I wrote basic Waf scripts for building a kernel skeleton, ISO-image creation and running QEMU emulator. Waf is pretty convenient and intuitive. The only problem I coped with trying to link my kernel was the following error: Node X is created more than once. Thus I didn’t succeed to use cprogram or cxxprogram for this task, so I used a generic task generator with a given rule. Will not explain this stuff with a greater detail - it’s not noteworthy.
Let me show you how did I employ C++11 raw string literals while writing inline assembly:
namespace {
__attribute__((used))
void BStart32() {
__asm__(R"!!!(
.text
.global __bstart32
__bstart32:
movl %0, %%esp
movl %%ebx, __multiboot_info
movb $0xFF, %%al
outb %%al, $0xA1
outb %%al, $0x21 # disable IRQs
movl %%cr4, %%edx # enable SSE
orl %1, %%edx
movl %%edx, %%cr4
call __boot32
.global __halt
__halt:
hlt
jmp __halt
)!!!" : : "i"(__bsp_boot_stack+kBspBootStackSize), "i"(CR4RegBit::kOSFXSR));
}
}As you can see, the raw strings support enables me to write assembly just as I would wrote it in dedicated s-file: no semicolons, no extra quotes. Very useful.
Note: to use immediate operands in the inline assembly I wrap the code by a dummy function called BStart32. It’s not supposed to be called and it’s not visible outside the module (anonymous namespace).