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-rw-r--r--hurd/debugging/glibc.mdwn10
1 files changed, 10 insertions, 0 deletions
diff --git a/hurd/debugging/glibc.mdwn b/hurd/debugging/glibc.mdwn
index 10a41503..a409f392 100644
--- a/hurd/debugging/glibc.mdwn
+++ b/hurd/debugging/glibc.mdwn
@@ -75,6 +75,16 @@ If your `mach_traps.h` does not have the declaration, use:
extern void mach_print(const char *s);
+If you can't use the libc-provided `mach_print` for some reason, you can use as last resort:
+
+ asm("\
+ my_mach_print:\n\
+ mov $-30,%eax\n\
+ lcall $7,$0\n\
+ ret\n\
+ ");
+ extern void my_mach_print(const char *s);
+
This call does not support any formatting. You can use this kind of helper to
format a message before passing to gnumach: