30 lines
1.0 KiB
C
30 lines
1.0 KiB
C
/* Simple work-around for running the 64-bit Adobe Flash plug-in version 10
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on Athlon64 processors without support for the lahf instruction.
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Compile with:
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cc -fPIC -shared -nostdlib -lc -oflashplugin-lahf-fix.so flashplugin-lahf-fix.c
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Then place the .so file in the plug-in directory (e.g. $HOME/.mozilla/plugins)
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or use LD_PRELOAD to force Firefox to load the library.
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- Maks Verver <maksverver@geocities.com> July 2009 */
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#define _GNU_SOURCE
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#include <stdlib.h>
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#include <signal.h>
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#include <ucontext.h>
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static void sig_handler(int signal, siginfo_t *info, void *context) {
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if (signal != SIGILL) return;
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if (*(char*)info->si_addr != (char)0x9f) abort();
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greg_t *regs = ((ucontext_t*)context)->uc_mcontext.gregs;
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((char*)®s[REG_RAX])[1] = ((char*)®s[REG_EFL])[0];
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regs[REG_RIP]++;
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}
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static struct sigaction old_sa, new_sa = {
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.sa_flags = SA_SIGINFO,
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.sa_sigaction = &sig_handler };
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int _init() { sigaction(SIGILL, &new_sa, &old_sa); return 0; }
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int _fini() { sigaction(SIGILL, &old_sa, &new_sa); return 0; }
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