[PATCH] uml: start cross-build support : mk_user_constants
Beginning of cross-build fixes. Instead of expecting that mk_user_constants
(compiled and executed on the build box) will see the sizeof, etc. for target
box, we do what every architecture already does for asm-offsets. Namely, have
user-offsets.c compiled *for* *target* into user-offsets.s and sed it into the
header with relevant constants. We don't need to reinvent any wheels - all
tools are already there.
This patch deals with mk_user_constants. It doesn't assume any relationship
between target and build environment anymore - we pick all defines we need
from user-offsets.h. Later patches will deal with the rest of mk_... helpers
in the same way.
Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/um/sys-i386/user-offsets.c b/arch/um/sys-i386/user-offsets.c
new file mode 100644
index 0000000..3ceaabc
--- /dev/null
+++ b/arch/um/sys-i386/user-offsets.c
@@ -0,0 +1,69 @@
+#include <stdio.h>
+#include <signal.h>
+#include <asm/ptrace.h>
+#include <asm/user.h>
+#include <linux/stddef.h>
+
+#define DEFINE(sym, val) \
+ asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define OFFSET(sym, str, mem) \
+ DEFINE(sym, offsetof(struct str, mem));
+
+void foo(void)
+{
+ OFFSET(SC_IP, sigcontext, eip);
+ OFFSET(SC_SP, sigcontext, esp);
+ OFFSET(SC_FS, sigcontext, fs);
+ OFFSET(SC_GS, sigcontext, gs);
+ OFFSET(SC_DS, sigcontext, ds);
+ OFFSET(SC_ES, sigcontext, es);
+ OFFSET(SC_SS, sigcontext, ss);
+ OFFSET(SC_CS, sigcontext, cs);
+ OFFSET(SC_EFLAGS, sigcontext, eflags);
+ OFFSET(SC_EAX, sigcontext, eax);
+ OFFSET(SC_EBX, sigcontext, ebx);
+ OFFSET(SC_ECX, sigcontext, ecx);
+ OFFSET(SC_EDX, sigcontext, edx);
+ OFFSET(SC_EDI, sigcontext, edi);
+ OFFSET(SC_ESI, sigcontext, esi);
+ OFFSET(SC_EBP, sigcontext, ebp);
+ OFFSET(SC_TRAPNO, sigcontext, trapno);
+ OFFSET(SC_ERR, sigcontext, err);
+ OFFSET(SC_CR2, sigcontext, cr2);
+ OFFSET(SC_FPSTATE, sigcontext, fpstate);
+ OFFSET(SC_SIGMASK, sigcontext, oldmask);
+ OFFSET(SC_FP_CW, _fpstate, cw);
+ OFFSET(SC_FP_SW, _fpstate, sw);
+ OFFSET(SC_FP_TAG, _fpstate, tag);
+ OFFSET(SC_FP_IPOFF, _fpstate, ipoff);
+ OFFSET(SC_FP_CSSEL, _fpstate, cssel);
+ OFFSET(SC_FP_DATAOFF, _fpstate, dataoff);
+ OFFSET(SC_FP_DATASEL, _fpstate, datasel);
+ OFFSET(SC_FP_ST, _fpstate, _st);
+ OFFSET(SC_FXSR_ENV, _fpstate, _fxsr_env);
+
+ DEFINE(HOST_FRAME_SIZE, FRAME_SIZE);
+ DEFINE(HOST_FP_SIZE,
+ sizeof(struct user_i387_struct) / sizeof(unsigned long));
+ DEFINE(HOST_XFP_SIZE,
+ sizeof(struct user_fxsr_struct) / sizeof(unsigned long));
+
+ DEFINE(HOST_IP, EIP);
+ DEFINE(HOST_SP, UESP);
+ DEFINE(HOST_EFLAGS, EFL);
+ DEFINE(HOST_EAX, EAX);
+ DEFINE(HOST_EBX, EBX);
+ DEFINE(HOST_ECX, ECX);
+ DEFINE(HOST_EDX, EDX);
+ DEFINE(HOST_ESI, ESI);
+ DEFINE(HOST_EDI, EDI);
+ DEFINE(HOST_EBP, EBP);
+ DEFINE(HOST_CS, CS);
+ DEFINE(HOST_SS, SS);
+ DEFINE(HOST_DS, DS);
+ DEFINE(HOST_FS, FS);
+ DEFINE(HOST_ES, ES);
+ DEFINE(HOST_GS, GS);
+ DEFINE(__UM_FRAME_SIZE, sizeof(struct user_regs_struct));
+}