3ac34cc985
Update ucontext to implement sigreturn. Signed-off-by: Stacey Son <sson@FreeBSD.org> Signed-off-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
197 lines
6.6 KiB
C
197 lines
6.6 KiB
C
/*
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* arm signal functions
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*
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* Copyright (c) 2013 Stacey D. Son
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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.h"
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/*
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* Compare to arm/arm/machdep.c sendsig()
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* Assumes that target stack frame memory is locked.
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*/
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abi_long set_sigtramp_args(CPUARMState *env, int sig,
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struct target_sigframe *frame,
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abi_ulong frame_addr,
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struct target_sigaction *ka)
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{
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/*
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* Arguments to signal handler:
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* r0 = signal number
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* r1 = siginfo pointer
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* r2 = ucontext pointer
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* r5 = ucontext pointer
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* pc = signal handler pointer
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* sp = sigframe struct pointer
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* lr = sigtramp at base of user stack
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*/
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env->regs[0] = sig;
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env->regs[1] = frame_addr +
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offsetof(struct target_sigframe, sf_si);
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env->regs[2] = frame_addr +
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offsetof(struct target_sigframe, sf_uc);
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/* the trampoline uses r5 as the uc address */
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env->regs[5] = frame_addr +
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offsetof(struct target_sigframe, sf_uc);
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env->regs[TARGET_REG_PC] = ka->_sa_handler & ~1;
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env->regs[TARGET_REG_SP] = frame_addr;
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env->regs[TARGET_REG_LR] = TARGET_PS_STRINGS - TARGET_SZSIGCODE;
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/*
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* Low bit indicates whether or not we're entering thumb mode.
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*/
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cpsr_write(env, (ka->_sa_handler & 1) * CPSR_T, CPSR_T, CPSRWriteByInstr);
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return 0;
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}
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/*
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* Compare to arm/arm/machdep.c get_mcontext()
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* Assumes that the memory is locked if mcp points to user memory.
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*/
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abi_long get_mcontext(CPUARMState *env, target_mcontext_t *mcp, int flags)
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{
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int err = 0;
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uint32_t *gr = mcp->__gregs;
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if (mcp->mc_vfp_size != 0 && mcp->mc_vfp_size != sizeof(target_mcontext_vfp_t)) {
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return -TARGET_EINVAL;
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}
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gr[TARGET_REG_CPSR] = tswap32(cpsr_read(env));
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if (flags & TARGET_MC_GET_CLEAR_RET) {
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gr[TARGET_REG_R0] = 0;
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gr[TARGET_REG_CPSR] &= ~CPSR_C;
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} else {
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gr[TARGET_REG_R0] = tswap32(env->regs[0]);
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}
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gr[TARGET_REG_R1] = tswap32(env->regs[1]);
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gr[TARGET_REG_R2] = tswap32(env->regs[2]);
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gr[TARGET_REG_R3] = tswap32(env->regs[3]);
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gr[TARGET_REG_R4] = tswap32(env->regs[4]);
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gr[TARGET_REG_R5] = tswap32(env->regs[5]);
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gr[TARGET_REG_R6] = tswap32(env->regs[6]);
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gr[TARGET_REG_R7] = tswap32(env->regs[7]);
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gr[TARGET_REG_R8] = tswap32(env->regs[8]);
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gr[TARGET_REG_R9] = tswap32(env->regs[9]);
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gr[TARGET_REG_R10] = tswap32(env->regs[10]);
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gr[TARGET_REG_R11] = tswap32(env->regs[11]);
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gr[TARGET_REG_R12] = tswap32(env->regs[12]);
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gr[TARGET_REG_SP] = tswap32(env->regs[13]);
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gr[TARGET_REG_LR] = tswap32(env->regs[14]);
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gr[TARGET_REG_PC] = tswap32(env->regs[15]);
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if (mcp->mc_vfp_size != 0 && mcp->mc_vfp_ptr != 0) {
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/* see get_vfpcontext in sys/arm/arm/exec_machdep.c */
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target_mcontext_vfp_t *vfp;
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vfp = lock_user(VERIFY_WRITE, mcp->mc_vfp_ptr, sizeof(*vfp), 0);
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for (int i = 0; i < 32; i++) {
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vfp->mcv_reg[i] = tswap64(*aa32_vfp_dreg(env, i));
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}
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vfp->mcv_fpscr = tswap32(vfp_get_fpscr(env));
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unlock_user(vfp, mcp->mc_vfp_ptr, sizeof(*vfp));
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}
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return err;
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}
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/* Compare to arm/arm/exec_machdep.c set_mcontext() */
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abi_long set_mcontext(CPUARMState *env, target_mcontext_t *mcp, int srflag)
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{
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int err = 0;
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const uint32_t *gr = mcp->__gregs;
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uint32_t cpsr, ccpsr = cpsr_read(env);
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uint32_t fpscr, mask;
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cpsr = tswap32(gr[TARGET_REG_CPSR]);
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/*
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* Only allow certain bits to change, reject attempted changes to non-user
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* bits. In addition, make sure we're headed for user mode and none of the
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* interrupt bits are set.
