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| author | Eric Botcazou <ebotcazou@act-europe.fr> | 2004-07-17 23:09:14 +0200 |
|---|---|---|
| committer | Eric Botcazou <ebotcazou@gcc.gnu.org> | 2004-07-17 21:09:14 +0000 |
| commit | e7a742ec9624db7b29d824a7b9899b73554322e3 (patch) | |
| tree | adb37612658bd4d95ab4862b248c91a39335be16 /gcc/doc | |
| parent | 6e34d3a39f0ce48e95a2853df4be8d01eb745850 (diff) | |
| download | gcc-e7a742ec9624db7b29d824a7b9899b73554322e3.zip gcc-e7a742ec9624db7b29d824a7b9899b73554322e3.tar.gz gcc-e7a742ec9624db7b29d824a7b9899b73554322e3.tar.bz2 | |
libgcc2.c (__enable_execute_stack): New symbol.
* libgcc2.c (__enable_execute_stack): New symbol.
* libgcc-std.ver (GCC_3.4.2): New version. Inherit from GCC_3.4
and declare __enable_execute_stack.
* mklibgcc.in (lib2funcs): Add _enable_execute_stack.
* config/netbsd.h (NETBSD_ENABLE_EXECUTE_STACK): ANSIfy.
* config/sol2.h (TRANSFER_FROM_TRAMPOLINE): Rename into
ENABLE_EXECUTE_STACK.
* config/alpha/alpha.c (alpha_initialize_trampoline): Conditionalize
on ENABLE_EXECUTE_STACK instead of TRANSFER_FROM_TRAMPOLINE.
* config/alpha/netbsd.h (TRANSFER_FROM_TRAMPOLINE): Rename into
ENABLE_EXECUTE_STACK.
* config/alpha/osf.h (TRANSFER_FROM_TRAMPOLINE): Likewise.
* config/i386/i386.c (x86_initialize_trampoline): Conditionalize
on ENABLE_EXECUTE_STACK instead of TRANSFER_FROM_TRAMPOLINE.
* config/i386/netbsd-elf.h (TRANSFER_FROM_TRAMPOLINE): Rename into
ENABLE_EXECUTE_STACK.
* config/i386/netbsd.h (TRANSFER_FROM_TRAMPOLINE): Likewise.
* config/i386/netbsd64.h (TRANSFER_FROM_TRAMPOLINE): Likewise.
* config/sparc/freebsd.h (TRANSFER_FROM_TRAMPOLINE): Likewise.
* config/sparc/netbsd-elf.h (TRANSFER_FROM_TRAMPOLINE): Likewise.
* config/sparc/sparc.c (sparc_initialize_trampoline): Conditionalize
on ENABLE_EXECUTE_STACK instead of TRANSFER_FROM_TRAMPOLINE.
(sparc64_initialize_trampoline): Likewise.
* doc/tm.texi (trampolines): Add ENABLE_EXECUTE_STACK macro.
From-SVN: r84880
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/tm.texi | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index ca5c995..c7aade3 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -4694,6 +4694,19 @@ typically be a series of @code{asm} statements. Both @var{beg} and @var{end} are both pointer expressions. @end defmac +The operating system may also require the stack to be made executable +before calling the trampoline. To implement this requirement, define +the following macro. + +@defmac ENABLE_EXECUTE_STACK +Define this macro if certain operations must be performed before executing +code located on the stack. The macro should expand to a series of C +file-scope constructs (e.g. functions) and provide a unique entry point +named @code{__enable_execute_stack}. The target is responsible for +emitting calls to the entry point in the code, for example from the +@code{INITIALIZE_TRAMPOLINE} macro. +@end defmac + To use a standard subroutine, define the following macro. In addition, you must make sure that the instructions in a trampoline fill an entire cache line with identical instructions, or else ensure that the |