Revision e88d2468718b0789b4c33da2f7e1cef2a1eee279 authored by David S. Miller on 15 November 2011, 20:57:00 UTC, committed by David S. Miller on 15 November 2011, 20:57:00 UTC
As per the comments added by this commit, %g2 turns out to not be a usable place to save away orig_i0 for syscall restart handling. In fact all of %g2, %g3, %g4, and %g5 are assumed to be saved across a system call by various bits of code in glibc. %g1 can't be used because that holds the syscall number, which would need to be saved and restored for syscall restart handling too, and that would only compound our problems :-) This leaves us with %g6 and %g7 which are for "system use". %g7 is used as the "thread register" by glibc, but %g6 is used as a compiler and assembler temporary scratch register. And in no instance is %g6 used to hold a value across a system call. Therefore %g6 is safe for storing away orig_i0, at least for now. Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 1d299bc
File | Mode | Size |
---|---|---|
Documentation | ||
arch | ||
block | ||
crypto | ||
drivers | ||
firmware | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.gitignore | -rw-r--r-- | 1014 bytes |
.mailmap | -rw-r--r-- | 4.1 KB |
COPYING | -rw-r--r-- | 18.3 KB |
CREDITS | -rw-r--r-- | 92.6 KB |
Kbuild | -rw-r--r-- | 2.5 KB |
Kconfig | -rw-r--r-- | 252 bytes |
MAINTAINERS | -rw-r--r-- | 201.4 KB |
Makefile | -rw-r--r-- | 52.2 KB |
README | -rw-r--r-- | 17.0 KB |
REPORTING-BUGS | -rw-r--r-- | 3.3 KB |
Computing file changes ...