linux-user: ppc signal handling
Implement setup_{,rt_}frame and do_{,rt_}sigreturn for PPC 32-bit. Use
the same TARGET_QEMU_ESIGRETURN hack as for MIPS to avoid clobbering
register state on a sigreturn.
Signed-off-by: Nathan Froyd <froydnj@codesourcery.com>
Signed-off-by: malc <av1474@comtv.ru>
This commit is contained in:
Nathan Froyd
malc
parent
c29b735c50
commit
bcd4933a23
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@ -1461,6 +1461,11 @@ void cpu_loop(CPUPPCState *env)
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ret = do_syscall(env, env->gpr[0], env->gpr[3], env->gpr[4],
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env->gpr[5], env->gpr[6], env->gpr[7],
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env->gpr[8]);
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if (ret == (uint32_t)(-TARGET_QEMU_ESIGRETURN)) {
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/* Returning from a successful sigreturn syscall.
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Avoid corrupting register state. */
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break;
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}
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if (ret > (uint32_t)(-515)) {
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env->crf[0] |= 0x1;
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ret = -ret;
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@ -51,6 +51,9 @@ struct target_revectored_struct {
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abi_ulong __map[8]; /* 256 bits */
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};
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/* Nasty hack: define a fake errno value for use by sigreturn. */
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#define TARGET_QEMU_ESIGRETURN 255
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/*
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* flags masks
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*/
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@ -3182,6 +3182,602 @@ long do_rt_sigreturn(CPUState *env)
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return -TARGET_ENOSYS;
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}
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#elif defined(TARGET_PPC) && !defined(TARGET_PPC64)
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/* FIXME: Many of the structures are defined for both PPC and PPC64, but
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the signal handling is different enough that we haven't implemented
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support for PPC64 yet. Hence the restriction above.
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There are various #if'd blocks for code for TARGET_PPC64. These
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blocks should go away so that we can successfully run 32-bit and
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64-bit binaries on a QEMU configured for PPC64. */
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/* Size of dummy stack frame allocated when calling signal handler.
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See arch/powerpc/include/asm/ptrace.h. */
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#if defined(TARGET_PPC64)
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#define SIGNAL_FRAMESIZE 128
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#else
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#define SIGNAL_FRAMESIZE 64
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#endif
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/* See arch/powerpc/include/asm/sigcontext.h. */
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struct target_sigcontext {
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target_ulong _unused[4];
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int32_t signal;
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#if defined(TARGET_PPC64)
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int32_t pad0;
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#endif
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target_ulong handler;
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target_ulong oldmask;
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target_ulong regs; /* struct pt_regs __user * */
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/* TODO: PPC64 includes extra bits here. */
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};
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/* Indices for target_mcontext.mc_gregs, below.
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See arch/powerpc/include/asm/ptrace.h for details. */
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enum {
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TARGET_PT_R0 = 0,
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TARGET_PT_R1 = 1,
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TARGET_PT_R2 = 2,
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TARGET_PT_R3 = 3,
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TARGET_PT_R4 = 4,
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TARGET_PT_R5 = 5,
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TARGET_PT_R6 = 6,
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TARGET_PT_R7 = 7,
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TARGET_PT_R8 = 8,
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TARGET_PT_R9 = 9,
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TARGET_PT_R10 = 10,
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TARGET_PT_R11 = 11,
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TARGET_PT_R12 = 12,
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TARGET_PT_R13 = 13,
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TARGET_PT_R14 = 14,
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TARGET_PT_R15 = 15,
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TARGET_PT_R16 = 16,
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TARGET_PT_R17 = 17,
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TARGET_PT_R18 = 18,
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TARGET_PT_R19 = 19,
