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4c681ba3b8
Cavium Octeon userspace is not following a generic MIPS Linux TLS ABI rule here. Older Octeon glibc uses the k0 register as the fast thread pointer, while newer Octeon2 and Octeon3 glibc variants use the normal rdhwr $29 path. linux-user already updates CP0_UserLocal for cpu_set_tls() and TARGET_NR_set_thread_area, but it does not keep gpr[26] synchronized. That leaves EF_MIPS_MACH_OCTEON userlands able to complete set_thread_area() and still reach pthread startup or pthread_self() with a stale k0 value. Use the existing MIPS ELF machine flags from linux-user/elfload.c and mirror CP0_UserLocal into gpr[26] only for EF_MIPS_MACH_OCTEON. Signed-off-by: James Hilliard <james.hilliard1@gmail.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Helge Deller <deller@gmx.de>
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/*
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* MIPS specific CPU ABI and functions for linux-user
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*
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* Copyright (c) 2004-2005 Jocelyn Mayer
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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 2.1 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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#ifndef MIPS_TARGET_CPU_H
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#define MIPS_TARGET_CPU_H
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static inline void cpu_clone_regs_child(CPUMIPSState *env, target_ulong newsp,
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unsigned flags)
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{
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if (newsp) {
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env->active_tc.gpr[29] = newsp;
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}
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env->active_tc.gpr[7] = 0;
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env->active_tc.gpr[2] = 0;
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}
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static inline void cpu_clone_regs_parent(CPUMIPSState *env, unsigned flags)
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{
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}
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static inline void cpu_set_tls(CPUMIPSState *env, target_ulong newtls)
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{
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TaskState *ts = get_task_state(env_cpu(env));
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env->active_tc.CP0_UserLocal = newtls;
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if (ts->info->use_k0_tls) {
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env->active_tc.gpr[26] = newtls;
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}
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}
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static inline abi_ulong get_sp_from_cpustate(CPUMIPSState *state)
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{
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return state->active_tc.gpr[29];
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}
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#endif
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