1 files changed, 162 insertions, 0 deletions
diff --git a/lib/mips.cpp b/lib/mips.cpp
new file mode 100644
index 0000000..4956b9e
--- /dev/null
+++ b/lib/mips.cpp
@@ -0,0 +1,162 @@
+#include "mips.h"
+
+Uint8 mips::Read8(Uint32 mem) {
+    if ((mem < 0x80000000) || (mem >= 0x80200000)) {
+	printm(M_WARNING, "Reading at out of bound of memory: 0x%08x\n", mem);
+	return 0;
+    }
+    
+    mem -= 0x80000000;
+
+    if (IsPatched(mem)) {
+	return patches[mem];
+    } else {
+	return plainmemory[mem];
+    }
+}
+
+Uint16 mips::Read16(Uint32 mem) {
+    Uint8 a, b;
+    
+    if (mem & 1) {
+	printm(M_WARNING, "Read16 at a non 16-bits boundary: 0x%08x\n", mem);
+    }
+
+    a = Read8(mem);
+    b = Read8(mem + 1);
+    
+    return a | (b << 8);
+}
+
+Uint32 mips::Read32(Uint32 mem) {
+    Uint8 a, b, c, d;
+    
+    if (mem & 3) {
+	printm(M_WARNING, "Read32 at a non 32-bits boundary: 0x%08x\n", mem);
+    }
+    
+    a = Read8(mem);
+    b = Read8(mem + 1);
+    c = Read8(mem + 2);
+    d = Read8(mem + 3);
+    
+    return a | (b << 8) | (c << 16) | (d << 24);
+}
+
+void mips::Write8(Uint32 mem, Uint8 value) {
+    if ((mem < 0x80000000) || (mem > (0x80200000 - 1))) {
+	printm(M_WARNING, "Reading at out of bound of memory: 0x%08x\n", mem);
+	return;
+    }
+    
+    mem -= 0x80000000;
+    
+    patch(mem, 1);
+    patches[mem] = value;
+}
+
+void mips::Write16(Uint32 mem, Uint16 value) {
+    if ((mem < 0x80000000) || (mem > (0x80200000 - 2))) {
+	printm(M_WARNING, "Reading at out of bound of memory: 0x%08x\n", mem);
+	return;
+    }
+
+    mem -= 0x80000000;
+    
+    patch(mem, 2);
+    patches[mem] = value & 0xff;
+    patches[mem + 1] = (value >> 8) & 0xff;
+}
+
+void mips::Write32(Uint32 mem, Uint32 value) {
+    if ((mem < 0x80000000) || (mem > (0x80200000 - 4))) {
+	printm(M_WARNING, "Reading at out of bound of memory: 0x%08x\n", mem);
+	return;
+    }
+
+    mem -= 0x80000000;
+    
+    patch(mem, 4);
+    patches[mem] = value & 0xff;
+    patches[mem + 1] = (value >> 8) & 0xff;
+    patches[mem + 2] = (value >> 16) & 0xff;
+    patches[mem + 3] = (value >> 24) & 0xff;
+}
+
+void mips::unpatch8(Uint32 mem) {
+    unpatch(mem, 1);
+}
+
+void mips::unpatch16(Uint32 mem) {
+    unpatch(mem, 2);
+}
+
+void mips::unpatch32(Uint32 mem) {
+    unpatch(mem, 4);
+}
+
+bool mips::IsPatched(Uint32 mem) {
+    int mask, pos;
+    
+    pos = mem / 8;
+    mask = 1 << (mem % 8);
+    
+    return patchesmap[pos] &= mask;
+}
+
+void mips::LoadEXE(Handle * h) {
+    h->read(psyqhead, 0x800);
+    memset(plainmemory, 0, 0x200000);
+    paddr = ((psyq*)psyqhead)->t_addr;
+    psize = ((psyq*)psyqhead)->t_size;
+
+    printm(M_INFO, "Loading %i (%08x) bytes of data at %i (%08x).\n", psize, psize, paddr - 0x80000000, paddr);
+    
+    h->read(plainmemory + paddr - 0x80000000, psize);
+}
+
+void mips::SaveEXE(Handle * h) {\
+    Uint32 i;
+    
+    if (!*((Uint32 *)psyqhead))
+	return;
+    h->write(psyqhead, 0x800);
+    paddr = ((psyq*)psyqhead)->t_addr;
+    psize = ((psyq*)psyqhead)->t_size;
+
+    printm(M_INFO, "Writing %i (%08x) bytes of data from %i (%08x).\n", psize, psize, paddr - 0x80000000, paddr);
+    
+    for (i = paddr - 0x80000000; i < psize; i++) {
+	h->writeU8(Read8(i));
+    }
+}
+
+Uint32 mips::GetPC() {
+    return startpc;
+}
+
+void mips::patch(Uint32 mem, int size) {
+    int mask, pos;
+    
+    pos = mem / 8;
+    mask = 1 << (mem % 8);
+    
+    patchesmap[pos] |= mask;
+    
+    if (size != 1) {
+	patch(mem + 1, size - 1);
+    }
+}
+
+void mips::unpatch(Uint32 mem, int size) {
+    int mask, pos;
+    
+    pos = mem / 8;
+    mask = ~(1 << (mem % 8));
+    
+    patchesmap[pos] &= mask;
+    
+    if (size != 1) {
+	unpatch(mem + 1, size - 1);
+    }
+}