[uml-devel] problems compiling 2.6.17 against glibc 2.4

[Nix <nix@esperi.org.uk>]

The problem is that arch/um/os-Linux/sys-i386/registers.c
messes around inside a jmp_buf, and in glibc 2.4 the glibc
maintainers have helpfully removed the definitions that
let you poke around in there (they were only there for the
sake of one macro, _JMPBUF_UNWINDS, which is no longer
user-visible.)

This vile patch lets me compile but is almost certainly not good enough:
however, I don't know what *is* good enough: now that glibc is blocking
us from the layout of the jmp_buf, what's to stop them from changing it?
(Well, other than that it would break the ABI ;) )

A temporary hack to make it compile is

--- linux-orig/arch/um/os-Linux/sys-i386/registers.c	2006-06-20 08:17:47.000000000 +0100
+++ linux/arch/um/os-Linux/sys-i386/registers.c	2006-06-21 07:54:52.000000000 +0100
@@ -130,6 +130,14 @@
 		       HOST_FP_SIZE * sizeof(unsigned long));
 }
 
+# define JB_BX  0
+# define JB_SI  1
+# define JB_DI  2
+# define JB_BP  3
+# define JB_SP  4
+# define JB_PC  5
+# define JB_SIZE 24
+
 void get_thread_regs(union uml_pt_regs *uml_regs, void *buffer)
 {
 	struct __jmp_buf_tag *jmpbuf = buffer;

but that's hardly acceptable in the long run.

-- 
`NB: Anyone suggesting that we should say "Tibibytes" instead of
 Terabytes there will be hunted down and brutally slain.
 That is all.' --- Matthew Wilcox

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