MFi386: revisions 1.534 and 1.535.
This commit is contained in:
Yoshihiro Takahashi
parent
394739140c
commit
ef46d97a45
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=103638
@ -143,6 +143,9 @@ extern void initializecpu(void);
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#endif
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static void cpu_startup(void *);
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static void fpstate_drop(struct thread *td);
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static void get_fpcontext(struct thread *td, mcontext_t *mcp);
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static int set_fpcontext(struct thread *td, const mcontext_t *mcp);
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#ifdef CPU_ENABLE_SSE
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static void set_fpregs_xmm(struct save87 *, struct savexmm *);
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static void fill_fpregs_xmm(struct savexmm *, struct save87 *);
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@ -460,8 +463,10 @@ sendsig(catcher, sig, mask, code)
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? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
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sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
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sf.sf_uc.uc_mcontext.mc_gs = rgs();
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sf.sf_uc.uc_mcontext.mc_flags = __UC_MC_VALID; /* no FP regs */
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bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
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sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
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get_fpcontext(td, &sf.sf_uc.uc_mcontext);
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fpstate_drop(td);
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/* Allocate space for the signal handler context. */
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if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack &&
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@ -695,7 +700,7 @@ sigreturn(td, uap)
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struct proc *p = td->td_proc;
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struct trapframe *regs;
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const ucontext_t *ucp;
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int cs, eflags, error;
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int cs, eflags, error, ret;
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error = copyin(uap->sigcntxp, &uc, sizeof(uc));
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if (error != 0)
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@ -769,6 +774,9 @@ sigreturn(td, uap)
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return (EINVAL);
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}
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ret = set_fpcontext(td, &ucp->uc_mcontext);
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if (ret != 0)
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return (ret);
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bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
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}
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@ -929,10 +937,19 @@ exec_setregs(td, entry, stack, ps_strings)
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*/
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load_cr0(rcr0() | CR0_MP | CR0_TS);
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#ifdef DEV_NPX
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/* Initialize the npx (if any) for the current process. */
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npxinit(__INITIAL_NPXCW__);
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#endif
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/*
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* XXX the above load_cr0() also initializes it and is a layering
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* violation if NPX is configured. It drops the npx partially
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* and this would be fatal if we were interrupted now, and decided
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* to force the state to the pcb, and checked the invariant
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* (CR0_TS clear) if and only if PCPU_GET(fpcurthread) != NULL).
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* ALL of this can happen except the check. The check used to
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* happen and be fatal later when we didn't complete the drop
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* before returning to user mode. This should be fixed properly
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* soon.
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*/
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fpstate_drop(td);
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/*
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* XXX - Linux emulator
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@ -2074,8 +2091,6 @@ fill_fpregs_xmm(sv_xmm, sv_87)
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/* FPU registers */
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for (i = 0; i < 8; ++i)
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sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
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sv_87->sv_ex_sw = sv_xmm->sv_ex_sw;
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}
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static void
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@ -2100,8 +2115,6 @@ set_fpregs_xmm(sv_87, sv_xmm)
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/* FPU registers */
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for (i = 0; i < 8; ++i)
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sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
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sv_xmm->sv_ex_sw = sv_87->sv_ex_sw;
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}
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#endif /* CPU_ENABLE_SSE */
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@ -2133,6 +2146,185 @@ set_fpregs(struct thread *td, struct fpreg *fpregs)
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return (0);
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}
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/*
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* Get machine context.
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*/
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void
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get_mcontext(struct thread *td, mcontext_t *mcp)
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{
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struct trapframe *tp;
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tp = td->td_frame;
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mcp->mc_onstack = sigonstack(tp->tf_esp);
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mcp->mc_gs = td->td_pcb->pcb_gs;
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mcp->mc_fs = tp->tf_fs;
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mcp->mc_es = tp->tf_es;
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mcp->mc_ds = tp->tf_ds;
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mcp->mc_edi = tp->tf_edi;
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mcp->mc_esi = tp->tf_esi;
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mcp->mc_ebp = tp->tf_ebp;
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mcp->mc_isp = tp->tf_isp;
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mcp->mc_ebx = tp->tf_ebx;
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mcp->mc_edx = tp->tf_edx;
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mcp->mc_ecx = tp->tf_ecx;
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mcp->mc_eax = tp->tf_eax;
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mcp->mc_eip = tp->tf_eip;
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mcp->mc_cs = tp->tf_cs;
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mcp->mc_eflags = tp->tf_eflags;
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mcp->mc_esp = tp->tf_esp;
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mcp->mc_ss = tp->tf_ss;
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mcp->mc_len = sizeof(*mcp);
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get_fpcontext(td, mcp);
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}
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/*
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* Set machine context.
