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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/compat.h>#include <linux/context_tracking.h>#include <linux/randomize_kstack.h>#include <linux/entry-common.h>
#include <asm/interrupt.h>#include <asm/kup.h>#include <asm/syscall.h>#include <asm/time.h>#include <asm/tm.h>#include <asm/unistd.h>
/* Has to run notrace because it is entered not completely "reconciled" */notrace long system_call_exception(struct pt_regs *regs, unsigned long r0){ long ret; syscall_fn f;
add_random_kstack_offset(); r0 = syscall_enter_from_user_mode(regs, r0);
if (unlikely(r0 >= NR_syscalls)) { if (unlikely(trap_is_unsupported_scv(regs))) { /* Unsupported scv vector */ _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); return regs->gpr[3]; } return -ENOSYS; }
/* May be faster to do array_index_nospec? */ barrier_nospec();
#ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER // No COMPAT if we have SYSCALL_WRAPPER, see Kconfig f = (void *)sys_call_table[r0]; ret = f(regs);#else if (unlikely(is_compat_task())) { unsigned long r3, r4, r5, r6, r7, r8;
f = (void *)compat_sys_call_table[r0];
r3 = regs->gpr[3] & 0x00000000ffffffffULL; r4 = regs->gpr[4] & 0x00000000ffffffffULL; r5 = regs->gpr[5] & 0x00000000ffffffffULL; r6 = regs->gpr[6] & 0x00000000ffffffffULL; r7 = regs->gpr[7] & 0x00000000ffffffffULL; r8 = regs->gpr[8] & 0x00000000ffffffffULL;
ret = f(r3, r4, r5, r6, r7, r8); } else { f = (void *)sys_call_table[r0];
ret = f(regs->gpr[3], regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7], regs->gpr[8]); }#endif
return ret;}