55b89540b0
The arm64 port contains wrappers for arm32 syscalls that pass 64-bit values. These wrappers concatenate the two registers to hold a 64-bit value in a single X register. On BE, however, the lower and higher words are swapped. Create a new assembler macro, regs_to_64, that when on BE systems swaps the registers in the orr instruction. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Matthew Leach <matthew.leach@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
115 lines
2.8 KiB
ArmAsm
115 lines
2.8 KiB
ArmAsm
/*
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* Compat system call wrappers
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*
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* Copyright (C) 2012 ARM Ltd.
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* Authors: Will Deacon <will.deacon@arm.com>
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* Catalin Marinas <catalin.marinas@arm.com>
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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 version 2 as
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* published by the Free Software Foundation.
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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 <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/asm-offsets.h>
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/*
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* System call wrappers for the AArch32 compatibility layer.
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*/
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compat_sys_sigreturn_wrapper:
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mov x0, sp
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mov x27, #0 // prevent syscall restart handling (why)
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b compat_sys_sigreturn
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ENDPROC(compat_sys_sigreturn_wrapper)
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compat_sys_rt_sigreturn_wrapper:
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mov x0, sp
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mov x27, #0 // prevent syscall restart handling (why)
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b compat_sys_rt_sigreturn
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ENDPROC(compat_sys_rt_sigreturn_wrapper)
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compat_sys_statfs64_wrapper:
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mov w3, #84
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cmp w1, #88
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csel w1, w3, w1, eq
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b compat_sys_statfs64
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ENDPROC(compat_sys_statfs64_wrapper)
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compat_sys_fstatfs64_wrapper:
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mov w3, #84
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cmp w1, #88
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csel w1, w3, w1, eq
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b compat_sys_fstatfs64
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ENDPROC(compat_sys_fstatfs64_wrapper)
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/*
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* Wrappers for AArch32 syscalls that either take 64-bit parameters
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* in registers or that take 32-bit parameters which require sign
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* extension.
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*/
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compat_sys_pread64_wrapper:
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regs_to_64 x3, x4, x5
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b sys_pread64
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ENDPROC(compat_sys_pread64_wrapper)
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compat_sys_pwrite64_wrapper:
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regs_to_64 x3, x4, x5
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b sys_pwrite64
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ENDPROC(compat_sys_pwrite64_wrapper)
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compat_sys_truncate64_wrapper:
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regs_to_64 x1, x2, x3
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b sys_truncate
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ENDPROC(compat_sys_truncate64_wrapper)
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compat_sys_ftruncate64_wrapper:
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regs_to_64 x1, x2, x3
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b sys_ftruncate
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ENDPROC(compat_sys_ftruncate64_wrapper)
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compat_sys_readahead_wrapper:
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regs_to_64 x1, x2, x3
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mov w2, w4
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b sys_readahead
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ENDPROC(compat_sys_readahead_wrapper)
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compat_sys_fadvise64_64_wrapper:
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mov w6, w1
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regs_to_64 x1, x2, x3
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regs_to_64 x2, x4, x5
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mov w3, w6
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b sys_fadvise64_64
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ENDPROC(compat_sys_fadvise64_64_wrapper)
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compat_sys_sync_file_range2_wrapper:
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regs_to_64 x2, x2, x3
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regs_to_64 x3, x4, x5
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b sys_sync_file_range2
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ENDPROC(compat_sys_sync_file_range2_wrapper)
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compat_sys_fallocate_wrapper:
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regs_to_64 x2, x2, x3
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regs_to_64 x3, x4, x5
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b sys_fallocate
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ENDPROC(compat_sys_fallocate_wrapper)
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#undef __SYSCALL
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#define __SYSCALL(x, y) .quad y // x
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/*
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* The system calls table must be 4KB aligned.
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*/
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.align 12
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ENTRY(compat_sys_call_table)
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#include <asm/unistd32.h>
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