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| author | Rich Felker <dalias@aerifal.cx> | 2015-09-23 18:33:49 +0000 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2015-09-23 18:33:49 +0000 |
| commit | b61df2294f662540786f2558f691eba7447ff5ba (patch) | |
| tree | 097e5fc922c4379fe7291f9381fa4fb0b79c1228 /src/signal | |
| parent | 6c5cad2aa56745302c1d42d2c8baf6424d29c0f3 (diff) | |
| download | musl-b61df2294f662540786f2558f691eba7447ff5ba.tar.gz musl-b61df2294f662540786f2558f691eba7447ff5ba.tar.xz musl-b61df2294f662540786f2558f691eba7447ff5ba.zip | |
fix signal return for sh/fdpic
the restorer function pointer provided in the kernel sigaction structure is interpreted by the kernel as a raw code address, not a function descriptor. this commit moves the declarations of the __restore and __restore_rt symbols to ksigaction.h so that arch versions of the file can override them, and introduces a version for sh which declares them as objects rather than functions. an alternate solution would have been defining SA_RESTORER to 0 so that the functions are not used, but this both requires executable stack (since the sh kernel does not have a vdso page with permanent restorer functions) and crashes on qemu user-level emulation.
Diffstat (limited to 'src/signal')
| -rw-r--r-- | src/signal/sh/restore.s | 2 | ||||
| -rw-r--r-- | src/signal/sigaction.c | 2 |
2 files changed, 0 insertions, 4 deletions
diff --git a/src/signal/sh/restore.s b/src/signal/sh/restore.s index eaedcdfb..d5df8e14 100644 --- a/src/signal/sh/restore.s +++ b/src/signal/sh/restore.s @@ -1,5 +1,4 @@ .global __restore -.type __restore, @function __restore: mov #119, r3 !__NR_sigreturn trapa #31 @@ -11,7 +10,6 @@ __restore: or r0, r0 .global __restore_rt -.type __restore_rt, @function __restore_rt: mov #100, r3 !__NR_rt_sigreturn add #73, r3 diff --git a/src/signal/sigaction.c b/src/signal/sigaction.c index d5f47741..ab23a6f2 100644 --- a/src/signal/sigaction.c +++ b/src/signal/sigaction.c @@ -6,8 +6,6 @@ #include "libc.h" #include "ksigaction.h" -void __restore(), __restore_rt(); - static int unmask_done; static unsigned long handler_set[_NSIG/(8*sizeof(long))]; |