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| author | Srdjan Petrovic <spetrovic@google.com> | 2015-04-09 11:12:12 -0700 |
|---|---|---|
| committer | Ian Lance Taylor <iant@golang.org> | 2015-04-24 05:19:39 +0000 |
| commit | 5c8fbc6f1e4ba78133c53ce73f82ad10e81b42f8 (patch) | |
| tree | d6e877ab0831d38259d2cf332236354de74f205d /src/runtime/sys_linux_arm.s | |
| parent | b075d1fc2eaacde75261969372fb3275ef694668 (diff) | |
| download | go-5c8fbc6f1e4ba78133c53ce73f82ad10e81b42f8.tar.gz go-5c8fbc6f1e4ba78133c53ce73f82ad10e81b42f8.zip | |
runtime: signal forwarding
Forward signals to signal handlers installed before Go installs its own,
under certain circumstances. In particular, as iant@ suggests, signals are
forwarded iff:
(1) a non-SIG_DFL signal handler existed before Go, and
(2) signal is synchronous (i.e., one of SIGSEGV, SIGBUS, SIGFPE), and
(3a) signal occured on a non-Go thread, or
(3b) signal occurred on a Go thread but in CGo code.
Supported only on Linux, for now.
Change-Id: I403219ee47b26cf65da819fb86cf1ec04d3e25f5
Reviewed-on: https://go-review.googlesource.com/8712
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Diffstat (limited to 'src/runtime/sys_linux_arm.s')
| -rw-r--r-- | src/runtime/sys_linux_arm.s | 36 |
1 files changed, 11 insertions, 25 deletions
diff --git a/src/runtime/sys_linux_arm.s b/src/runtime/sys_linux_arm.s index d0c6d22f31..3936cd93a8 100644 --- a/src/runtime/sys_linux_arm.s +++ b/src/runtime/sys_linux_arm.s @@ -327,7 +327,15 @@ TEXT runtime·sigaltstack(SB),NOSPLIT,$0 MOVW.HI R8, (R8) RET -TEXT runtime·sigtramp(SB),NOSPLIT,$24 +TEXT runtime·sigfwd(SB),NOSPLIT,$0-16 + MOVW sig+4(FP), R0 + MOVW info+8(FP), R1 + MOVW ctx+12(FP), R2 + MOVW fn+0(FP), R11 + BL (R11) + RET + +TEXT runtime·sigtramp(SB),NOSPLIT,$12 // this might be called in external code context, // where g is not set. // first save R0, because runtime·load_g will clobber it @@ -336,32 +344,10 @@ TEXT runtime·sigtramp(SB),NOSPLIT,$24 CMP $0, R0 BL.NE runtime·load_g(SB) - CMP $0, g - BNE 4(PC) - // signal number is already prepared in 4(R13) - MOVW $runtime·badsignal(SB), R11 - BL (R11) - RET - - // save g - MOVW g, R3 - MOVW g, 20(R13) - - // g = m->gsignal - MOVW g_m(g), R8 - MOVW m_gsignal(R8), g - - // copy arguments for call to sighandler - // R0 is already saved above MOVW R1, 8(R13) MOVW R2, 12(R13) - MOVW R3, 16(R13) - - BL runtime·sighandler(SB) - - // restore g - MOVW 20(R13), g - + MOVW $runtime·sigtrampgo(SB), R11 + BL (R11) RET TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0 |