util/uJcontext.h File Reference

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Data Structures
struct	uJcontext_stack_t
	Describes the stack for a uJcontext flow of control. More...
struct	uJcontext_t
	Represents a uJcontext flow of control. More...
Typedefs
typedef void(*	uJcontext_fn_t )(void *a1, void *a2)
	Start a uJcontext flow of control.
typedef void(*	uJcontext_swap_fn_t )(struct uJcontext_t *newContext)
	Called before switching to a uJcontext flow of control.
Functions
int	getJcontext (uJcontext_t *__ucp)
int	setJcontext (const uJcontext_t *__ucp)
int	swapJcontext (uJcontext_t *__oucp, const uJcontext_t *__ucp)
void	makeJcontext (uJcontext_t *__ucp, uJcontext_fn_t func, int __argc, void *a1, void *a2)

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Typedef Documentation

typedef void(* uJcontext_fn_t)(void *a1, void *a2)

Start a uJcontext flow of control.

Definition at line 22 of file uJcontext.h.

typedef void(* uJcontext_swap_fn_t)(struct uJcontext_t *newContext)

Called before switching to a uJcontext flow of control.

Definition at line 42 of file uJcontext.h.

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Function Documentation

int getJcontext

(

uJcontext_t *

__ucp

)

Definition at line 52 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.

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int setJcontext

(

const uJcontext_t *

__ucp

)

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 70 of file uJcontext.C.

References uJcontext_t::_uc_args, uJcontext_t::_uc_fn, uJcontext_t::_uc_jmp_buf, 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().

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int swapJcontext	(	uJcontext_t *	__oucp,
		const uJcontext_t *	__ucp
	)

Definition at line 166 of file uJcontext.C.

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

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void makeJcontext	(	uJcontext_t *	__ucp,
		uJcontext_fn_t	func,
		int	__argc,
		void *	a1,
		void *	a2
	)

Definition at line 185 of file uJcontext.C.

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

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