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ab419fd8a0
The value previously chosen overlaps GUSA_MASK.
Rename all DELAY_SLOT_* and GUSA_* defines to emphasize
that they are included in TB_FLAGs. Add aliases for the
FPSCR and SR bits that are included in TB_FLAGS, so that
we don't accidentally reassign those bits.
Fixes: 4da06fb306 ("target/sh4: Implement prctl_unalign_sigbus")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/856
Reviewed-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
340 lines
9.9 KiB
C
340 lines
9.9 KiB
C
/*
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* Emulation of Linux signals
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu.h"
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#include "user-internals.h"
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#include "signal-common.h"
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#include "linux-user/trace.h"
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/*
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* code and data structures from linux kernel:
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* include/asm-sh/sigcontext.h
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* arch/sh/kernel/signal.c
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*/
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struct target_sigcontext {
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target_ulong oldmask;
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/* CPU registers */
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target_ulong sc_gregs[16];
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target_ulong sc_pc;
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target_ulong sc_pr;
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target_ulong sc_sr;
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target_ulong sc_gbr;
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target_ulong sc_mach;
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target_ulong sc_macl;
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/* FPU registers */
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target_ulong sc_fpregs[16];
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target_ulong sc_xfpregs[16];
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unsigned int sc_fpscr;
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unsigned int sc_fpul;
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unsigned int sc_ownedfp;
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};
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struct target_sigframe
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{
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struct target_sigcontext sc;
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target_ulong extramask[TARGET_NSIG_WORDS-1];
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};
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struct target_ucontext {
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target_ulong tuc_flags;
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struct target_ucontext *tuc_link;
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target_stack_t tuc_stack;
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struct target_sigcontext tuc_mcontext;
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target_sigset_t tuc_sigmask; /* mask last for extensibility */
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};
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struct target_rt_sigframe
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{
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struct target_siginfo info;
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struct target_ucontext uc;
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};
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#define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */
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#define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) SH3/4 */
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static abi_ulong get_sigframe(struct target_sigaction *ka,
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unsigned long sp, size_t frame_size)
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{
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sp = target_sigsp(sp, ka);
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return (sp - frame_size) & -8ul;
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}
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/*
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* Notice when we're in the middle of a gUSA region and reset.
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* Note that this will only occur when #CF_PARALLEL is unset, as we
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* will translate such sequences differently in a parallel context.
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*/
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static void unwind_gusa(CPUSH4State *regs)
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{
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/* If the stack pointer is sufficiently negative, and we haven't
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completed the sequence, then reset to the entry to the region. */
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/* ??? The SH4 kernel checks for and address above 0xC0000000.
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However, the page mappings in qemu linux-user aren't as restricted
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and we wind up with the normal stack mapped above 0xF0000000.