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TARGET_PT_R20 = 20,
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TARGET_PT_R21 = 21,
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TARGET_PT_R22 = 22,
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TARGET_PT_R23 = 23,
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TARGET_PT_R24 = 24,
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TARGET_PT_R25 = 25,
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TARGET_PT_R26 = 26,
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TARGET_PT_R27 = 27,
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TARGET_PT_R28 = 28,
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TARGET_PT_R29 = 29,
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TARGET_PT_R30 = 30,
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TARGET_PT_R31 = 31,
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TARGET_PT_NIP = 32,
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TARGET_PT_MSR = 33,
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TARGET_PT_ORIG_R3 = 34,
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TARGET_PT_CTR = 35,
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TARGET_PT_LNK = 36,
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TARGET_PT_XER = 37,
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TARGET_PT_CCR = 38,
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/* Yes, there are two registers with #39. One is 64-bit only. */
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TARGET_PT_MQ = 39,
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TARGET_PT_SOFTE = 39,
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TARGET_PT_TRAP = 40,
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TARGET_PT_DAR = 41,
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TARGET_PT_DSISR = 42,
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TARGET_PT_RESULT = 43,
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TARGET_PT_REGS_COUNT = 44
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};
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/* See arch/powerpc/include/asm/ucontext.h. Only used for 32-bit PPC;
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on 64-bit PPC, sigcontext and mcontext are one and the same. */
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struct target_mcontext {
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target_ulong mc_gregs[48];
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/* Includes fpscr. */
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uint64_t mc_fregs[33];
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target_ulong mc_pad[2];
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/* We need to handle Altivec and SPE at the same time, which no
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kernel needs to do. Fortunately, the kernel defines this bit to
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be Altivec-register-large all the time, rather than trying to
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twiddle it based on the specific platform. */
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union {
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/* SPE vector registers. One extra for SPEFSCR. */
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uint32_t spe[33];
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/* Altivec vector registers. The packing of VSCR and VRSAVE
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varies depending on whether we're PPC64 or not: PPC64 splits
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them apart; PPC32 stuffs them together. */
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#if defined(TARGET_PPC64)
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#define NVRREG 34
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#else
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#define NVRREG 33
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#endif
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ppc_avr_t altivec[NVRREG];
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#undef NVRREG
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} mc_vregs __attribute__((__aligned__(16)));
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};
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struct target_ucontext {
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target_ulong uc_flags;
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target_ulong uc_link; /* struct ucontext __user * */
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struct target_sigaltstack uc_stack;
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#if !defined(TARGET_PPC64)
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int32_t uc_pad[7];
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target_ulong uc_regs; /* struct mcontext __user *
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points to uc_mcontext field */
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#endif
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target_sigset_t uc_sigmask;
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#if defined(TARGET_PPC64)
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target_sigset_t unused[15]; /* Allow for uc_sigmask growth */
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struct target_sigcontext uc_mcontext;
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#else
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int32_t uc_maskext[30];
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int32_t uc_pad2[3];
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struct target_mcontext uc_mcontext;
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#endif
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};
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/* See arch/powerpc/kernel/signal_32.c. */
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struct target_sigframe {
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struct target_sigcontext sctx;
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struct target_mcontext mctx;
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int32_t abigap[56];
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};
