https://github.com/torvalds/linux
To make UML build and run on s390, I needed to do these two little changes: 1) UML includes some of the subarch's (s390) headers. I had to change one of them with the following one-liner, to make this compile. AFAICS, this change doesn't break compilation of s390 itself. 2) UML needs to intercept syscalls via ptrace to invalidate the syscall, read syscall's parameters and write the result with the result of UML's syscall processing. Also, UML needs to make sure, that the host does no syscall restart processing. On i386 for example, this can be done by writing -1 to orig_eax on the 2nd syscall interception (orig_eax is the syscall number, which after the interception is used as a "interrupt was a syscall" flag only. Unfortunately, s390 holds syscall number and syscall result in gpr2 and its "interrupt was a syscall" flag (trap) is unreachable via ptrace. So I changed the host to set trap to -1, if the syscall number is changed to an invalid value on the first syscall interception. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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[PATCH] s390: uml ptrace fixes
File | Mode | Size |
---|---|---|
Documentation | ||
arch | ||
crypto | ||
drivers | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
scripts | ||
security | ||
sound | ||
usr | ||
COPYING | -rw-r--r-- | 18.3 KB |
CREDITS | -rw-r--r-- | 87.1 KB |
MAINTAINERS | -rw-r--r-- | 55.9 KB |
Makefile | -rw-r--r-- | 43.2 KB |
README | -rw-r--r-- | 13.6 KB |
REPORTING-BUGS | -rw-r--r-- | 2.9 KB |
Computing file changes ...