( x, y ) + +#else + +/* Swap code is here in array. Please leave dieassembly comments, +as they make it easy to see what it does, and reorder instructions +if one wants to see whether that improves performance. */ +static const uint32_t libco_ppc_code [] = { +#if LIBCO_PPC64 + 0x7d000026, /* mfcr r8 */ + 0xf8240028, /* std r1,40(r4) */ + 0x7d2802a6, /* mflr r9 */ + 0xf9c40048, /* std r14,72(r4) */ + 0xf9e40050, /* std r15,80(r4) */ + 0xfa040058, /* std r16,88(r4) */ + 0xfa240060, /* std r17,96(r4) */ + 0xfa440068, /* std r18,104(r4) */ + 0xfa640070, /* std r19,112(r4) */ + 0xfa840078, /* std r20,120(r4) */ + 0xfaa40080, /* std r21,128(r4) */ + 0xfac40088, /* std r22,136(r4) */ + 0xfae40090, /* std r23,144(r4) */ + 0xfb040098, /* std r24,152(r4) */ + 0xfb2400a0, /* std r25,160(r4) */ + 0xfb4400a8, /* std r26,168(r4) */ + 0xfb6400b0, /* std r27,176(r4) */ + 0xfb8400b8, /* std r28,184(r4) */ + 0xfba400c0, /* std r29,192(r4) */ + 0xfbc400c8, /* std r30,200(r4) */ + 0xfbe400d0, /* std r31,208(r4) */ + 0xf9240020, /* std r9,32(r4) */ + 0xe8e30020, /* ld r7,32(r3) */ + 0xe8230028, /* ld r1,40(r3) */ + 0x48000009, /* bl 1 */ + 0x7fe00008, /* trap */ + 0x91040030,/*1:stw r8,48(r4) */ + 0x80c30030, /* lwz r6,48(r3) */ + 0x7ce903a6, /* mtctr r7 */ + 0xe9c30048, /* ld r14,72(r3) */ + 0xe9e30050, /* ld r15,80(r3) */ + 0xea030058, /* ld r16,88(r3) */ + 0xea230060, /* ld r17,96(r3) */ + 0xea430068, /* ld r18,104(r3) */ + 0xea630070, /* ld r19,112(r3) */ + 0xea830078, /* ld r20,120(r3) */ + 0xeaa30080, /* ld r21,128(r3) */ + 0xeac30088, /* ld r22,136(r3) */ + 0xeae30090, /* ld r23,144(r3) */ + 0xeb030098, /* ld r24,152(r3) */ + 0xeb2300a0, /* ld r25,160(r3) */ + 0xeb4300a8, /* ld r26,168(r3) */ + 0xeb6300b0, /* ld r27,176(r3) */ + 0xeb8300b8, /* ld r28,184(r3) */ + 0xeba300c0, /* ld r29,192(r3) */ + 0xebc300c8, /* ld r30,200(r3) */ + 0xebe300d0, /* ld r31,208(r3) */ + 0x7ccff120, /* mtcr r6 */ +#else + 0x7d000026, /* mfcr r8 */ + 0x90240028, /* stw r1,40(r4) */ + 0x7d2802a6, /* mflr r9 */ + 0x91a4003c, /* stw r13,60(r4) */ + 0x91c40040, /* stw r14,64(r4) */ + 0x91e40044, /* stw r15,68(r4) */ + 0x92040048, /* stw r16,72(r4) */ + 0x9224004c, /* stw r17,76(r4) */ + 0x92440050, /* stw r18,80(r4) */ + 0x92640054, /* stw r19,84(r4) */ + 0x92840058, /* stw r20,88(r4) */ + 0x92a4005c, /* stw r21,92(r4) */ + 0x92c40060, /* stw r22,96(r4) */ + 0x92e40064, /* stw r23,100(r4) */ + 0x93040068, /* stw r24,104(r4) */ + 0x9324006c, /* stw r25,108(r4) */ + 0x93440070, /* stw r26,112(r4) */ + 0x93640074, /* stw r27,116(r4) */ + 0x93840078, /* stw r28,120(r4) */ + 0x93a4007c, /* stw r29,124(r4) */ + 0x93c40080, /* stw r30,128(r4) */ + 0x93e40084, /* stw r31,132(r4) */ + 0x91240020, /* stw r9,32(r4) */ + 0x80e30020, /* lwz r7,32(r3) */ + 0x80230028, /* lwz r1,40(r3) */ + 0x48000009, /* bl 1 */ + 0x7fe00008, /* trap */ + 0x91040030,/*1:stw r8,48(r4) */ + 0x80c30030, /* lwz r6,48(r3) */ + 0x7ce903a6, /* mtctr r7 */ + 0x81a3003c, /* lwz r13,60(r3) */ + 0x81c30040, /* lwz r14,64(r3) */ + 0x81e30044, /* lwz r15,68(r3) */ + 0x82030048, /* lwz r16,72(r3) */ + 0x8223004c, /* lwz r17,76(r3) */ + 0x82430050, /* lwz r18,80(r3) */ + 0x82630054, /* lwz r19,84(r3) */ + 0x82830058, /* lwz r20,88(r3) */ + 0x82a3005c, /* lwz r21,92(r3) */ + 0x82c30060, /* lwz r22,96(r3) */ + 0x82e30064, /* lwz r23,100(r3) */ + 0x83030068, /* lwz r24,104(r3) */ + 0x8323006c, /* lwz