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*/
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if ((ccpsr & ~CPSR_USER) != (cpsr & ~CPSR_USER)) {
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return -TARGET_EINVAL;
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}
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if ((cpsr & CPSR_M) != ARM_CPU_MODE_USR ||
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(cpsr & (CPSR_I | CPSR_F)) != 0) {
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return -TARGET_EINVAL;
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}
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/*
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* The movs pc,lr instruction that implements the return to userland masks
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* these bits out.
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*/
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mask = cpsr & CPSR_T ? 0x1 : 0x3;
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/*
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* Make sure that we either have no vfp, or it's the correct size.
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* FreeBSD just ignores it, though, so maybe we'll need to adjust
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* things below instead.
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*/
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if (mcp->mc_vfp_size != 0 && mcp->mc_vfp_size != sizeof(target_mcontext_vfp_t)) {
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return -TARGET_EINVAL;
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}
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env->regs[0] = tswap32(gr[TARGET_REG_R0]);
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env->regs[1] = tswap32(gr[TARGET_REG_R1]);
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env->regs[2] = tswap32(gr[TARGET_REG_R2]);
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env->regs[3] = tswap32(gr[TARGET_REG_R3]);
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env->regs[4] = tswap32(gr[TARGET_REG_R4]);
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env->regs[5] = tswap32(gr[TARGET_REG_R5]);
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env->regs[6] = tswap32(gr[TARGET_REG_R6]);
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env->regs[7] = tswap32(gr[TARGET_REG_R7]);
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env->regs[8] = tswap32(gr[TARGET_REG_R8]);
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env->regs[9] = tswap32(gr[TARGET_REG_R9]);
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env->regs[10] = tswap32(gr[TARGET_REG_R10]);
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env->regs[11] = tswap32(gr[TARGET_REG_R11]);
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env->regs[12] = tswap32(gr[TARGET_REG_R12]);
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env->regs[13] = tswap32(gr[TARGET_REG_SP]);
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env->regs[14] = tswap32(gr[TARGET_REG_LR]);
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env->regs[15] = tswap32(gr[TARGET_REG_PC] & ~mask);
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if (mcp->mc_vfp_size != 0 && mcp->mc_vfp_ptr != 0) {
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/* see set_vfpcontext in sys/arm/arm/exec_machdep.c */
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target_mcontext_vfp_t *vfp;
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vfp = lock_user(VERIFY_READ, mcp->mc_vfp_ptr, sizeof(*vfp), 1);
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for (int i = 0; i < 32; i++) {
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__get_user(*aa32_vfp_dreg(env, i), &vfp->mcv_reg[i]);
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}
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__get_user(fpscr, &vfp->mcv_fpscr);
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vfp_set_fpscr(env, fpscr);
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unlock_user(vfp, mcp->mc_vfp_ptr, sizeof(target_ucontext_t));
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/*
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* linux-user sets fpexc, fpinst and fpinst2, but these aren't in
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* FreeBSD's mcontext, what to do?
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*/
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}
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cpsr_write(env, cpsr, CPSR_USER | CPSR_EXEC, CPSRWriteByInstr);
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return err;
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}
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/* Compare to arm/arm/machdep.c sys_sigreturn() */
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abi_long get_ucontext_sigreturn(CPUARMState *env, abi_ulong target_sf,
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abi_ulong *target_uc)
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{
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*target_uc = target_sf;
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return 0;
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}
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