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That said, there is no reason why the kernel should be allowing
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a gUSA region that spans 1GB. Use a tighter check here, for what
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can actually be enabled by the immediate move. */
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if (regs->gregs[15] >= -128u && regs->pc < regs->gregs[0]) {
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/* Reset the PC to before the gUSA region, as computed from
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R0 = region end, SP = -(region size), plus one more for the
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insn that actually initializes SP to the region size. */
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regs->pc = regs->gregs[0] + regs->gregs[15] - 2;
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/* Reset the SP to the saved version in R1. */
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regs->gregs[15] = regs->gregs[1];
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}
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}
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static void setup_sigcontext(struct target_sigcontext *sc,
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CPUSH4State *regs, unsigned long mask)
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{
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int i;
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#define COPY(x) __put_user(regs->x, &sc->sc_##x)
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COPY(gregs[0]); COPY(gregs[1]);
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COPY(gregs[2]); COPY(gregs[3]);
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COPY(gregs[4]); COPY(gregs[5]);
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COPY(gregs[6]); COPY(gregs[7]);
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COPY(gregs[8]); COPY(gregs[9]);
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COPY(gregs[10]); COPY(gregs[11]);
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COPY(gregs[12]); COPY(gregs[13]);
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COPY(gregs[14]); COPY(gregs[15]);
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COPY(gbr); COPY(mach);
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COPY(macl); COPY(pr);
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COPY(sr); COPY(pc);
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#undef COPY
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for (i=0; i<16; i++) {
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__put_user(regs->fregs[i], &sc->sc_fpregs[i]);
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}
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__put_user(regs->fpscr, &sc->sc_fpscr);
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__put_user(regs->fpul, &sc->sc_fpul);
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/* non-iBCS2 extensions.. */
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__put_user(mask, &sc->oldmask);
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}
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static void restore_sigcontext(CPUSH4State *regs, struct target_sigcontext *sc)
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{
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int i;
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#define COPY(x) __get_user(regs->x, &sc->sc_##x)
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COPY(gregs[0]); COPY(gregs[1]);
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COPY(gregs[2]); COPY(gregs[3]);
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COPY(gregs[4]); COPY(gregs[5]);
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COPY(gregs[6]); COPY(gregs[7]);
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COPY(gregs[8]); COPY(gregs[9]);
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COPY(gregs[10]); COPY(gregs[11]);
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COPY(gregs[12]); COPY(gregs[13]);
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COPY(gregs[14]); COPY(gregs[15]);
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COPY(gbr); COPY(mach);
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COPY(macl); COPY(pr);
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COPY(sr); COPY(pc);
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#undef COPY
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for (i=0; i<16; i++) {
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__get_user(regs->fregs[i], &sc->sc_fpregs[i]);
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}
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__get_user(regs->fpscr, &sc->sc_fpscr);
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__get_user(regs->fpul, &sc->sc_fpul);
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regs->tra = -1; /* disable syscall checks */
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regs->flags = 0;
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}
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void setup_frame(int sig, struct target_sigaction *ka,
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target_sigset_t *set, CPUSH4State *regs)
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{
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struct target_sigframe *frame;
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abi_ulong frame_addr;
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int i;
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unwind_gusa(regs);
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frame_addr = get_sigframe(ka, regs->gregs[15], sizeof(*frame));
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trace_user_setup_frame(regs, frame_addr);
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if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
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goto give_sigsegv;
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}
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setup_sigcontext(&frame->sc, regs, set->sig[0]);
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for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) {
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__put_user(set->sig[i + 1], &frame->extramask[i]);
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}
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/* Set up to return from userspace. If provided, use a stub
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already in userspace. */
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if (ka->sa_flags & TARGET_SA_RESTORER) {
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regs->pr = ka->sa_restorer;
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} else {
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regs->pr = default_sigreturn;
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}
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/* Set up registers for signal handler */
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regs->gregs[15] = frame_addr;
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regs->gregs[4] = sig; /* Arg for signal handler */
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regs->gregs[5] = 0;
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regs->gregs[6] = frame_addr += offsetof(typeof(*frame), sc);
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regs->pc = (unsigned long) ka->_sa_handler;
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regs->flags &= ~(TB_FLAG_DELAY_SLOT_MASK | TB_FLAG_GUSA_MASK);
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unlock_user_struct(frame, frame_addr, 1);
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return;
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give_sigsegv:
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unlock_user_struct(frame, frame_addr, 1);
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force_sigsegv(sig);
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}
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void setup_rt_frame(int sig, struct target_sigaction *ka,
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target_siginfo_t *info,
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target_sigset_t *set, CPUSH4State *regs)
