mc68ec060 Freescale Semiconductor, Inc, mc68ec060 Datasheet - Page 371

• Manufacturer Part Number: mc68ec060
• Description: Mc68060 Superscalar 68k Microprocessor Including The Lc060 And Ec060
• Manufacturer: Freescale Semiconductor, Inc

MC68060 Software Package
The condition code register upon return from all of the library routines is correct. Figure C-5
provides a C-code representation of the integer library routines in the M68060SP.
For example, to use a 64-bit divide instruction, do a “bsr” or “jsr” to the entry-point defined
by the MC68060ILSP entry table. A compiler-generated code sequence for unsigned multi-
ply could resemble Figure C-6.
The library routines also return the correct condition code register value. If this is important,
then the caller of the library routine must make sure that the value is not lost while popping
other items off of the stack. An example of using the CMP2 instruction is given in Figure C-7.
The unimplemented integer instruction library module contains no operating system depen-
dencies and does not require a call-out dispatch table. If the instruction being emulated is a
C-10
/* 64-bit (32x32 -> 64) unsigned multiply routine */
void _mulu64(multiplier,multiplicand,result)
/* 64-bit (32x32 -> 64) signed multiply routine */
void _muls64(multiplier,multiplicand,result)
/* 64-bit (32/32 -> 32r:32q) unsigned divide routine */
void _divu64(divisor,dividend_hi,dividend_lo,result)
/* 64-bit (32/32 -> 32r:32q) signed divide routine */
void _divs64(divisor,dividend_hi,dividend_lo,result)
/* CMP2 using an “A”ddress or “D”ata register. size = byte. */
void _cmp2_{D,A}b(rn,bounds)
/* CMP2 using an “A”ddress or “D”ata register. size = word. */
void _cmp2_{D,A}w(rn,bounds)
/* CMP2 using an “A”ddress or “D”ata register. size = longword. */
void _cmp2_{D,A}l(rn,bounds)
Figure C-5. C-Code Representation of Integer Library Routines
unsigned int multiplier;
unsigned int multiplicand;
unsigned int *result; /* array for result */
int multiplier;
int multiplicand;
int *result; /* array for result */
unsigned int divisor;
unsigned int dividend_hi, dividend_lo;
unsigned int *result; /* array for result */
int divisor;
int dividend_hi,dividend_lo;
int *result; /* array for result */
int rn;
char *bounds; /* pointer to byte bounds array */
int rn;
short *bounds; /* pointer to word bounds array */
int rn;
int *bounds; /* pointer to longword bounds array */
M68060 USER’S MANUAL
MOTOROLA