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authorPeter Maydell <peter.maydell@linaro.org>2013-02-20 15:21:09 +0000
committerBlue Swirl <blauwirbel@gmail.com>2013-02-23 16:11:19 +0000
commit6ab7e5465a4d6188e29398fb43a30dbab1015b75 (patch)
tree1e8bc48fc86c89b32a07f9379a40ed907d2a91dd /disas
parentd1c36ba707637173b818652e51181370d51b6c58 (diff)
downloadqemu-arm-6ab7e5465a4d6188e29398fb43a30dbab1015b75.tar.gz
Replace all setjmp()/longjmp() with sigsetjmp()/siglongjmp()
The setjmp() function doesn't specify whether signal masks are saved and restored; on Linux they are not, but on BSD (including MacOSX) they are. We want to have consistent behaviour across platforms, so we should always use "don't save/restore signal mask" (this is also generally going to be faster). This also works around a bug in MacOSX where the signal-restoration on longjmp() affects the signal mask for a completely different thread, not just the mask for the thread which did the longjmp. The most visible effect of this was that ctrl-C was ignored on MacOSX because the CPU thread did a longjmp which resulted in its signal mask being applied to every thread, so that all threads had SIGINT and SIGTERM blocked. The POSIX-sanctioned portable way to do a jump without affecting signal masks is to siglongjmp() to a sigjmp_buf which was created by calling sigsetjmp() with a zero savemask parameter, so change all uses of setjmp()/longjmp() accordingly. [Technically POSIX allows sigsetjmp(buf, 0) to save the signal mask; however the following siglongjmp() must not restore the signal mask, so the pair can be effectively considered as "sigjmp/longjmp which don't touch the mask".] For Windows we provide a trivial sigsetjmp/siglongjmp in terms of setjmp/longjmp -- this is OK because no user will ever pass a non-zero savemask. The setjmp() uses in tests/tcg/test-i386.c and tests/tcg/linux-test.c are left untouched because these are self-contained singlethreaded test programs intended to be run under QEMU's Linux emulation, so they have neither the portability nor the multithreading issues to deal with. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net> Tested-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Diffstat (limited to 'disas')
-rw-r--r--disas/i386.c6
-rw-r--r--disas/m68k.c11
2 files changed, 9 insertions, 8 deletions
diff --git a/disas/i386.c b/disas/i386.c
index dbecf1ffb5..73cc06f1c3 100644
--- a/disas/i386.c
+++ b/disas/i386.c
@@ -226,7 +226,7 @@ struct dis_private {
bfd_byte the_buffer[MAX_MNEM_SIZE];
bfd_vma insn_start;
int orig_sizeflag;
- jmp_buf bailout;
+ sigjmp_buf bailout;
};
enum address_mode
@@ -303,7 +303,7 @@ fetch_data2(struct disassemble_info *info, bfd_byte *addr)
STATUS. */
if (priv->max_fetched == priv->the_buffer)
(*info->memory_error_func) (status, start, info);
- longjmp (priv->bailout, 1);
+ siglongjmp(priv->bailout, 1);
}
else
priv->max_fetched = addr;
@@ -3661,7 +3661,7 @@ print_insn (bfd_vma pc, disassemble_info *info)
start_codep = priv.the_buffer;
codep = priv.the_buffer;
- if (setjmp (priv.bailout) != 0)
+ if (sigsetjmp(priv.bailout, 0) != 0)
{
const char *name;
diff --git a/disas/m68k.c b/disas/m68k.c
index c950241f79..cc0db96cae 100644
--- a/disas/m68k.c
+++ b/disas/m68k.c
@@ -624,7 +624,7 @@ struct private
bfd_byte *max_fetched;
bfd_byte the_buffer[MAXLEN];
bfd_vma insn_start;
- jmp_buf bailout;
+ sigjmp_buf bailout;
};
/* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
@@ -644,7 +644,7 @@ fetch_data2(struct disassemble_info *info, bfd_byte *addr)
if (status != 0)
{
(*info->memory_error_func) (status, start, info);
- longjmp (priv->bailout, 1);
+ siglongjmp(priv->bailout, 1);
}
else
priv->max_fetched = addr;
@@ -1912,9 +1912,10 @@ print_insn_m68k (bfd_vma memaddr, disassemble_info *info)
priv.max_fetched = priv.the_buffer;
priv.insn_start = memaddr;
- if (setjmp (priv.bailout) != 0)
- /* Error return. */
- return -1;
+ if (sigsetjmp(priv.bailout, 0) != 0) {
+ /* Error return. */
+ return -1;
+ }
switch (info->mach)
{