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x86: move x86_userspace_thread_exit() from user stack to commpage

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x86_userspace_thread_exit() is a stub originally placed at the bottom of
each thread user stack that ensures any thread invokes exit_thread() upon
returning from its main higher level function.

Putting anything that is expected to be executed on a stack causes problems
when implementing data execution prevention. Code of x86_userspace_thread_exit()
is now moved to commpage which seems to be much more appropriate place for it.
This commit is contained in:
Pawel Dziepak
2013-04-04 15:16:27 +02:00
parent 537d84a07c
commit 211f71325a
7 changed files with 24 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files
headers/private/system/arch/x86/arch_commpage_defs.h
+2
View File
@@ -16,6 +16,8 @@
(COMMPAGE_ENTRY_FIRST_ARCH_SPECIFIC + 3)
#define COMMPAGE_ENTRY_X86_SIGNAL_HANDLER_BEOS \
(COMMPAGE_ENTRY_FIRST_ARCH_SPECIFIC + 4)
#define COMMPAGE_ENTRY_X86_THREAD_EXIT \
(COMMPAGE_ENTRY_FIRST_ARCH_SPECIFIC + 5)
#define ARCH_USER_COMMPAGE_ADDR (0xffff0000)
headers/private/system/arch/x86_64/arch_commpage_defs.h
+2
View File
@@ -13,6 +13,8 @@
#define COMMPAGE_ENTRY_X86_MEMSET (COMMPAGE_ENTRY_FIRST_ARCH_SPECIFIC + 1)
#define COMMPAGE_ENTRY_X86_SIGNAL_HANDLER \
(COMMPAGE_ENTRY_FIRST_ARCH_SPECIFIC + 2)
#define COMMPAGE_ENTRY_X86_THREAD_EXIT \
(COMMPAGE_ENTRY_FIRST_ARCH_SPECIFIC + 3)
#define ARCH_USER_COMMPAGE_ADDR (0xffffffffffff0000)