rhubarb-lip-sync/lib/flite-1.4/palm/arm_flite/pealstub.c

80 lines
2.8 KiB
C

/**********
* Copyright (c) 2004 Greg Parker. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY GREG PARKER ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**********/
#include "pealstub.h"
#include <stdint.h>
#include <PceNativeCall.h>
// Emulator state for calls back into 68K (set by PealArmStub)
const void *gEmulStateP = 0;
Call68KFuncType *gCall68KFuncP = 0;
// Must match struct PealArgs in m68k/peal.c
typedef struct {
void *fn;
void *arg;
void *got;
} PealArgs;
// reads unaligned and byte-swaps
#define read32(a) \
( ((((unsigned char *)(a))[0]) << 24) | \
((((unsigned char *)(a))[1]) << 16) | \
((((unsigned char *)(a))[2]) << 8) | \
((((unsigned char *)(a))[3]) << 0) )
// interfacearm attribute means PealArmStub can be called from
// non-interworking ARM code like PceNativeCall if PealArmStub is
// compiled as Thumb code.
uint32_t PealArmStub(const void *emulStateP, PealArgs *args, Call68KFuncType *call68KFuncP)
{
uint32_t (*fn)(void *);
void *arg;
register void *got asm("r10");
const void *oldEmulStateP;
Call68KFuncType *oldCall68KFuncP;
uint32_t result;
// Unpack args from PealCall() and store GOT in R10
fn = (uint32_t(*)(void *)) read32(&args->fn);
arg = (void *) read32(&args->arg);
got = (void *) read32(&args->got);
// Save old PceNativeCall values and set new ones
oldEmulStateP = gEmulStateP; gEmulStateP = emulStateP;
oldCall68KFuncP = gCall68KFuncP; gCall68KFuncP = call68KFuncP;
// Call the function
result = (*fn)(arg);
// Restore old PceNativeCall values
gEmulStateP = oldEmulStateP;
gCall68KFuncP = oldCall68KFuncP;
return result;
}