C++ (Cpp) paravirt_patch_nop Examples

Example #1

File: paravirt.c Project: JcShang/linux-80211n-csitool

unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
				unsigned long addr, unsigned len)
{
	void *opfunc = get_call_destination(type);
	unsigned ret;

	if (opfunc == NULL)
		/* If there's no function, patch it with a ud2a (BUG) */
		ret = paravirt_patch_insns(insnbuf, len, ud2a, ud2a+sizeof(ud2a));
	else if (opfunc == _paravirt_nop)
		/* If the operation is a nop, then nop the callsite */
		ret = paravirt_patch_nop();

	/* identity functions just return their single argument */
	else if (opfunc == _paravirt_ident_32)
		ret = paravirt_patch_ident_32(insnbuf, len);
	else if (opfunc == _paravirt_ident_64)
		ret = paravirt_patch_ident_64(insnbuf, len);

	else if (type == PARAVIRT_PATCH(pv_cpu_ops.iret) ||
#ifdef CONFIG_X86_32
		 type == PARAVIRT_PATCH(pv_cpu_ops.irq_enable_sysexit) ||
#endif
		 type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret32) ||
		 type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret64))
		/* If operation requires a jmp, then jmp */
		ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len);
	else
		/* Otherwise call the function; assume target could
		   clobber any caller-save reg */
		ret = paravirt_patch_call(insnbuf, opfunc, CLBR_ANY,
					  addr, clobbers, len);

	return ret;
}

Example #2

File: paravirt.c Project: D-Land/operating-systems

static unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
			     unsigned long addr, unsigned len)
{
	const unsigned char *start, *end;
	unsigned ret;

	switch(type) {
#define SITE(x)	case PARAVIRT_PATCH(x):	start = start_##x; end = end_##x; goto patch_site
		SITE(irq_disable);
		SITE(irq_enable);
		SITE(restore_fl);
		SITE(save_fl);
		SITE(iret);
		SITE(irq_enable_sysexit);
		SITE(read_cr2);
		SITE(read_cr3);
		SITE(write_cr3);
		SITE(clts);
		SITE(read_tsc);
#undef SITE

	patch_site:
		ret = paravirt_patch_insns(ibuf, len, start, end);
		break;

	case PARAVIRT_PATCH(make_pgd):
	case PARAVIRT_PATCH(make_pte):
	case PARAVIRT_PATCH(pgd_val):
	case PARAVIRT_PATCH(pte_val):
#ifdef CONFIG_X86_PAE
	case PARAVIRT_PATCH(make_pmd):
	case PARAVIRT_PATCH(pmd_val):
#endif
		/* These functions end up returning exactly what
		   they're passed, in the same registers. */
		ret = paravirt_patch_nop();
		break;

	default:
		ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
		break;
	}

	return ret;
}

Example #3

File: paravirt.c Project: D-Land/operating-systems

unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
				unsigned long addr, unsigned len)
{
	void *opfunc = *((void **)&paravirt_ops + type);
	unsigned ret;

	if (opfunc == NULL)
		/* If there's no function, patch it with a ud2a (BUG) */
		ret = paravirt_patch_insns(insnbuf, len, start_ud2a, end_ud2a);
	else if (opfunc == paravirt_nop)
		/* If the operation is a nop, then nop the callsite */
		ret = paravirt_patch_nop();
	else if (type == PARAVIRT_PATCH(iret) ||
		 type == PARAVIRT_PATCH(irq_enable_sysexit))
		/* If operation requires a jmp, then jmp */
		ret = paravirt_patch_jmp(opfunc, insnbuf, addr, len);
	else
		/* Otherwise call the function; assume target could
		   clobber any caller-save reg */
		ret = paravirt_patch_call(insnbuf, opfunc, CLBR_ANY,
					  addr, clobbers, len);

	return ret;
}