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struct target_rt_sigframe {
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struct target_siginfo info;
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struct target_ucontext uc;
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int32_t abigap[56];
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};
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/* We use the mc_pad field for the signal return trampoline. */
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#define tramp mc_pad
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/* See arch/powerpc/kernel/signal.c. */
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static target_ulong get_sigframe(struct target_sigaction *ka,
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CPUState *env,
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int frame_size)
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{
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target_ulong oldsp, newsp;
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oldsp = env->gpr[1];
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if ((ka->sa_flags & TARGET_SA_ONSTACK) &&
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(sas_ss_flags(oldsp))) {
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oldsp = (target_sigaltstack_used.ss_sp
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+ target_sigaltstack_used.ss_size);
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}
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newsp = (oldsp - frame_size) & ~0xFUL;
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return newsp;
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}
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static int save_user_regs(CPUState *env, struct target_mcontext *frame,
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int sigret)
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{
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target_ulong msr = env->msr;
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int i;
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target_ulong ccr = 0;
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/* In general, the kernel attempts to be intelligent about what it
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needs to save for Altivec/FP/SPE registers. We don't care that
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much, so we just go ahead and save everything. */
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/* Save general registers. */
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for (i = 0; i < ARRAY_SIZE(env->gpr); i++) {
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if (__put_user(env->gpr[i], &frame->mc_gregs[i])) {
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return 1;
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}
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}
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if (__put_user(env->nip, &frame->mc_gregs[TARGET_PT_NIP])
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|| __put_user(env->ctr, &frame->mc_gregs[TARGET_PT_CTR])
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|| __put_user(env->lr, &frame->mc_gregs[TARGET_PT_LNK])
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|| __put_user(env->xer, &frame->mc_gregs[TARGET_PT_XER]))
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return 1;
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for (i = 0; i < ARRAY_SIZE(env->crf); i++) {
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ccr |= env->crf[i] << (32 - ((i + 1) * 4));
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}
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if (__put_user(ccr, &frame->mc_gregs[TARGET_PT_CCR]))
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return 1;
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/* Save Altivec registers if necessary. */
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if (env->insns_flags & PPC_ALTIVEC) {
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for (i = 0; i < ARRAY_SIZE(env->avr); i++) {
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ppc_avr_t *avr = &env->avr[i];
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ppc_avr_t *vreg = &frame->mc_vregs.altivec[i];
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if (__put_user(avr->u64[0], &vreg->u64[0]) ||
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__put_user(avr->u64[1], &vreg->u64[1])) {
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return 1;
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}
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}
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/* Set MSR_VR in the saved MSR value to indicate that
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frame->mc_vregs contains valid data. */
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msr |= MSR_VR;
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if (__put_user((uint32_t)env->spr[SPR_VRSAVE],
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&frame->mc_vregs.altivec[32].u32[3]))
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return 1;
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}
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/* Save floating point registers. */
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if (env->insns_flags & PPC_FLOAT) {
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for (i = 0; i < ARRAY_SIZE(env->fpr); i++) {
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if (__put_user(env->fpr[i], &frame->mc_fregs[i])) {
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return 1;
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}
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}
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if (__put_user((uint64_t) env->fpscr, &frame->mc_fregs[32]))
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return 1;
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}
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/* Save SPE registers. The kernel only saves the high half. */
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if (env->insns_flags & PPC_SPE) {
