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| author | Kevin Ryde <user42@zip.com.au> | 2003-05-20 22:13:34 +0000 |
|---|---|---|
| committer | Wolfgang Bangerth <bangerth@gcc.gnu.org> | 2003-05-20 16:13:34 -0600 |
| commit | 5d34c8e946a9df8f7c48739046418b28201077df (patch) | |
| tree | fca75c3443f240e7da77528540e3e61d193772f2 | |
| parent | a63996f10f6f3cc5b728849f8afc47e0ae2efedf (diff) | |
| download | gcc-5d34c8e946a9df8f7c48739046418b28201077df.tar.gz | |
doc/extend.texi: Put warning into documentation of attribute regparm.
Co-Authored-By: Wolfgang Bangerth <bangerth@dealii.org>
From-SVN: r67037
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/doc/extend.texi | 11 |
2 files changed, 18 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 4ec04bfffd4..c99a4fdaa48 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2003-05-20 Kevin Ryde <user42@zip.com.au> + Wolfgang Bangerth <bangerth@dealii.org> + + PR/10355 + * doc/extend.texi: Put a warning into the documentation + of attribute regparm. + 2003-05-20 Jason Merrill <jason@redhat.com> * tree.c (expr_last): New fn. diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 6006f04f574..dc9646ac5b5 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -2368,6 +2368,7 @@ since it is known that the calling function loaded the correct value. Not all ELF targets support this attribute. @item regparm (@var{number}) +@cindex @code{regparm} attribute @cindex functions that are passed arguments in registers on the 386 On the Intel 386, the @code{regparm} attribute causes the compiler to pass up to @var{number} integer arguments in registers EAX, @@ -2375,6 +2376,16 @@ EDX, and ECX instead of on the stack. Functions that take a variable number of arguments will continue to be passed all of their arguments on the stack. +Beware that on some ELF systems this attribute is unsuitable for +global functions in shared libraries with lazy binding (which is the +default). Lazy binding will send the first call via resolving code in +the loader, which might assume EAX, EDX and ECX can be clobbered, as +per the standard calling conventions. Solaris 8 is affected by this. +GNU systems with GLIBC 2.1 or higher, and FreeBSD, are believed to be +safe since the loaders there save all registers. (Lazy binding can be +disabled with the linker or the loader if desired, to avoid the +problem.) + @item stdcall @cindex functions that pop the argument stack on the 386 On the Intel 386, the @code{stdcall} attribute causes the compiler to |