util/uJcontext.c File Reference

Go to the source code of this file.

Functions
static void *	getStack (void)
	VERBOSE ()
int	getJcontext (uJcontext_t *u)
int	setJcontext (const uJcontext_t *u)
int	swapJcontext (uJcontext_t *o, const uJcontext_t *u)
void	makeJcontext (uJcontext_t *u, uJcontext_fn_t __func, int __argc, void *a, void *b)
Variables
char *	_dummyAllocaSetJcontext

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Function Documentation

static void* getStack

(

void

)

[static]

Definition at line 34 of file uJcontext.c.

References p.

Referenced by getJcontext(), and VERBOSE().

VERBOSE

(

)

Definition at line 39 of file uJcontext.c.

References getStack(), and printf().

Referenced by makeJcontext(), setJcontext(), and swapJcontext().

int getJcontext

(

uJcontext_t *

u

)

Definition at line 51 of file uJcontext.c.

References uJcontext_t::_uc_args, uJcontext_t::_uc_fn, getStack(), uJcontext_stack_t::ss_flags, uJcontext_stack_t::ss_size, uJcontext_stack_t::ss_sp, uJcontext_t::uc_flags, uJcontext_t::uc_link, uJcontext_t::uc_sigmask, uJcontext_t::uc_stack, and uJcontext_t::uc_swap.

Referenced by CthCreateInner().

int setJcontext

(

const uJcontext_t *

u

)

Some machines reference variables (e.g., arguments, saved link) from their caller's stack frame, so we need to leave a little extra space before the new stack pointer.

Microsoft's _alloca is too smart-- it checks the pages being allocated to see if they're all valid stack pages, so our hack of using a huge alloca to change the stack pointer instead results in an address error (from "chkstk").

Manually changing the stack pointer seems to work properly; and because local variables are referenced via the frame pointer (ebp), this is all that's needed.

Definition at line 69 of file uJcontext.c.

References uJcontext_t::_uc_args, uJcontext_t::_uc_fn, uJcontext_t::_uc_jmp_buf, printf(), setJcontext(), uJcontext_stack_t::ss_size, uJcontext_stack_t::ss_sp, uJcontext_t::uc_link, uJcontext_t::uc_stack, uJcontext_t::uc_swap, and VERBOSE().

Referenced by setJcontext(), and swapJcontext().

int swapJcontext	(	uJcontext_t *	o,
		const uJcontext_t *	u
	)

Definition at line 164 of file uJcontext.c.

References uJcontext_t::_uc_jmp_buf, printf(), setJcontext(), and VERBOSE().

void makeJcontext	(	uJcontext_t *	u,
		uJcontext_fn_t	__func,
		int	__argc,
		void *	a,
		void *	b
	)

Definition at line 183 of file uJcontext.c.

References uJcontext_t::_uc_args, uJcontext_t::_uc_fn, printf(), and VERBOSE().

Referenced by CthCreateInner().

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Variable Documentation

char* _dummyAllocaSetJcontext

Definition at line 66 of file uJcontext.c.