b019dcb05e
For CPU without THREADPTR, we need an alternative way to figure out if we are in user context. This extends the user context check to do that via a brief syscall. Signed-off-by: Daniel Leung <daniel.leung@intel.com>
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/*
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* Copyright (c) 2022 Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/arch/xtensa/syscall.h>
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#ifdef CONFIG_XTENSA_SYSCALL_USE_HELPER
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uintptr_t xtensa_syscall_helper(uintptr_t arg1, uintptr_t arg2,
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uintptr_t arg3, uintptr_t arg4,
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uintptr_t arg5, uintptr_t arg6,
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uintptr_t call_id)
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{
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register uintptr_t a2 __asm__("%a2") = call_id;
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register uintptr_t a6 __asm__("%a6") = arg1;
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register uintptr_t a3 __asm__("%a3") = arg2;
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register uintptr_t a4 __asm__("%a4") = arg3;
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register uintptr_t a5 __asm__("%a5") = arg4;
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register uintptr_t a8 __asm__("%a8") = arg5;
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register uintptr_t a9 __asm__("%a9") = arg6;
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__asm__ volatile("syscall\n\t"
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: "=r" (a2)
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: "r" (a2), "r" (a6), "r" (a3), "r" (a4),
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"r" (a5), "r" (a8), "r" (a9)
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: "memory");
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return a2;
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}
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#endif /* CONFIG_XTENSA_SYSCALL_USE_HELPER */
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#if XCHAL_HAVE_THREADPTR == 0
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#include <xtensa/config/core-isa.h>
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#include <xtensa/config/core.h>
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bool xtensa_is_user_context(void)
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{
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uint32_t ret;
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__asm__ volatile(".global xtensa_is_user_context_epc\n"
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" xtensa_is_user_context_epc:\n"
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" syscall\n"
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" mov %0, a2\n"
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: "=r"(ret) : : "a2");
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return ret != 0;
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}
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#endif /* XCHAL_HAVE_THREADPTR */
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