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*
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* However, we don't set any but the user modifyable flags, and
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* we we won't touch the cs selector.
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*/
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int
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set_mcontext(struct thread *td, const mcontext_t *mcp)
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{
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struct trapframe *tp;
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int ret;
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int eflags;
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tp = td->td_frame;
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if (mcp->mc_len != sizeof(*mcp))
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return (EINVAL);
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eflags = (mcp->mc_eflags & PSL_USERCHANGE) |
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(tp->tf_eflags & ~PSL_USERCHANGE);
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if ((ret = set_fpcontext(td, mcp)) == 0) {
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tp->tf_fs = mcp->mc_fs;
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tp->tf_es = mcp->mc_es;
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tp->tf_ds = mcp->mc_ds;
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tp->tf_edi = mcp->mc_edi;
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tp->tf_esi = mcp->mc_esi;
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tp->tf_ebp = mcp->mc_ebp;
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tp->tf_ebx = mcp->mc_ebx;
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tp->tf_edx = mcp->mc_edx;
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tp->tf_ecx = mcp->mc_ecx;
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tp->tf_eax = mcp->mc_eax;
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tp->tf_eip = mcp->mc_eip;
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tp->tf_eflags = eflags;
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tp->tf_esp = mcp->mc_esp;
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tp->tf_ss = mcp->mc_ss;
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td->td_pcb->pcb_gs = mcp->mc_gs;
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ret = 0;
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}
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return (ret);
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}
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static void
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get_fpcontext(struct thread *td, mcontext_t *mcp)
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{
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#ifndef DEV_NPX
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mcp->mc_fpformat = _MC_FPFMT_NODEV;
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mcp->mc_ownedfp = _MC_FPOWNED_NONE;
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#else
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union savefpu *addr;
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/*
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* XXX mc_fpstate might be misaligned, since its declaration is not
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* unportabilized using __attribute__((aligned(16))) like the
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* declaration of struct savemm, and anyway, alignment doesn't work
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* for auto variables since we don't use gcc's pessimal stack
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* alignment. Work around this by abusing the spare fields after
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* mcp->mc_fpstate.
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*
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* XXX unpessimize most cases by only aligning when fxsave might be
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* called, although this requires knowing too much about
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* npxgetregs()'s internals.
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*/
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addr = (union savefpu *)&mcp->mc_fpstate;
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if (td == PCPU_GET(fpcurthread) &&
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#ifdef CPU_ENABLE_SSE
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cpu_fxsr &&
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#endif
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((uintptr_t)(void *)addr & 0xF)) {
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do
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addr = (void *)((char *)addr + 4);
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while ((uintptr_t)(void *)addr & 0xF);
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}
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mcp->mc_ownedfp = npxgetregs(td, addr);
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if (addr != (union savefpu *)&mcp->mc_fpstate) {
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bcopy(addr, &mcp->mc_fpstate, sizeof(mcp->mc_fpstate));
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bzero(&mcp->mc_spare2, sizeof(mcp->mc_spare2));
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}
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mcp->mc_fpformat = npxformat();
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#endif
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}
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static int
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set_fpcontext(struct thread *td, const mcontext_t *mcp)
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{
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union savefpu *addr;
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if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
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return (0);
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else if (mcp->mc_fpformat != _MC_FPFMT_387 &&
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mcp->mc_fpformat != _MC_FPFMT_XMM)
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return (EINVAL);
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else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE)
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/* We don't care what state is left in the FPU or PCB. */
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fpstate_drop(td);
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else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
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mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
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/* XXX align as above. */
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addr = (union savefpu *)&mcp->mc_fpstate;
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if (td == PCPU_GET(fpcurthread) &&
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#ifdef CPU_ENABLE_SSE
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cpu_fxsr &&
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#endif
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((uintptr_t)(void *)addr & 0xF)) {
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do
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addr = (void *)((char *)addr + 4);
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while ((uintptr_t)(void *)addr & 0xF);
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bcopy(&mcp->mc_fpstate, addr, sizeof(mcp->mc_fpstate));
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}
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#ifdef DEV_NPX
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/*
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* XXX we violate the dubious requirement that npxsetregs()
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* be called with interrupts disabled.
