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Diffstat (limited to 'trunk/src/lib/cothread/ppc.c')
-rw-r--r--trunk/src/lib/cothread/ppc.c411
1 files changed, 411 insertions, 0 deletions
diff --git a/trunk/src/lib/cothread/ppc.c b/trunk/src/lib/cothread/ppc.c
new file mode 100644
index 00000000000..5640ad8d2cb
--- /dev/null
+++ b/trunk/src/lib/cothread/ppc.c
@@ -0,0 +1,411 @@
+/*
+ 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 (defined(__unix__) && !defined(LIBCO_PPC_ASM)) || defined(SDLMAME_MACOSX)
+
+#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 defined(_ARCH_PPC64) || defined(__PPC64__) || defined(__ppc64__) || defined(__powerpc64__)
+
+/* Whether function calls are indirect through a descriptor,
+or are directly to function */
+#ifndef LIBCO_PPCDESC
+#ifdef SDLMAME_MACOSX
+ #define LIBCO_PPCDESC 0
+#else
+ #if !defined(_CALL_SYSV) && (defined(_CALL_AIX) || defined(_CALL_AIXDESC) || defined(LIBCO_PPC64))
+ #define LIBCO_PPCDESC 1
+ #endif
+#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 );
+}