1f31243a8c
bsd-user qemu-x86_64 almost immediately dies with:
qemu: 0x4002201a68: unhandled CPU exception 0xd - aborting
on FreeBSD 14.1-RELEASE. This is an instruction that requires
alignment:
(gdb) x/i 0x4002201a68
0x4002201a68: movaps %xmm0,-0x40(%rbp)
and the argument is not aligned:
(gdb) p/x env->regs[5]
$1 = 0x822443b58
A quick experiment shows that the userspace entry point expects
misaligned rsp:
(gdb) starti
(gdb) p/x $rsp
$1 = 0x7fffffffeaa8
Emulate this behavior in bsd-user.
[[ applied Richard's suggestion ]]
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Signed-off-by: Warner Losh <imp@bsdimp.com>
40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
/*
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* x86_64 thread support
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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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#ifndef TARGET_ARCH_THREAD_H
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#define TARGET_ARCH_THREAD_H
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/* Compare to vm_machdep.c cpu_set_upcall_kse() */
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static inline void target_thread_set_upcall(CPUX86State *regs, abi_ulong entry,
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abi_ulong arg, abi_ulong stack_base, abi_ulong stack_size)
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{
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/* XXX */
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}
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static inline void target_thread_init(struct target_pt_regs *regs,
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struct image_info *infop)
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{
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regs->rax = 0;
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regs->rsp = ((infop->start_stack - 8) & ~0xfUL) + 8;
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regs->rip = infop->entry;
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regs->rdi = infop->start_stack;
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}
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#endif /* TARGET_ARCH_THREAD_H */
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