First, thanks for your reply!
I have these two functions:
void SetCp15(unsigned int uCp15Val)
{
asm ("mcr p15, 0, %0, c1, c0, 0;" : "=r"(uCp15Val) :
);
}
unsigned int ReadCp15()
{
unsigned int x;
asm ("mrc p15, 0, %0, c1, c0, 0;" : "=r"(x) : );
return x;
}
If I compiled with -O3, they come with:
0000826c <_SetCp15>:
826c: e1a0c00d mov ip, sp
8270: e92dd800 stmdb sp!, {fp, ip, lr, pc}
8274: e24cb004 sub fp, ip, #4
8278: ee01ef10 mcr 15, 0, lr, cr1, cr0, {0}
827c: e91ba800 ldmdb fp, {fp, sp, pc}
00008280 <_ReadCp15>:
8280: e1a0c00d mov ip, sp
8284: e92dd800 stmdb sp!, {fp, ip, lr, pc}
8288: ee110f10 mrc 15, 0, r0, cr1, cr0, {0}
828c: e24cb004 sub fp, ip, #4
8290: e91ba800 ldmdb fp, {fp, sp, pc}
Are those assembler correct? Please help me! I don't
know what registers are those ip, sp, fp, lr, pc.
pc should be R15, right?
--- "Afzal, Naeem M" <[EMAIL PROTECTED]> wrote:
> one example would be:
>
> unsigned int _read_timer()
> {
> unsigned x;
> asm("mrc p14, 0, %0, c1, c0, 0;" : "=r"(x) : );
> return x;
> }
>
> naeem
> -----Original Message-----
> From: gavin li [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, October 10, 2001 6:12 PM
> To: [EMAIL PROTECTED]
> Subject: How to operate CP15 in gnu C code?
>
>
> for example : mcr p15,0,r14,c1,c0,0
> Anyone who knows how to implement those kind of
> instructions in gnu C code?
> by the way what does LTORG mean in ARM asm?
>
> Thanks,
>
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