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#if defined(TARGET_PPC64)
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for (i = 0; i < ARRAY_SIZE(env->gpr); i++) {
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if (__put_user(env->gpr[i] >> 32, &frame->mc_vregs.spe[i])) {
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return 1;
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}
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}
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#else
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for (i = 0; i < ARRAY_SIZE(env->gprh); i++) {
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if (__put_user(env->gprh[i], &frame->mc_vregs.spe[i])) {
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return 1;
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}
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}
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#endif
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/* Set MSR_SPE in the saved MSR value to indicate that
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frame->mc_vregs contains valid data. */
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msr |= MSR_SPE;
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if (__put_user(env->spe_fscr, &frame->mc_vregs.spe[32]))
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return 1;
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}
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/* Store MSR. */
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if (__put_user(msr, &frame->mc_gregs[TARGET_PT_MSR]))
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return 1;
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/* Set up the sigreturn trampoline: li r0,sigret; sc. */
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if (sigret) {
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if (__put_user(0x38000000UL | sigret, &frame->tramp[0]) ||
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__put_user(0x44000002UL, &frame->tramp[1])) {
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return 1;
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}
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}
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return 0;
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}
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static int restore_user_regs(CPUState *env,
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struct target_mcontext *frame, int sig)
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{
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target_ulong save_r2 = 0;
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target_ulong msr;
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target_ulong ccr;
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int i;
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if (!sig) {
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save_r2 = env->gpr[2];
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}
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/* Restore general registers. */
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for (i = 0; i < ARRAY_SIZE(env->gpr); i++) {
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if (__get_user(env->gpr[i], &frame->mc_gregs[i])) {
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return 1;
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}
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}
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if (__get_user(env->nip, &frame->mc_gregs[TARGET_PT_NIP])
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|| __get_user(env->ctr, &frame->mc_gregs[TARGET_PT_CTR])
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|| __get_user(env->lr, &frame->mc_gregs[TARGET_PT_LNK])
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|| __get_user(env->xer, &frame->mc_gregs[TARGET_PT_XER]))
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return 1;
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if (__get_user(ccr, &frame->mc_gregs[TARGET_PT_CCR]))
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return 1;
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for (i = 0; i < ARRAY_SIZE(env->crf); i++) {
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env->crf[i] = (ccr >> (32 - ((i + 1) * 4))) & 0xf;
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}
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if (!sig) {
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env->gpr[2] = save_r2;
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}
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/* Restore MSR. */
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if (__get_user(msr, &frame->mc_gregs[TARGET_PT_MSR]))
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return 1;
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/* If doing signal return, restore the previous little-endian mode. */
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if (sig)
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env->msr = (env->msr & ~MSR_LE) | (msr & MSR_LE);
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/* Restore Altivec registers if necessary. */
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if (env->insns_flags & PPC_ALTIVEC) {
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for (i = 0; i < ARRAY_SIZE(env->avr); i++) {
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ppc_avr_t *avr = &env->avr[i];
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ppc_avr_t *vreg = &frame->mc_vregs.altivec[i];
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if (__get_user(avr->u64[0], &vreg->u64[0]) ||
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__get_user(avr->u64[1], &vreg->u64[1])) {
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return 1;
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}
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}
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/* Set MSR_VEC in the saved MSR value to indicate that
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frame->mc_vregs contains valid data. */
