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52 lines
1.9 KiB
C
52 lines
1.9 KiB
C
/*
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* ARM AArch64 specific CPU 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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#ifndef BSD_USER_AARCH64_TARGET_SYSCALL_H
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#define BSD_USER_AARCH64_TARGET_SYSCALL_H
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/*
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* The aarch64 registers are named:
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*
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* x0 through x30 - for 64-bit-wide access (same registers)
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* Register '31' is one of two registers depending on the instruction context:
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* For instructions dealing with the stack, it is the stack pointer, named rsp
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* For all other instructions, it is a "zero" register, which returns 0 when
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* read and discards data when written - named rzr (xzr, wzr)
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*
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* Usage during syscall/function call:
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* r0-r7 are used for arguments and return values
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* For syscalls, the syscall number is in r8
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* r9-r15 are for temporary values (may get trampled)
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* r16-r18 are used for intra-procedure-call and platform values (avoid)
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* The called routine is expected to preserve r19-r28
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* r29 and r30 are used as the frame register and link register (avoid)
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* See the ARM Procedure Call Reference for details.
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*/
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struct target_pt_regs {
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uint64_t regs[31];
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uint64_t sp;
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uint64_t pc;
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uint64_t pstate;
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};
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#define TARGET_HW_MACHINE "arm64"
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#define TARGET_HW_MACHINE_ARCH "aarch64"
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#endif /* BSD_USER_AARCH64_TARGET_SYSCALL_H */
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