Date: Wed, 3 Feb 2016 01:50:27 +0000 (UTC) From: Justin Hibbits <jhibbits@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r295186 - head/sys/powerpc/powerpc Message-ID: <201602030150.u131oR3C048933@repo.freebsd.org>
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Author: jhibbits Date: Wed Feb 3 01:50:27 2016 New Revision: 295186 URL: https://svnweb.freebsd.org/changeset/base/295186 Log: Align signal stack pointer to 16 bytes. The stack must be aligned to 16 bytes at all times. Clang 3.8 is especially adamant about this, and causes strange behavior and segmentation faults if it is not the case. PR: kern/206810 Modified: head/sys/powerpc/powerpc/exec_machdep.c head/sys/powerpc/powerpc/sigcode32.S Modified: head/sys/powerpc/powerpc/exec_machdep.c ============================================================================== --- head/sys/powerpc/powerpc/exec_machdep.c Wed Feb 3 01:49:02 2016 (r295185) +++ head/sys/powerpc/powerpc/exec_machdep.c Wed Feb 3 01:50:27 2016 (r295186) @@ -219,10 +219,10 @@ sendsig(sig_t catcher, ksiginfo_t *ksi, */ if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && SIGISMEMBER(psp->ps_sigonstack, sig)) { - usfp = (void *)((uintptr_t)td->td_sigstk.ss_sp + - td->td_sigstk.ss_size - rndfsize); + usfp = (void *)(((uintptr_t)td->td_sigstk.ss_sp + + td->td_sigstk.ss_size - rndfsize) & ~0xFul); } else { - usfp = (void *)(tf->fixreg[1] - rndfsize); + usfp = (void *)((tf->fixreg[1] - rndfsize) & ~0xFul); } /* Modified: head/sys/powerpc/powerpc/sigcode32.S ============================================================================== --- head/sys/powerpc/powerpc/sigcode32.S Wed Feb 3 01:49:02 2016 (r295185) +++ head/sys/powerpc/powerpc/sigcode32.S Wed Feb 3 01:50:27 2016 (r295186) @@ -45,9 +45,9 @@ */ .globl CNAME(sigcode32),CNAME(szsigcode32) CNAME(sigcode32): - addi 1,1,-20 /* reserved space for callee */ + addi 1,1,-32 /* reserved space for callee */ blrl - addi 3,1,20+SF_UC /* restore sp, and get &frame->sf_uc */ + addi 3,1,32+SF_UC /* restore sp, and get &frame->sf_uc */ li 0,SYS_sigreturn sc /* sigreturn(scp) */ li 0,SYS_exit
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