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{
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struct target_rt_sigframe *frame;
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abi_ulong frame_addr;
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int i;
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unwind_gusa(regs);
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frame_addr = get_sigframe(ka, regs->gregs[15], sizeof(*frame));
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trace_user_setup_rt_frame(regs, frame_addr);
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if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
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goto give_sigsegv;
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}
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tswap_siginfo(&frame->info, info);
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/* Create the ucontext. */
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__put_user(0, &frame->uc.tuc_flags);
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__put_user(0, (unsigned long *)&frame->uc.tuc_link);
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target_save_altstack(&frame->uc.tuc_stack, regs);
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setup_sigcontext(&frame->uc.tuc_mcontext,
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regs, set->sig[0]);
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for(i = 0; i < TARGET_NSIG_WORDS; i++) {
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__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
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}
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/* Set up to return from userspace. If provided, use a stub
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already in userspace. */
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if (ka->sa_flags & TARGET_SA_RESTORER) {
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regs->pr = ka->sa_restorer;
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} else {
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regs->pr = default_rt_sigreturn;
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}
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/* Set up registers for signal handler */
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regs->gregs[15] = frame_addr;
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regs->gregs[4] = sig; /* Arg for signal handler */
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regs->gregs[5] = frame_addr + offsetof(typeof(*frame), info);
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regs->gregs[6] = frame_addr + offsetof(typeof(*frame), uc);
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regs->pc = (unsigned long) ka->_sa_handler;
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regs->flags &= ~(TB_FLAG_DELAY_SLOT_MASK | TB_FLAG_GUSA_MASK);
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unlock_user_struct(frame, frame_addr, 1);
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return;
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give_sigsegv:
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unlock_user_struct(frame, frame_addr, 1);
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force_sigsegv(sig);
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}
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long do_sigreturn(CPUSH4State *regs)
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{
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struct target_sigframe *frame;
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abi_ulong frame_addr;
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sigset_t blocked;
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target_sigset_t target_set;
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int i;
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frame_addr = regs->gregs[15];
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trace_user_do_sigreturn(regs, frame_addr);
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if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
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goto badframe;
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}
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__get_user(target_set.sig[0], &frame->sc.oldmask);
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for(i = 1; i < TARGET_NSIG_WORDS; i++) {
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__get_user(target_set.sig[i], &frame->extramask[i - 1]);
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}
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target_to_host_sigset_internal(&blocked, &target_set);
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set_sigmask(&blocked);
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restore_sigcontext(regs, &frame->sc);
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unlock_user_struct(frame, frame_addr, 0);
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return -QEMU_ESIGRETURN;
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badframe:
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unlock_user_struct(frame, frame_addr, 0);
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force_sig(TARGET_SIGSEGV);
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return -QEMU_ESIGRETURN;
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}
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long do_rt_sigreturn(CPUSH4State *regs)
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{
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struct target_rt_sigframe *frame;
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abi_ulong frame_addr;
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sigset_t blocked;
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frame_addr = regs->gregs[15];
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trace_user_do_rt_sigreturn(regs, frame_addr);
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if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
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goto badframe;
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}
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target_to_host_sigset(&blocked, &frame->uc.tuc_sigmask);
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set_sigmask(&blocked);
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restore_sigcontext(regs, &frame->uc.tuc_mcontext);
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target_restore_altstack(&frame->uc.tuc_stack, regs);
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unlock_user_struct(frame, frame_addr, 0);
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return -QEMU_ESIGRETURN;
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badframe:
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unlock_user_struct(frame, frame_addr, 0);
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force_sig(TARGET_SIGSEGV);
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return -QEMU_ESIGRETURN;
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}
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void setup_sigtramp(abi_ulong sigtramp_page)
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{
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uint16_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 2 * 6, 0);
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assert(tramp != NULL);
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default_sigreturn = sigtramp_page;
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__put_user(MOVW(2), &tramp[0]);
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__put_user(TRAP_NOARG, &tramp[1]);
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__put_user(TARGET_NR_sigreturn, &tramp[2]);
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default_rt_sigreturn = sigtramp_page + 6;
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__put_user(MOVW(2), &tramp[3]);
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__put_user(TRAP_NOARG, &tramp[4]);
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__put_user(TARGET_NR_rt_sigreturn, &tramp[5]);
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unlock_user(tramp, sigtramp_page, 2 * 6);
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}
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