r25,108(r3) */ + 0x83430070, /* lwz r26,112(r3) */ + 0x83630074, /* lwz r27,116(r3) */ + 0x83830078, /* lwz r28,120(r3) */ + 0x83a3007c, /* lwz r29,124(r3) */ + 0x83c30080, /* lwz r30,128(r3) */ + 0x83e30084, /* lwz r31,132(r3) */ + 0x7ccff120, /* mtcr r6 */ +#endif + +#ifndef LIBCO_PPC_NOFP + 0xd9c400e0, /* stfd f14,224(r4) */ + 0xd9e400e8, /* stfd f15,232(r4) */ + 0xda0400f0, /* stfd f16,240(r4) */ + 0xda2400f8, /* stfd f17,248(r4) */ + 0xda440100, /* stfd f18,256(r4) */ + 0xda640108, /* stfd f19,264(r4) */ + 0xda840110, /* stfd f20,272(r4) */ + 0xdaa40118, /* stfd f21,280(r4) */ + 0xdac40120, /* stfd f22,288(r4) */ + 0xdae40128, /* stfd f23,296(r4) */ + 0xdb040130, /* stfd f24,304(r4) */ + 0xdb240138, /* stfd f25,312(r4) */ + 0xdb440140, /* stfd f26,320(r4) */ + 0xdb640148, /* stfd f27,328(r4) */ + 0xdb840150, /* stfd f28,336(r4) */ + 0xdba40158, /* stfd f29,344(r4) */ + 0xdbc40160, /* stfd f30,352(r4) */ + 0xdbe40168, /* stfd f31,360(r4) */ + 0xc9c300e0, /* lfd f14,224(r3) */ + 0xc9e300e8, /* lfd f15,232(r3) */ + 0xca0300f0, /* lfd f16,240(r3) */ + 0xca2300f8, /* lfd f17,248(r3) */ + 0xca430100, /* lfd f18,256(r3) */ + 0xca630108, /* lfd f19,264(r3) */ + 0xca830110, /* lfd f20,272(r3) */ + 0xcaa30118, /* lfd f21,280(r3) */ + 0xcac30120, /* lfd f22,288(r3) */ + 0xcae30128, /* lfd f23,296(r3) */ + 0xcb030130, /* lfd f24,304(r3) */ + 0xcb230138, /* lfd f25,312(r3) */ + 0xcb430140, /* lfd f26,320(r3) */ + 0xcb630148, /* lfd f27,328(r3) */ + 0xcb830150, /* lfd f28,336(r3) */ + 0xcba30158, /* lfd f29,344(r3) */ + 0xcbc30160, /* lfd f30,352(r3) */ + 0xcbe30168, /* lfd f31,360(r3) */ +#endif + +#ifdef __ALTIVEC__ + 0x7ca042a6, /* mfvrsave r5 */ + 0x39040180, /* addi r8,r4,384 */ + 0x39240190, /* addi r9,r4,400 */ + 0x70a00fff, /* andi. r0,r5,4095 */ + 0x90a40034, /* stw r5,52(r4) */ + 0x4182005c, /* beq- 2 */ + 0x7e8041ce, /* stvx v20,r0,r8 */ + 0x39080020, /* addi r8,r8,32 */ + 0x7ea049ce, /* stvx v21,r0,r9 */ + 0x39290020, /* addi r9,r9,32 */ + 0x7ec041ce, /* stvx v22,r0,r8 */ + 0x39080020, /* addi r8,r8,32 */ + 0x7ee049ce, /* stvx v23,r0,r9 */ + 0x39290020, /* addi r9,r9,32 */ + 0x7f0041ce, /* stvx v24,r0,r8 */ + 0x39080020, /* addi r8,r8,32 */ + 0x7f2049ce, /* stvx v25,r0,r9 */ + 0x39290020, /* addi r9,r9,32 */ + 0x7f4041ce, /* stvx v26,r0,r8 */ + 0x39080020, /* addi r8,r8,32 */ + 0x7f6049ce, /* stvx v27,r0,r9 */ + 0x39290020, /* addi r9,r9,32 */ + 0x7f8041ce, /* stvx v28,r0,r8 */ + 0x39080020, /* addi r8,r8,32 */ + 0x7fa049ce, /* stvx v29,r0,r9 */ + 0x39290020, /* addi r9,r9,32 */ + 0x7fc041ce, /* stvx v30,r0,r8 */ + 0x7fe049ce, /* stvx v31,r0,r9 */ + 0x80a30034,/*2:lwz r5,52(r3) */ + 0x39030180, /* addi r8,r3,384 */ + 0x39230190, /* addi r9,r3,400 */ + 0x70a00fff, /* andi. r0,r5,4095 */ + 0x7ca043a6, /* mtvrsave r5 */ + 0x4d820420, /* beqctr */ + 0x7e8040ce, /* lvx v20,r0,r8 */ + 0x39080020, /* addi r8,r8,32 */ + 0x7ea048ce, /* lvx v21,r0,r9 */ + 0x39290020, /* addi r9,r9,32 */ + 0x7ec040ce, /* lvx v22,r0,r8 */ + 0x39080020, /* addi r8,r8,32 */ + 0x7ee048ce, /* lvx v23,r0,r9 */ + 0x39290020, /* addi r9,r9,32 */ + 0x7f0040ce, /* lvx v24,r0,r8 */ + 0x39080020, /* addi r8,r8,32 */ + 0x7f2048ce, /* lvx v25,r0,r9 */ + 0x39290020, /* addi r9,r9,32 */ + 0x7f4040ce, /* lvx v26,r0,r8 */ + 0x39080020, /* addi r8,r8,32 */ + 0x7f6048ce, /* lvx v27,r0,r9 */ + 0x39290020, /* addi r9,r9,32 */ + 0x7f8040ce, /* lvx v28,r0,r8 */ + 