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[comboot] Allow for tail recursion of COMBOOT images

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Multi-level menus via COMBOOT rely on the COMBOOT program being able
to exit and invoke a new COMBOOT program (the next menu).  This works,
but rapidly (within about five iterations) runs out of space in gPXE's
internal stack, since each new image is executed in a new function
context.

Fix by allowing tail recursion between images; an image can now
specify a replacement image for itself, and image_exec() will perform
the necessary tail recursion.
This commit is contained in:
Michael Brown
2009-02-17 00:47:35 +00:00
parent 349868b8fd
commit 8904cd55f1
8 changed files with 178 additions and 113 deletions
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14
src/arch/i386/include/comboot.h
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@@ -79,18 +79,14 @@ extern int comboot_resolv ( const char *name, struct in_addr *address );
/* setjmp/longjmp context buffer used to return after loading an image */
extern jmp_buf comboot_return;
/* Command line to execute when returning via comboot_return
* with COMBOOT_RETURN_RUN_KERNEL
*/
extern char *comboot_kernel_cmdline;
/* Execute comboot_image_cmdline */
extern void comboot_run_kernel ( );
/* Replacement image when exiting with COMBOOT_EXIT_RUN_KERNEL */
extern struct image *comboot_replacement_image;
extern void *com32_external_esp;
#define COMBOOT_RETURN_EXIT 1
#define COMBOOT_RETURN_RUN_KERNEL 2
#define COMBOOT_EXIT 1
#define COMBOOT_EXIT_RUN_KERNEL 2
#define COMBOOT_EXIT_COMMAND 3
extern void comboot_force_text_mode ( void );