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| author | Rich Felker <dalias@aerifal.cx> | 2015-09-22 20:51:59 +0000 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2015-09-22 20:51:59 +0000 |
| commit | e9e770dfd6224a5ff7932b6115a35005dce7be29 (patch) | |
| tree | c80fdd991fffe322502d01440b005f1c1faeb444 | |
| parent | c87a52103399135d2f57a91a8bcc749d8cb2ca83 (diff) | |
| download | musl-e9e770dfd6224a5ff7932b6115a35005dce7be29.tar.gz | |
have sh/fdpic entry point set fdpic personality if needed
the entry point code supports being loaded by a loader which is not
fdpic-aware (in practice, either kernel with mmu or qemu without fdpic
support). this mostly just works, but signal handling will wrongly use
a function descriptor address as a code address if the personality is
not adjusted to fdpic.
ideally this code could be placed with sigaction so that it's not
needed except if/when a signal handler is installed. however,
personality is incorrectly maintained per-thread by the kernel, rather
than per-process, so it's necessary to correct the personality before
any threads are started. also, in order to skip the personality
syscall when an fdpic-aware loader is used, we need to be able to
detect how the program was loaded, and this information is only
readily available at the entry point.
| -rw-r--r-- | arch/sh/crt_arch.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/sh/crt_arch.h b/arch/sh/crt_arch.h index d63ce0d1..948bcb79 100644 --- a/arch/sh/crt_arch.h +++ b/arch/sh/crt_arch.h @@ -4,6 +4,18 @@ __asm__( ".text \n" ".global " START " \n" START ": \n" +" tst r8, r8 \n" +" bf 1f \n" +" mov #68, r3 \n" +" add r3, r3 \n" +" mov #8, r4 \n" +" swap.w r4, r4 \n" +" trapa #31 \n" +" nop \n" +" nop \n" +" nop \n" +" nop \n" +"1: nop \n" #ifndef SHARED " mov r8, r4 \n" " mova 1f, r0 \n" |