0x39080020, /* addi r8,r8,32 */ + 0x7fa048ce, /* lvx v29,r0,r9 */ + 0x39290020, /* addi r9,r9,32 */ + 0x7fc040ce, /* lvx v30,r0,r8 */ + 0x7fe048ce, /* lvx v31,r0,r9 */ +#endif + + 0x4e800420, /* bctr */ +}; + + #if LIBCO_PPCDESC + /* Function call goes through indirect descriptor */ + #define CO_SWAP_ASM( x, y ) \ + ((void (*)( cothread_t, cothread_t )) (uintptr_t) x)( x, y ) + #else + /* Function call goes directly to code */ + #define CO_SWAP_ASM( x, y ) \ + ((void (*)( cothread_t, cothread_t )) (uintptr_t) libco_ppc_code)( x, y ) + #endif + +#endif + +static uint32_t* co_create_( unsigned size, uintptr_t entry ) +{ + uint32_t* t = (uint32_t*) malloc( size ); + + (void) entry; + + #if LIBCO_PPCDESC + if ( t ) + { + /* Copy entry's descriptor */ + memcpy( t, (void*) entry, sizeof (void*) * 3 ); + + /* Set function pointer to swap routine */ + #ifdef LIBCO_PPC_ASM + *(const void**) t = *(void**) &co_swap_asm; + #else + *(const void**) t = libco_ppc_code; + #endif + } + #endif + + return t; +} + +cothread_t co_create( unsigned int size, void (*entry_)( void ) ) +{ + uintptr_t entry = (uintptr_t) entry_; + uint32_t* t = NULL; + + /* Be sure main thread was successfully allocated */ + if ( co_active() ) + { + size += state_size + above_stack + stack_align; + t = co_create_( size, entry ); + } + + if ( t ) + { + uintptr_t sp; + int shift; + + /* Save current registers into new thread, so that any special ones will + have proper values when thread is begun */ + CO_SWAP_ASM( t, t ); + + #if LIBCO_PPCDESC + /* Get real address */ + entry = (uintptr_t) *(void**) entry; + #endif + + /* Put stack near end of block, and align */ + sp = (uintptr_t) t + size - above_stack; + sp -= sp % stack_align; + + /* On PPC32, we save and restore GPRs as 32 bits. For PPC64, we + save and restore them as 64 bits, regardless of the size the ABI + uses. So, we manually write pointers at the proper size. We always + save and restore at the same address, and since PPC is big-endian, + we must put the low byte first on PPC32. */ + + /* If uintptr_t is 32 bits, >>32 is undefined behavior, so we do two shifts + and don't have to care how many bits uintptr_t is. */ + #if LIBCO_PPC64 + shift = 16; + #else + shift = 0; + #endif + + /* Set up so entry will be called on next swap */ + t [8] = (uint32_t) (entry >> shift >> shift); + t [9] = (uint32_t) entry; + + t [10] = (uint32_t) (sp >> shift >> shift); + t [11] = (uint32_t) sp; + } + + return t; +} + +void co_delete( cothread_t t ) +{ + free(t); +} + +static void co_init_( void ) +{ +#if LIBCO_MPROTECT + /* TODO: pre- and post-pad PPC code so that this doesn't make other + data executable and writable */ + long page_size = sysconf( _SC_PAGESIZE ); + if ( page_size > 0 ) + { + uintptr_t align = page_size; + uintptr_t begin = (uintptr_t) libco_ppc_code; + uintptr_t end = begin + sizeof libco_ppc_code; + + /* Align beginning and end */ + end += align - 1; + end -= end % align; + begin -= begin % align; + + mprotect( (void*) begin, end - begin, PROT_READ | PROT_WRITE | PROT_EXEC ); + } +#endif + + co_active_handle = co_create_( state_size, (uintptr_t) &co_switch ); +} + +cothread_t co_active(void) +{ + if (!co_active_handle) + co_init_(); + + return co_active_handle; +} + +void co_switch(cothread_t t) +{ + cothread_t old = co_active_handle; + co_active_handle = t; + + CO_SWAP_ASM( t, old ); +} -- cgit v1.2.3