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> I have a bit of anxiety over including it in 4.18 at this
> late date, because of the potential impact on all x86 configs.
Understandable. What the time frame for the 4.18 release? Any
idea of the rough plan for a follow up release? My concerns are:
1) Backtracing through sigtramps on Solaris is somewhat busted without
my changes (the Solaris library contains functions which don't use
%ebp as the frame pointer). For example ... the backtrace from
gdb.base/a1-selftest.exp (without my patch) shows:
#0 0x80068745 in _libc_sigprocmask ()
#1 0x80098763 in sigprocmask ()
#2 0x8107cb3 in rl_signal_handler (sig=134509072) at signals.c:156
#3 0x800685b1 in _sigacthandler ()
#4 <signal handler called>
#5 0x800682b8 in _libc_read ()
#6 0x8101ef9 in rl_getc (stream=0x800a9ad4) at readline.c:3123
#7 0x80ffa5b in rl_read_key () at readline.c:578
The correct backtrace is:
#0 0x80068745 in _libc_sigprocmask ()
#1 0x80098763 in sigprocmask ()
#2 0x8107fe7 in rl_signal_handler (sig=134509096) at signals.c:156
#3 0x800685b1 in _sigacthandler ()
#4 <signal handler called>
#5 0x800682b8 in _libc_read ()
#6 0x80098b33 in read ()
#7 0x810222d in rl_getc (stream=0x81639a0) at readline.c:3123
#8 0x80ffd8f in rl_read_key () at readline.c:578
2) The egcs patch to eliminate the frame pointer by default on the
x86 can't be installed until there's debugger support.
I certainly agree that this is a sizable change to the x86 support and
realize that it may not make sense for 4.18 if you guys are close to a
release. Drat. :-)
-- John
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