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MFi386: revision 208604

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Clarify a potential issue in get_fpcontext() use.
This commit is contained in:
Yoshihiro Takahashi 2010-05-29 03:06:56 +00:00
parent c1564db05d
commit c80244db64
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=208632
1 changed files with 14 additions and 0 deletions
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14
sys/pc98/pc98/machdep.c
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@ -563,6 +563,13 @@ sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
sf.sf_uc.uc_mcontext.mc_gs = rgs();
bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
/*
* The get_fpcontext() call must be placed before assignments
* to mc_fsbase and mc_gsbase due to the alignment-override
* code in get_fpcontext() that possibly clobbers 12 bytes of
* mcontext after mc_fpstate.
*/
get_fpcontext(td, &sf.sf_uc.uc_mcontext);
fpstate_drop(td);
/*
@ -2455,6 +2462,13 @@ get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
mcp->mc_esp = tp->tf_esp;
mcp->mc_ss = tp->tf_ss;
mcp->mc_len = sizeof(*mcp);
/*
* The get_fpcontext() call must be placed before assignments
* to mc_fsbase and mc_gsbase due to the alignment-override
* code in get_fpcontext() that possibly clobbers 12 bytes of
* mcontext after mc_fpstate.
*/
get_fpcontext(td, mcp);
sdp = &td->td_pcb->pcb_gsd;
mcp->mc_fsbase = sdp->sd_hibase << 24 | sdp->sd_lobase;