libretro/bsnes-libretro
1
0
Fork 0
mirror of https://github.com/libretro/bsnes-libretro.git synced 2024-12-04 15:46:24 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
81a87a1e01
bsnes-libretro/ppc.c
Tim Allen 7dcdaef9bd Update to v073 release. 
byuu says:

This release marks a major step forward, offering full low-level
emulation of all four DSP coprocessors based on the NEC uPD77C25
processor core. Many people were responsible for this milestone: Dr.
Decapitator for the actual decapping and extraction; Lord Nightmare for
the cartridges and some special analysis tools; myself, Jonas Quinn and
Cydrak for the uPD77C25 emulation; and all of the donors who raised the
necessary $1,000 for the necessary hardware and equipment needed to pull
this all off. To say thanks to the donors, I am releasing the uPD77C25
emulation core to the public domain, so that everyone can benefit from
it.

All four DSP emulations will be improved by this by way of having
realistic timing; the DSP-4 will benefit further as the high-level
emulation was incomplete and somewhat buggy; and the DSP-3 will benefit
the most as the high-levle emulation there was not complete enough to be
playable. As a result, most notably, this means bsnes v073 is the first
emulator to fully be able to play SD Gundam GX (J)!

As bsnes' primary goal is accuracy, the LLE DSP support renders the old
HLE DSP support obsolete. Ergo, I have removed the 166KB of HLE source
code, and replaced it with the uPD77C25 core, which comprises a mere
20KB of source code. As this LLE module supports save states, this also
means that for the first time, DSP-3 and DSP-4 games have save state
support.

On the other hand, this also means that to run any DSP game, you will
need the appropriate program ROM. As these are copyrighted, I cannot
distribute them nor tell you where to get them. All I can do is provide
you with the necessary filenames and hashes.

Changelog (since v072 release):
* added NEC uPD77C25 emulation core
* added low-level emulation of the DSP-1, DSP-1B, DSP-2, DSP-3, DSP-4
  coprocessors
* removed high-level emulation of the DSP-n coprocessors
* added blargg's libco::ppc.c module, which is far more portable, even
  running on the PS3
* added software filter support via binary plugins
* added debugger (currently Linux-only); but it is as yet unstable
* added pause shortcut
* updated mightymo's cheat code database
2010-12-26 23:24:34 +11:00

408 lines
12 KiB
C
Raw Blame History

/*
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 "libco.h"
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#define LIBCO_MPROTECT (__unix__ && !LIBCO_PPC_ASM)
#if LIBCO_MPROTECT
#include <unistd.h>
#include <sys/mman.h>
#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()
{
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 );
}
Reference in New Issue View Git Blame Copy Permalink