mirror of https://github.com/mkerrisk/man-pages
mprotect.2: Various fixes to Eugene Syromyatnikov's text
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -72,19 +72,20 @@ The memory can be executed.
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.TP
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.BR PROT_SEM " (since Linux 2.5.7)"
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The memory can be used for atomic operations.
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It was introduced as part of
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This flag was introduced as part of the
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.BR futex (2)
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implementation (in order to guarantee ability to perform atomic
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operations required by its commands such as
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implementation (in order to guarantee the ability to perform atomic
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operations required by commands such as
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.BR FUTEX_WAIT ),
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but not actually used in any currently supported architecture so far.
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.\" aba46c5027cb59d98052231b36efcbbde9c77a1d ef3d3246a0d06be622867d21af25f997aeeb105f
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but is not currently used in on any architecture.
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.TP
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.BR PROT_SAO " (since Linux 2.6.26)"
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.\" commit aba46c5027cb59d98052231b36efcbbde9c77a1d
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.\" commit ef3d3246a0d06be622867d21af25f997aeeb105f
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The memory should have strong access ordering.
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This feature is specific to
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PowerPC architecture
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(version 2.06 of architecture specification adds SAO CPU feature,
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the PowerPC architecture
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(version 2.06 of the architecture specification adds the SAO CPU feature,
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and it is available on POWER 7 or PowerPC A2, for example).
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.PP
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Additionally (since Linux 2.6.0),
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@ -96,17 +97,22 @@ can have one of the following flags set:
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.\" mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
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.\" And calc_vm_flag_bits converts only GROWSDOWN/DENYWRITE/LOCKED.
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.B PROT_GROWSUP
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Apply protection mode up to the end of the mapping which grows up
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(it should be a stack segment on HP PA-RISC,
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since there are no other ways to map a segment with
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.B VM_GROWSUP
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even if architecture has support for it.)
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Apply the protection mode up to the end of a mapping
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that grows upwards.
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(Such mappings are created for the stack area on
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architectures\(emfor example, HP-PARISC\(emthat
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have an upwardly growing stack.)
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.\" The VMA is one that was marked with VM_GROWSUP by the kernel
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.\" when the stack was created. Note that (unlike VM_GROWSDOWN),
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.\" there is no mmap() flag (analogous to MAP_GROWSDOWN) for
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.\" creating a VMA that is marked VM_GROWSUP.
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.TP
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.B PROT_GROWSDOWN
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Apply protection mode down to the beginning of the mapping which grows down
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(it should be stack segment or mapped with
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Apply the protection mode down to the beginning of a mapping
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that grows downward
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(which should be a stack segment or a segment mapped with the
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.B MAP_GROWSDOWN
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flag set.)
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flag set).
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.PP
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Like
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.BR mprotect (),
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@ -164,22 +170,13 @@ were specified in
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.IR prot .
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.TP
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.BR EINVAL
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Invalid (other than
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.BR PROT_READ ,
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.BR PROT_WRITE ,
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.BR PROT_EXEC ,
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.BR PROT_SEM ,
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.BR PROT_SAO
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(on PowerPC only),
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.BR PROT_GROWSUP ,
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.BR PROT_GROWSDOWN )
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flags specified in
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Invalid flags specified in
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.IR prot .
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.TP
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.BR EINVAL
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(PowerPC architecture)
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.B PROT_SAO
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specified in
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was specified in
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.IR prot ,
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but SAO hardware feature is not available.
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.TP
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