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*/
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npxsetregs(td, addr);
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#endif
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/*
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* Don't bother putting things back where they were in the
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* misaligned case, since we know that the caller won't use
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* them again.
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*/
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} else
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return (EINVAL);
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return (0);
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}
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static void
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fpstate_drop(struct thread *td)
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{
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register_t s;
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s = intr_disable();
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#ifdef DEV_NPX
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if (PCPU_GET(fpcurthread) == td)
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npxdrop();
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#endif
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/*
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* XXX force a full drop of the npx. The above only drops it if we
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* owned it. npxgetregs() has the same bug in the !cpu_fxsr case.
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*
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* XXX I don't much like npxgetregs()'s semantics of doing a full
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* drop. Dropping only to the pcb matches fnsave's behaviour.
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* We only need to drop to !PCB_INITDONE in sendsig(). But
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* sendsig() is the only caller of npxgetregs()... perhaps we just
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* have too many layers.
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*/
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curthread->td_pcb->pcb_flags &= ~PCB_NPXINITDONE;
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intr_restore(s);
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}
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int
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fill_dbregs(struct thread *td, struct dbreg *dbregs)
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{
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@ -143,6 +143,9 @@ extern void initializecpu(void);
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#endif
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static void cpu_startup(void *);
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static void fpstate_drop(struct thread *td);
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static void get_fpcontext(struct thread *td, mcontext_t *mcp);
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static int set_fpcontext(struct thread *td, const mcontext_t *mcp);
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#ifdef CPU_ENABLE_SSE
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static void set_fpregs_xmm(struct save87 *, struct savexmm *);
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static void fill_fpregs_xmm(struct savexmm *, struct save87 *);
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@ -460,8 +463,10 @@ sendsig(catcher, sig, mask, code)
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? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
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sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
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sf.sf_uc.uc_mcontext.mc_gs = rgs();
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sf.sf_uc.uc_mcontext.mc_flags = __UC_MC_VALID; /* no FP regs */
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bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
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sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
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get_fpcontext(td, &sf.sf_uc.uc_mcontext);
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fpstate_drop(td);
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/* Allocate space for the signal handler context. */
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if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack &&
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@ -695,7 +700,7 @@ sigreturn(td, uap)
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struct proc *p = td->td_proc;
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struct trapframe *regs;
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const ucontext_t *ucp;
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int cs, eflags, error;
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int cs, eflags, error, ret;
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error = copyin(uap->sigcntxp, &uc, sizeof(uc));
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if (error != 0)
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@ -769,6 +774,9 @@ sigreturn(td, uap)
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return (EINVAL);
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}
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ret = set_fpcontext(td, &ucp->uc_mcontext);
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if (ret != 0)
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return (ret);
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bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
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}
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@ -929,10 +937,19 @@ exec_setregs(td, entry, stack, ps_strings)
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*/
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load_cr0(rcr0() | CR0_MP | CR0_TS);
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#ifdef DEV_NPX
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/* Initialize the npx (if any) for the current process. */
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npxinit(__INITIAL_NPXCW__);
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#endif
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/*
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* XXX the above load_cr0() also initializes it and is a layering
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* violation if NPX is configured. It drops the npx partially
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* and this would be fatal if we were interrupted now, and decided
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* to force the state to the pcb, and checked the invariant
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* (CR0_TS clear) if and only if PCPU_GET(fpcurthread) != NULL).
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* ALL of this can happen except the check. The check used to
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* happen and be fatal later when we didn't complete the drop
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* before returning to user mode. This should be fixed properly
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* soon.
