From c63f1d2151b551faeb437839a7e7903dde503dcd Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Fri, 29 May 2020 12:49:38 +0200
Subject: Add static assembly version of mach_print, in case it may be useful

---
 hurd/debugging/glibc.mdwn | 10 ++++++++++
 1 file changed, 10 insertions(+)

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:
 
-- 
cgit v1.2.3