ce6c541dcb
Added get_ucontext_sigreturn function to check processor state ensuring current execution mode is EL0 and no flags indicating interrupts or exceptions are set. Updated AArch64 code to use CF directly without reading/writing the entire processor state, improving efficiency. Changed FP data structures to use Int128 instead of __uint128_t, leveraging QEMU's generic mechanism for referencing this type. Signed-off-by: Stacey Son <sson@FreeBSD.org> Signed-off-by: Ajeet Singh <itachis@FreeBSD.org> Signed-off-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20240707191128.10509-9-itachis@FreeBSD.org> Signed-off-by: Warner Losh <imp@bsdimp.com>
138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/*
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* ARM AArch64 specific signal definitions for bsd-user
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*
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* Copyright (c) 2015 Stacey D. Son <sson at FreeBSD>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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/*
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* Compare to sendsig() in sys/arm64/arm64/exec_machdep.c
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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 *regs, 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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* x0 = signal number
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* x1 = siginfo pointer
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* x2 = ucontext pointer
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* pc/elr = 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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regs->xregs[0] = sig;
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regs->xregs[1] = frame_addr +
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offsetof(struct target_sigframe, sf_si);
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regs->xregs[2] = frame_addr +
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offsetof(struct target_sigframe, sf_uc);
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regs->pc = ka->_sa_handler;
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regs->xregs[TARGET_REG_SP] = frame_addr;
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regs->xregs[TARGET_REG_LR] = TARGET_PS_STRINGS - TARGET_SZSIGCODE;
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return 0;
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}
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/*
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* Compare to get_mcontext() in arm64/arm64/machdep.c
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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 *regs, target_mcontext_t *mcp, int flags)
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{
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int err = 0, i;
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uint64_t *gr = mcp->mc_gpregs.gp_x;
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mcp->mc_gpregs.gp_spsr = pstate_read(regs);
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if (flags & TARGET_MC_GET_CLEAR_RET) {
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gr[0] = 0UL;
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mcp->mc_gpregs.gp_spsr &= ~CPSR_C;
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} else {
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gr[0] = tswap64(regs->xregs[0]);
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}
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for (i = 1; i < 30; i++) {
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gr[i] = tswap64(regs->xregs[i]);
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}
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mcp->mc_gpregs.gp_sp = tswap64(regs->xregs[TARGET_REG_SP]);
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mcp->mc_gpregs.gp_lr = tswap64(regs->xregs[TARGET_REG_LR]);
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mcp->mc_gpregs.gp_elr = tswap64(regs->pc);
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/* XXX FP? */
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return err;
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}
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/*
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* Compare to arm64/arm64/exec_machdep.c sendsig()
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* Assumes that the memory is locked if frame points to user memory.
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*/
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abi_long setup_sigframe_arch(CPUARMState *env, abi_ulong frame_addr,
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struct target_sigframe *frame, int flags)
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{
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target_mcontext_t *mcp = &frame->sf_uc.uc_mcontext;
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get_mcontext(env, mcp, flags);
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return 0;
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}
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/*
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* Compare to set_mcontext() in arm64/arm64/machdep.c
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* Assumes that the memory is locked if frame points to user memory.
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*/
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abi_long set_mcontext(CPUARMState *regs, target_mcontext_t *mcp, int srflag)
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{
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int err = 0, i;
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const uint64_t *gr = mcp->mc_gpregs.gp_x;
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for (i = 0; i < 30; i++) {
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regs->xregs[i] = tswap64(gr[i]);
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}
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regs->xregs[TARGET_REG_SP] = tswap64(mcp->mc_gpregs.gp_sp);
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regs->xregs[TARGET_REG_LR] = tswap64(mcp->mc_gpregs.gp_lr);
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regs->pc = mcp->mc_gpregs.gp_elr;
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pstate_write(regs, mcp->mc_gpregs.gp_spsr);
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/* XXX FP? */
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return err;
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}
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/* Compare to sys_sigreturn() in arm64/arm64/machdep.c */
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abi_long get_ucontext_sigreturn(CPUARMState *regs, abi_ulong target_sf,
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abi_ulong *target_uc)
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{
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uint32_t pstate = pstate_read(regs);
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*target_uc = 0;
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if ((pstate & PSTATE_M) != PSTATE_MODE_EL0t ||
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(pstate & (PSTATE_F | PSTATE_I | PSTATE_A | PSTATE_D)) != 0) {
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return -TARGET_EINVAL;
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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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