arch/powerpc/kernel/syscall.c

Source file repositories/reference/linux-study-clean/arch/powerpc/kernel/syscall.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/kernel/syscall.c
Extension
.c
Size
1600 bytes
Lines
65
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: syscall or user/kernel boundary
Status
core implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

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;
}

Annotation

Implementation Notes