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*/
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fpstate_drop(td);
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/*
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* XXX - Linux emulator
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@ -2074,8 +2091,6 @@ fill_fpregs_xmm(sv_xmm, sv_87)
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/* FPU registers */
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for (i = 0; i < 8; ++i)
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sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
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sv_87->sv_ex_sw = sv_xmm->sv_ex_sw;
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}
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static void
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@ -2100,8 +2115,6 @@ set_fpregs_xmm(sv_87, sv_xmm)
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/* FPU registers */
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for (i = 0; i < 8; ++i)
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sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
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sv_xmm->sv_ex_sw = sv_87->sv_ex_sw;
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}
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#endif /* CPU_ENABLE_SSE */
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@ -2133,6 +2146,185 @@ set_fpregs(struct thread *td, struct fpreg *fpregs)
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return (0);
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}
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/*
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* Get machine context.
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*/
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void
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get_mcontext(struct thread *td, mcontext_t *mcp)
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{
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struct trapframe *tp;
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tp = td->td_frame;
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mcp->mc_onstack = sigonstack(tp->tf_esp);
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mcp->mc_gs = td->td_pcb->pcb_gs;
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mcp->mc_fs = tp->tf_fs;
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mcp->mc_es = tp->tf_es;
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mcp->mc_ds = tp->tf_ds;
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mcp->mc_edi = tp->tf_edi;
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mcp->mc_esi = tp->tf_esi;
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mcp->mc_ebp = tp->tf_ebp;
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mcp->mc_isp = tp->tf_isp;
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mcp->mc_ebx = tp->tf_ebx;
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mcp->mc_edx = tp->tf_edx;
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mcp->mc_ecx = tp->tf_ecx;
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mcp->mc_eax = tp->tf_eax;
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mcp->mc_eip = tp->tf_eip;
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mcp->mc_cs = tp->tf_cs;
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mcp->mc_eflags = tp->tf_eflags;
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mcp->mc_esp = tp->tf_esp;
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mcp->mc_ss = tp->tf_ss;
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mcp->mc_len = sizeof(*mcp);
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get_fpcontext(td, mcp);
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}
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/*
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* Set machine context.
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*
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* However, we don't set any but the user modifyable flags, and
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* we we won't touch the cs selector.
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*/
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int
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set_mcontext(struct thread *td, const mcontext_t *mcp)
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{
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struct trapframe *tp;
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int ret;
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int eflags;
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tp = td->td_frame;
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if (mcp->mc_len != sizeof(*mcp))
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return (EINVAL);
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eflags = (mcp->mc_eflags & PSL_USERCHANGE) |
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(tp->tf_eflags & ~PSL_USERCHANGE);
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if ((ret = set_fpcontext(td, mcp)) == 0) {
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tp->tf_fs = mcp->mc_fs;
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tp->tf_es = mcp->mc_es;
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tp->tf_ds = mcp->mc_ds;
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tp->tf_edi = mcp->mc_edi;
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tp->tf_esi = mcp->mc_esi;
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tp->tf_ebp = mcp->mc_ebp;
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tp->tf_ebx = mcp->mc_ebx;
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tp->tf_edx = mcp->mc_edx;
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tp->tf_ecx = mcp->mc_ecx;
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tp->tf_eax = mcp->mc_eax;
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tp->tf_eip = mcp->mc_eip;
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tp->tf_eflags = eflags;
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tp->tf_esp = mcp->mc_esp;
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tp->tf_ss = mcp->mc_ss;
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td->td_pcb->pcb_gs = mcp->mc_gs;
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ret = 0;
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}
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return (ret);
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}
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static void
|
||||
get_fpcontext(struct thread *td, mcontext_t *mcp)
|
||||
{
|
||||
#ifndef DEV_NPX
|
||||
mcp->mc_fpformat = _MC_FPFMT_NODEV;
|
||||
mcp->mc_ownedfp = _MC_FPOWNED_NONE;
|
||||
#else
|
||||
union savefpu *addr;
|
||||
|
||||
/*
|
||||
* XXX mc_fpstate might be misaligned, since its declaration is not
|
||||
* unportabilized using __attribute__((aligned(16))) like the
|
||||
* declaration of struct savemm, and anyway, alignment doesn't work
|
||||
* for auto variables since we don't use gcc's pessimal stack
|
||||
* alignment. Work around this by abusing the spare fields after
|
||||
* mcp->mc_fpstate.