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if (__get_user(env->spr[SPR_VRSAVE],
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(target_ulong *)(&frame->mc_vregs.altivec[32].u32[3])))
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return 1;
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}
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/* Restore floating point registers. */
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if (env->insns_flags & PPC_FLOAT) {
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uint64_t fpscr;
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for (i = 0; i < ARRAY_SIZE(env->fpr); i++) {
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if (__get_user(env->fpr[i], &frame->mc_fregs[i])) {
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return 1;
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}
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}
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if (__get_user(fpscr, &frame->mc_fregs[32]))
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return 1;
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env->fpscr = (uint32_t) fpscr;
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}
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/* Save SPE registers. The kernel only saves the high half. */
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if (env->insns_flags & PPC_SPE) {
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#if defined(TARGET_PPC64)
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for (i = 0; i < ARRAY_SIZE(env->gpr); i++) {
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uint32_t hi;
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if (__get_user(hi, &frame->mc_vregs.spe[i])) {
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return 1;
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}
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env->gpr[i] = ((uint64_t)hi << 32) | ((uint32_t) env->gpr[i]);
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}
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#else
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for (i = 0; i < ARRAY_SIZE(env->gprh); i++) {
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if (__get_user(env->gprh[i], &frame->mc_vregs.spe[i])) {
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return 1;
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}
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}
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#endif
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if (__get_user(env->spe_fscr, &frame->mc_vregs.spe[32]))
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return 1;
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}
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return 0;
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}
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static void setup_frame(int sig, struct target_sigaction *ka,
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target_sigset_t *set, CPUState *env)
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{
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struct target_sigframe *frame;
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struct target_sigcontext *sc;
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target_ulong frame_addr, newsp;
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int err = 0;
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int signal;
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frame_addr = get_sigframe(ka, env, sizeof(*frame));
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if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 1))
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goto sigsegv;
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sc = &frame->sctx;
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signal = current_exec_domain_sig(sig);
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err |= __put_user(h2g(ka->_sa_handler), &sc->handler);
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err |= __put_user(set->sig[0], &sc->oldmask);
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#if defined(TARGET_PPC64)
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err |= __put_user(set->sig[0] >> 32, &sc->_unused[3]);
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#else
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err |= __put_user(set->sig[1], &sc->_unused[3]);
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#endif
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err |= __put_user(h2g(&frame->mctx), &sc->regs);
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err |= __put_user(sig, &sc->signal);
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/* Save user regs. */
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err |= save_user_regs(env, &frame->mctx, TARGET_NR_sigreturn);
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/* The kernel checks for the presence of a VDSO here. We don't
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emulate a vdso, so use a sigreturn system call. */
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env->lr = (target_ulong) h2g(frame->mctx.tramp);
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/* Turn off all fp exceptions. */
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env->fpscr = 0;
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/* Create a stack frame for the caller of the handler. */
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newsp = frame_addr - SIGNAL_FRAMESIZE;
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err |= __put_user(env->gpr[1], (target_ulong *)(uintptr_t) newsp);
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if (err)
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goto sigsegv;
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/* Set up registers for signal handler. */
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env->gpr[1] = newsp;
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env->gpr[3] = signal;
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env->gpr[4] = (target_ulong) h2g(sc);
