44 lines
890 B
C++
44 lines
890 B
C++
asm {
|
|
PUT_DEC_U64::
|
|
//RAX is number to print in decimal.
|
|
//Preserves all regs.
|
|
ENTER 24 //24 char buffer on stack
|
|
PUSH_C_REGS //$LK,"Save regs","FF:::/TempleOS/Kernel/Adam1a.HPP,PUSH_C_REGS"$ which C code is free to clobber
|
|
PUSH RSI //This reg is not saved.
|
|
LEA RSI,-1[RBP] //Load addr of end of buffer.
|
|
//We picked RSI because of PUT_STR
|
|
//We'll move backward
|
|
MOV U8 [RSI],0 //Terminator
|
|
|
|
OR RAX,RAX //Special case -- zero
|
|
JNZ @@05
|
|
DEC RSI
|
|
MOV U8 [RSI],'0'
|
|
JMP @@15
|
|
|
|
@@05: MOV RBX,10 //Divides by 10
|
|
|
|
@@10: XOR RDX,RDX
|
|
DIV RBX //RAX=(RDX:RAX)/RBX with remainder in RDX
|
|
ADD RDX,'0'
|
|
DEC RSI
|
|
MOV U8 [RSI],DL
|
|
OR RAX,RAX
|
|
JNZ @@10
|
|
|
|
@@15: CALL &PUT_STR
|
|
POP RSI
|
|
POP_C_REGS
|
|
LEAVE
|
|
RET
|
|
|
|
_DO_IT:: //The convention is C-callable routines have underscores.
|
|
MOV RAX,122333221
|
|
CALL PUT_DEC_U64
|
|
PUSH 1
|
|
CALL &NewLine //Print one carriage return
|
|
RET
|
|
}
|
|
|
|
Call(_DO_IT);
|