This presentation covers PowerPc assembly language introduction such as PowerPC application binary interface and example of PowerPc assembly programs

1. POWERPC ASSEMBLY LANGUAGE
VINOD BUSSA

2. REGISTER USAGE CONVENTION
General Purpose Registers
•GPR0. Volatile register used in function prologs
•GPR1 Stack Pointer
•GPR2 TOC Pointer
•GPR3-13 Volatile Registers.
•GPR14-31 This registers must be preserved across function call
Floating Point Registers
•f0 Volatile scratch register
•f1-f4 Volatile floating-point parameter and return value registers
•f5-f13 Volatile floating-point parameter registers
•f14-f31 Non-volatile registers

3. REGISTER USAGE CONVENTION (CONTD..)
Special Purpose Registers
•LR. Link Register Volatile
•CTR Loop counter Register Volatile
•XER. Fixed point exception register Volatile
•FPSCR. Floating point status and control register Volatile
Condition Registers
•CR0-CR1 Volatile condition code register fields
•CR2-CR4 Non-volatile condition code register fields
•CR5-CR7 Volatile condition code register fields

4. SAMPLE ASSEMBLY PROGRAM 1
loop: lbz r4, 0(r3)
cmpwi r4, 0
beq done
addi r4, r4, 0x20
stb r4, 0(r3)
addi r3, r3, 1
b loop
done: b done

5. SAMPLE ASSEMBLY PROGRAM 2
li r4, 100
mtctr r4
loop: lwzu r5, 4(r6)
add r7, r7, r5
bdnz loop

6. SAMPLE ASSEMBLY PROGRAM 2
li r4, 100
mtctr r4
subi. r5,r5,8
line_loop:
lfd f0,0(r6)
addi r6,r6,8
stfdu f0,8(r5)
bdnz line_loop

7. THANK YOU