diff options
| author | Flavio Cruz <flaviocruz@gmail.com> | 2023-11-30 02:08:01 -0500 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2023-12-03 01:01:41 +0100 |
| commit | 29d4bcaafc4c2040df27a6247603c68e7757205c (patch) | |
| tree | e690beca8fd1b0ff00645798dab866df6e77a67c /include | |
| parent | 2db6b9b7b23b3bab944665b3b6012d24dd425d97 (diff) | |
x86_64: Support 8 byte inlined port rights to avoid message resizing.
If a port is inlined in a message, the user has to use
mach_port_name_inlined_t to define each port. Out of line memory
continues to use mach_port_name_t since that memory has to be copied to
the kernel anyway.
Both copyinmsg and copyoutmsg can be reduced to nothing (if we ignore
USER32) as a follow up but kept this patch simple for ease of review.
Message-ID: <ZWg00XzFPqqL1yF-@jupiter.tail36e24.ts.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/mach/message.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/mach/message.h b/include/mach/message.h index 906ae797..0b8b34d4 100644 --- a/include/mach/message.h +++ b/include/mach/message.h @@ -221,6 +221,24 @@ typedef unsigned int mach_msg_type_name_t; typedef unsigned int mach_msg_type_size_t; typedef natural_t mach_msg_type_number_t; +/** + * Structure used for inlined port rights in messages. + * + * We use this to avoid having to perform message resizing in the kernel + * since userspace port rights might be smaller than kernel ports in 64 bit + * architectures. + */ +typedef struct { + union { + mach_port_name_t name; +#ifdef KERNEL + mach_port_t kernel_port; +#else + uintptr_t kernel_port_do_not_use; +#endif /* KERNEL */ + }; +} mach_port_name_inlined_t; + typedef struct { #ifdef __x86_64__ /* |