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env->nip = (target_ulong) ka->_sa_handler;
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/* Signal handlers are entered in big-endian mode. */
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env->msr &= ~MSR_LE;
|
||||
|
||||
unlock_user_struct(frame, frame_addr, 1);
|
||||
return;
|
||||
|
||||
sigsegv:
|
||||
unlock_user_struct(frame, frame_addr, 1);
|
||||
if (logfile)
|
||||
fprintf (logfile, "segfaulting from setup_frame\n");
|
||||
force_sig(SIGSEGV);
|
||||
}
|
||||
|
||||
static void setup_rt_frame(int sig, struct target_sigaction *ka,
|
||||
target_siginfo_t *info,
|
||||
target_sigset_t *set, CPUState *env)
|
||||
{
|
||||
struct target_rt_sigframe *rt_sf;
|
||||
struct target_mcontext *frame;
|
||||
target_ulong rt_sf_addr, newsp = 0;
|
||||
int i, err = 0;
|
||||
int signal;
|
||||
|
||||
rt_sf_addr = get_sigframe(ka, env, sizeof(*rt_sf));
|
||||
if (!lock_user_struct(VERIFY_WRITE, rt_sf, rt_sf_addr, 1))
|
||||
goto sigsegv;
|
||||
|
||||
signal = current_exec_domain_sig(sig);
|
||||
|
||||
err |= copy_siginfo_to_user(&rt_sf->info, info);
|
||||
|
||||
err |= __put_user(0, &rt_sf->uc.uc_flags);
|
||||
err |= __put_user(0, &rt_sf->uc.uc_link);
|
||||
err |= __put_user((target_ulong)target_sigaltstack_used.ss_sp,
|
||||
&rt_sf->uc.uc_stack.ss_sp);
|
||||
err |= __put_user(sas_ss_flags(env->gpr[1]),
|
||||
&rt_sf->uc.uc_stack.ss_flags);
|
||||
err |= __put_user(target_sigaltstack_used.ss_size,
|
||||
&rt_sf->uc.uc_stack.ss_size);
|
||||
err |= __put_user(h2g (&rt_sf->uc.uc_mcontext),
|
||||
&rt_sf->uc.uc_regs);
|
||||
for(i = 0; i < TARGET_NSIG_WORDS; i++) {
|
||||
err |= __put_user(set->sig[i], &rt_sf->uc.uc_sigmask.sig[i]);
|
||||
}
|
||||
|
||||
frame = &rt_sf->uc.uc_mcontext;
|
||||
err |= save_user_regs(env, frame, TARGET_NR_rt_sigreturn);
|
||||
|
||||
/* The kernel checks for the presence of a VDSO here. We don't
|
||||
emulate a vdso, so use a sigreturn system call. */
|
||||
env->lr = (target_ulong) h2g(frame->tramp);
|
||||
|
||||
/* Turn off all fp exceptions. */
|
||||
env->fpscr = 0;
|
||||
|
||||
/* Create a stack frame for the caller of the handler. */
|
||||
newsp = rt_sf_addr - (SIGNAL_FRAMESIZE + 16);
|
||||
err |= __put_user(env->gpr[1], (target_ulong *)(uintptr_t) newsp);
|
||||
|
||||
if (err)
|
||||
goto sigsegv;
|
||||
|
||||
/* Set up registers for signal handler. */
|
||||
env->gpr[1] = newsp;
|
||||
env->gpr[3] = (target_ulong) signal;
|
||||
env->gpr[4] = (target_ulong) h2g(&rt_sf->info);
|
||||
env->gpr[5] = (target_ulong) h2g(&rt_sf->uc);
|
||||
env->gpr[6] = (target_ulong) h2g(rt_sf);
|
||||
env->nip = (target_ulong) ka->_sa_handler;
|
||||
/* Signal handlers are entered in big-endian mode. */
|
||||
env->msr &= ~MSR_LE;
|
||||
|
||||
unlock_user_struct(rt_sf, rt_sf_addr, 1);
|
||||
return;
|
||||
|
||||
sigsegv:
|
||||
unlock_user_struct(rt_sf, rt_sf_addr, 1);
|
||||
if (logfile)
|
||||
fprintf (logfile, "segfaulting from setup_rt_frame\n");
|
||||
force_sig(SIGSEGV);
|
||||
|
||||
}
|
||||
|
||||
long do_sigreturn(CPUState *env)
|
||||
{
|
||||
struct target_sigcontext *sc = NULL;
|
||||
struct target_mcontext *sr = NULL;
|
||||
target_ulong sr_addr, sc_addr;
|
||||
sigset_t blocked;
|
||||
target_sigset_t set;
|
||||
|
||||
sc_addr = env->gpr[1] + SIGNAL_FRAMESIZE;
|
||||
if (!lock_user_struct(VERIFY_READ, sc, sc_addr, 1))
|
||||
goto sigsegv;
|
||||
|
||||
#if defined(TARGET_PPC64)
|
||||
set.sig[0] = sc->oldmask + ((long)(sc->_unused[3]) << 32);
|
||||
#else
|
||||
if(__get_user(set.sig[0], &sc->oldmask) ||
|
||||
__get_user(set.sig[1], &sc->_unused[3]))
|
||||
goto sigsegv;
|
||||
#endif
|
||||
target_to_host_sigset_internal(&blocked, &set);
|
||||
sigprocmask(SIG_SETMASK, &blocked, NULL);
|
||||
|
||||
if (__get_user(sr_addr, &sc->regs))
|
||||
goto sigsegv;
|
||||
if (!lock_user_struct(VERIFY_READ, sr, sr_addr, 1))
|
||||
goto sigsegv;
|
||||
if (restore_user_regs(env, sr, 1))
|
||||
goto sigsegv;
|
||||
|
||||
unlock_user_struct(sr, sr_addr, 1);
|
||||
unlock_user_struct(sc, sc_addr, 1);
|
||||
return -TARGET_QEMU_ESIGRETURN;
|
||||
|
||||
sigsegv:
|
||||
unlock_user_struct(sr, sr_addr, 1);
|
||||
unlock_user_struct(sc, sc_addr, 1);
|
||||
if (logfile)
|
||||
fprintf (logfile, "segfaulting from do_sigreturn\n");
|
||||
force_sig(SIGSEGV);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* See arch/powerpc/kernel/signal_32.c. */
|
||||
static int do_setcontext(struct target_ucontext *ucp, CPUState *env, int sig)
|
||||
{
|
||||
struct target_mcontext *mcp;
|
||||
target_ulong mcp_addr;
|
||||
sigset_t blocked;
|
||||
target_sigset_t set;
|
||||
|
||||
if (copy_from_user(&set, h2g(ucp) + offsetof(struct target_ucontext, uc_sigmask),
|
||||
sizeof (set)))
|
||||
return 1;
|
||||
|
||||
#if defined(TARGET_PPC64)
|
||||
fprintf (stderr, "do_setcontext: not implemented\n");
|
||||
return 0;
|
||||
#else
|
||||
if (__get_user(mcp_addr, &ucp->uc_regs))
|
||||
return 1;
|
||||
|
||||
if (!lock_user_struct(VERIFY_READ, mcp, mcp_addr, 1))
|
||||
return 1;
|
||||
|
||||
target_to_host_sigset_internal(&blocked, &set);
|
||||
sigprocmask(SIG_SETMASK, &blocked, NULL);
|
||||
if (restore_user_regs(env, mcp, sig))
|
||||
goto sigsegv;
|
||||
|
||||
unlock_user_struct(mcp, mcp_addr, 1);
|
||||
return 0;
|
||||
|
||||
sigsegv:
|
||||
unlock_user_struct(mcp, mcp_addr, 1);
|
||||
return 1;
|
||||
#endif
|
||||
}
|
||||
|
||||
long do_rt_sigreturn(CPUState *env)
|
||||
{
|
||||
struct target_rt_sigframe *rt_sf = NULL;
|
||||
target_ulong rt_sf_addr;
|
||||
|
||||
rt_sf_addr = env->gpr[1] + SIGNAL_FRAMESIZE + 16;
|
||||
if (!lock_user_struct(VERIFY_READ, rt_sf, rt_sf_addr, 1))
|
||||
goto sigsegv;
|
||||
|
||||
if (do_setcontext(&rt_sf->uc, env, 1))
|
||||
goto sigsegv;
|
||||
|
||||
do_sigaltstack(rt_sf_addr
|
||||
+ offsetof(struct target_rt_sigframe, uc.uc_stack),
|
||||
0, env->gpr[1]);
|
||||
|
||||
unlock_user_struct(rt_sf, rt_sf_addr, 1);
|
||||
return -TARGET_QEMU_ESIGRETURN;
|
||||
|
||||
sigsegv:
|
||||
unlock_user_struct(rt_sf, rt_sf_addr, 1);
|
||||
if (logfile)
|
||||
fprintf (logfile, "segfaulting from do_rt_sigreturn\n");
|
||||
force_sig(SIGSEGV);
|
||||
return 0;
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
static void setup_frame(int sig, struct target_sigaction *ka,
|
||||
|
|
|
|||
Reference in New Issue