| Message ID | 20230405213612.15942-3-imp@bsdimp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | bsd-user 2023 Q2 first batch | expand |
On 4/5/23 14:35, Warner Losh wrote: > MAP_GUARD, MAP_EXCL, and MAP_NOCORE are FreeBSD only. Add back the > ifdefs that I removed in 36d5d891559f (but only these ifdefs, the > rest of the commit is not reverted). > > Signed-off-by: Warner Losh<imp@bsdimp.com> > --- > bsd-user/mmap.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c > index d6c5a344c9b..f732a6f6f2b 100644 > --- a/bsd-user/mmap.c > +++ b/bsd-user/mmap.c > @@ -416,27 +416,33 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, > qemu_log("MAP_ALIGNED(%u) ", > (flags & MAP_ALIGNMENT_MASK) >> MAP_ALIGNMENT_SHIFT); > } > +#ifdef MAP_GUARD > if (flags & MAP_GUARD) { > qemu_log("MAP_GUARD "); > } > +#endif Maybe better as #ifndef MAP_GUARD #define MAP_GUARD 0 #endif etc, somewhere common, and let the compiler eliminate the always false conditions. r~
On Sat, Apr 8, 2023 at 1:03 PM Richard Henderson < richard.henderson@linaro.org> wrote: > On 4/5/23 14:35, Warner Losh wrote: > > MAP_GUARD, MAP_EXCL, and MAP_NOCORE are FreeBSD only. Add back the > > ifdefs that I removed in 36d5d891559f (but only these ifdefs, the > > rest of the commit is not reverted). > > > > Signed-off-by: Warner Losh<imp@bsdimp.com> > > --- > > bsd-user/mmap.c | 10 ++++++++++ > > 1 file changed, 10 insertions(+) > > > > diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c > > index d6c5a344c9b..f732a6f6f2b 100644 > > --- a/bsd-user/mmap.c > > +++ b/bsd-user/mmap.c > > @@ -416,27 +416,33 @@ abi_long target_mmap(abi_ulong start, abi_ulong > len, int prot, > > qemu_log("MAP_ALIGNED(%u) ", > > (flags & MAP_ALIGNMENT_MASK) >> > MAP_ALIGNMENT_SHIFT); > > } > > +#ifdef MAP_GUARD > > if (flags & MAP_GUARD) { > > qemu_log("MAP_GUARD "); > > } > > +#endif > > Maybe better as > > #ifndef MAP_GUARD > #define MAP_GUARD 0 > #endif > > etc, somewhere common, and let the compiler eliminate the always false > conditions. > Interesting notion... I can do that in syscall_defs.h. If that's the pattern in qemu I'll do it here.... but I've been burned in the past by warnings about always true or always false conditions... It would be less invasive though... Warner
diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c index d6c5a344c9b..f732a6f6f2b 100644 --- a/bsd-user/mmap.c +++ b/bsd-user/mmap.c @@ -416,27 +416,33 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, qemu_log("MAP_ALIGNED(%u) ", (flags & MAP_ALIGNMENT_MASK) >> MAP_ALIGNMENT_SHIFT); } +#ifdef MAP_GUARD if (flags & MAP_GUARD) { qemu_log("MAP_GUARD "); } +#endif if (flags & MAP_FIXED) { qemu_log("MAP_FIXED "); } if (flags & MAP_ANON) { qemu_log("MAP_ANON "); } +#ifdef MAP_EXCL if (flags & MAP_EXCL) { qemu_log("MAP_EXCL "); } +#endif if (flags & MAP_PRIVATE) { qemu_log("MAP_PRIVATE "); } if (flags & MAP_SHARED) { qemu_log("MAP_SHARED "); } +#ifdef MAP_NOCORE if (flags & MAP_NOCORE) { qemu_log("MAP_NOCORE "); } +#endif if (flags & MAP_STACK) { qemu_log("MAP_STACK "); } @@ -454,6 +460,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, goto fail; } } +#ifdef MAP_GUARD if ((flags & MAP_GUARD) && (prot != PROT_NONE || fd != -1 || offset != 0 || (flags & (MAP_SHARED | MAP_PRIVATE | /* MAP_PREFAULT | */ /* MAP_PREFAULT not in mman.h */ @@ -461,6 +468,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, errno = EINVAL; goto fail; } +#endif if (offset & ~TARGET_PAGE_MASK) { errno = EINVAL; @@ -608,11 +616,13 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, goto the_end; } +#ifdef MAP_EXCL /* Reject the mapping if any page within the range is mapped */ if ((flags & MAP_EXCL) && page_check_range(start, len, 0) < 0) { errno = EINVAL; goto fail; } +#endif /* handle the start of the mapping */ if (start > real_start) {
MAP_GUARD, MAP_EXCL, and MAP_NOCORE are FreeBSD only. Add back the ifdefs that I removed in 36d5d891559f (but only these ifdefs, the rest of the commit is not reverted). Signed-off-by: Warner Losh <imp@bsdimp.com> --- bsd-user/mmap.c | 10 ++++++++++ 1 file changed, 10 insertions(+)