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git-svn-id: svn://svn.cc65.org/cc65/trunk@338 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
2000-09-24 20:54:49 +00:00
parent 16bc247cbf
commit 42fb5661f1
14 changed files with 549 additions and 98 deletions
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41
src/da65/code.c
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@@ -52,10 +52,10 @@
static unsigned char CodeBuf [0x10000]; /* Code buffer */
static unsigned long CodeStart; /* Start address */
static unsigned long CodeEnd; /* End address */
static unsigned long PC; /* Current PC */
unsigned char CodeBuf [0x10000]; /* Code buffer */
unsigned long CodeStart; /* Start address */
unsigned long CodeEnd; /* End address */
unsigned long PC; /* Current PC */
@@ -99,37 +99,20 @@ void LoadCode (const char* Name, unsigned long StartAddress)
unsigned GetPC (void)
/* Get the current program counter */
unsigned char GetCodeByte (unsigned Addr)
/* Get a byte from the given address */
{
return PC;
PRECONDITION (Addr <= CodeEnd);
return CodeBuf [Addr];
}
unsigned char PeekCodeByte (void)
/* Peek at the byte at the current PC */
unsigned GetCodeWord (unsigned Addr)
/* Get a word from the given address */
{
PRECONDITION (PC <= CodeEnd);
return CodeBuf [PC];
}
unsigned char GetCodeByte (void)
/* Get a byte from the PC and increment it */
{
PRECONDITION (PC <= CodeEnd);
return CodeBuf [PC++];
}
unsigned GetCodeWord (void)
/* Get a word from the current PC and increment it */
{
unsigned Lo = GetCodeByte ();
unsigned Hi = GetCodeByte ();
unsigned Lo = GetCodeByte (Addr);
unsigned Hi = GetCodeByte (Addr+1);
return Lo | (Hi << 8);
}