[newlib-cygwin] Update FAQ answer about setting an early breakpoint

[Jon TURNEY <jturney at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=afcde266182f4283a3a777570face6457b8d22b0

commit afcde266182f4283a3a777570face6457b8d22b0
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date:   Sun Sep 11 13:41:32 2016 +0100

    Update FAQ answer about setting an early breakpoint
    
    Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>

Diff:
---
 winsup/doc/faq-programming.xml | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/winsup/doc/faq-programming.xml b/winsup/doc/faq-programming.xml
index c64ab4a..5234414 100644
--- a/winsup/doc/faq-programming.xml
+++ b/winsup/doc/faq-programming.xml
@@ -811,13 +811,22 @@ Guide here: <ulink url="https://cygwin.com/cygwin-ug-net/dll.html"/>.
 </answer></qandaentry>
 
 <qandaentry id="faq.programming.breakpoint">
-<question><para>How can I set a breakpoint at MainCRTStartup?</para></question>
+<question><para>How can I set a breakpoint at mainCRTStartup?</para></question>
 <answer>
 
-<para><emphasis role='bold'>(Please note: This section has not yet been updated for the latest net release.)</emphasis>
+<para>
+  Set a breakpoint in <command>gdb</command> with <command>b *0x401000</command>
+  (for i686), or <command>b *0x100401000</command> (for x86_64).
+</para>
+
+<para>
+  This entrypoint address can be computed as the sum of the ImageBase and
+  AddressOfEntryPoint values given by <command>objdump -p</command>.
 </para>
-<para>Set a breakpoint at *0x401000 in gdb and then run the program in
-question.
+
+<para>
+  Note that the DllMain entrypoints for linked DLLs will have been executed
+  before this breakpoint is hit.
 </para>
 </answer></qandaentry>