https://bugs.kde.org/show_bug.cgi?id=385412
--- Comment #17 from Vadim Barkov <vbr...@gmail.com> ---
(In reply to Julian Seward from comment #14)
> Can you tell me briefly what PPNO does? Specifically, what inputs and
> what outputs (registers and memory) does it have? Then I can maybe suggest
> an alternative implementation.
There is some pseudocode:
#define gpr0 0
#define gpr1 1
// r1 and r2 are even
void ppno(register r1, register r2) {
addressOfParameterBlock = valueOf(gpr1)
switch(valueOf(gpr0)) {
case 0x0:
// Query mode, ignore r1 and r2
// Save 16 bytes to addressOfParameterBlock
break;
case 0x3:
// SHA-512 generate mode, ignore r2 value
// Read 240 bytes from addressOfParameterBlock
addressOfResult = valueOf(r1);
resultLength = valueOf(r1 + 1);
// Write resultLength bytes to addressOfResult
// Overwrite some of 240 bytes starting from addressOfParameterBlock
break;
case 0x83:
// SHA-512 seed mode, ignore r1 value
// Read some of 240 bytes starting from addressOfParameterBlock
argumentAddress = valueOf(r2);
argumentLength = valueOf(r2 + 1);
// Read argumentLength bytes from argumentAddress
// Write 240 bytes to addressOfParameterBlock
break;
default:
// Specification exception, abort execution.
}
}
--
You are receiving this mail because:
You are watching all bug changes.
