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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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src/arch/i386/include/bits/errfile.h
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@@ -23,6 +23,7 @@
#define ERRFILE_comboot ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00070000 )
#define ERRFILE_com32 ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00080000 )
#define ERRFILE_comboot_resolv ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00090000 )
#define ERRFILE_comboot_call ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x000a0000 )
#define ERRFILE_undi ( ERRFILE_ARCH | ERRFILE_NET | 0x00000000 )
#define ERRFILE_undiload ( ERRFILE_ARCH | ERRFILE_NET | 0x00010000 )