|
||||
*
|
||||
* XXX unpessimize most cases by only aligning when fxsave might be
|
||||
* called, although this requires knowing too much about
|
||||
* npxgetregs()'s internals.
|
||||
*/
|
||||
addr = (union savefpu *)&mcp->mc_fpstate;
|
||||
if (td == PCPU_GET(fpcurthread) &&
|
||||
#ifdef CPU_ENABLE_SSE
|
||||
cpu_fxsr &&
|
||||
#endif
|
||||
((uintptr_t)(void *)addr & 0xF)) {
|
||||
do
|
||||
addr = (void *)((char *)addr + 4);
|
||||
while ((uintptr_t)(void *)addr & 0xF);
|
||||
}
|
||||
mcp->mc_ownedfp = npxgetregs(td, addr);
|
||||
if (addr != (union savefpu *)&mcp->mc_fpstate) {
|
||||
bcopy(addr, &mcp->mc_fpstate, sizeof(mcp->mc_fpstate));
|
||||
bzero(&mcp->mc_spare2, sizeof(mcp->mc_spare2));
|
||||
}
|
||||
mcp->mc_fpformat = npxformat();
|
||||
#endif
|
||||
}
|
||||
|
||||
static int
|
||||
set_fpcontext(struct thread *td, const mcontext_t *mcp)
|
||||
{
|
||||
union savefpu *addr;
|
||||
|
||||
if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
|
||||
return (0);
|
||||
else if (mcp->mc_fpformat != _MC_FPFMT_387 &&
|
||||
mcp->mc_fpformat != _MC_FPFMT_XMM)
|
||||
return (EINVAL);
|
||||
else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE)
|
||||
/* We don't care what state is left in the FPU or PCB. */
|
||||
fpstate_drop(td);
|
||||
else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
|
||||
mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
|
||||
/* XXX align as above. */
|
||||
addr = (union savefpu *)&mcp->mc_fpstate;
|
||||
if (td == PCPU_GET(fpcurthread) &&
|
||||
#ifdef CPU_ENABLE_SSE
|
||||
cpu_fxsr &&
|
||||
#endif
|
||||
((uintptr_t)(void *)addr & 0xF)) {
|
||||
do
|
||||
addr = (void *)((char *)addr + 4);
|
||||
while ((uintptr_t)(void *)addr & 0xF);
|
||||
bcopy(&mcp->mc_fpstate, addr, sizeof(mcp->mc_fpstate));
|
||||
}
|
||||
#ifdef DEV_NPX
|
||||
/*
|
||||
* XXX we violate the dubious requirement that npxsetregs()
|
||||
* be called with interrupts disabled.
|
||||
*/
|
||||
npxsetregs(td, addr);
|
||||
#endif
|
||||
/*
|
||||
* Don't bother putting things back where they were in the
|
||||
* misaligned case, since we know that the caller won't use
|
||||
* them again.
|
||||
*/
|
||||
} else
|
||||
return (EINVAL);
|
||||
return (0);
|
||||
}
|
||||
|
||||
static void
|
||||
fpstate_drop(struct thread *td)
|
||||
{
|
||||
register_t s;
|
||||
|
||||
s = intr_disable();
|
||||
#ifdef DEV_NPX
|
||||
if (PCPU_GET(fpcurthread) == td)
|
||||
npxdrop();
|
||||
#endif
|
||||
/*
|
||||
* XXX force a full drop of the npx. The above only drops it if we
|
||||
* owned it. npxgetregs() has the same bug in the !cpu_fxsr case.
|
||||
*
|
||||
* XXX I don't much like npxgetregs()'s semantics of doing a full
|
||||
* drop. Dropping only to the pcb matches fnsave's behaviour.
|
||||
* We only need to drop to !PCB_INITDONE in sendsig(). But
|
||||
* sendsig() is the only caller of npxgetregs()... perhaps we just
|
||||
* have too many layers.
|
||||
*/
|
||||
curthread->td_pcb->pcb_flags &= ~PCB_NPXINITDONE;
|
||||
intr_restore(s);
|
||||
}
|
||||
|
||||
int
|
||||
fill_dbregs(struct thread *td, struct dbreg *dbregs)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user