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| author | kib <kib@FreeBSD.org> | 2015-01-31 21:43:46 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2015-01-31 21:43:46 +0000 |
| commit | 3bbc91d138d490edd1e55e311bae6c167da61fb8 (patch) | |
| tree | c59ea8ad2996445d89d6f2338e4a25a24ab968a8 /sys/sys/ucontext.h | |
| parent | 1831e3d7dcde53b6f53b3d79d72dc59b8cc1420b (diff) | |
| download | FreeBSD-src-3bbc91d138d490edd1e55e311bae6c167da61fb8.zip FreeBSD-src-3bbc91d138d490edd1e55e311bae6c167da61fb8.tar.gz | |
Do not qualify the mcontext_t *mcp argument for set_mcontext(9) as
const. On x86, even after the machine context is supposedly read into
the struct ucontext, lazy FPU state save code might only mark the FPU
data as hardware-owned. Later, set_fpcontext() needs to fetch the
state from hardware, modifying the *mcp.
The set_mcontext(9) is called from sigreturn(2) and setcontext(2)
implementations and old create_thread(2) interface, which throw the
*mcp out after the set_mcontext() call.
Reported by: dim
Discussed with: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Diffstat (limited to 'sys/sys/ucontext.h')
| -rw-r--r-- | sys/sys/ucontext.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/sys/ucontext.h b/sys/sys/ucontext.h index f69c8d8..e80ed50 100644 --- a/sys/sys/ucontext.h +++ b/sys/sys/ucontext.h @@ -99,7 +99,7 @@ struct thread; /* Machine-dependent functions: */ int get_mcontext(struct thread *, mcontext_t *, int); -int set_mcontext(struct thread *, const mcontext_t *); +int set_mcontext(struct thread *, mcontext_t *); #endif /* !_KERNEL */ |
