Release 4.10 arch/powerpc/platforms/cell/spu_callbacks.c

/*
 * System call callback functions for SPUs
 */


#undef DEBUG

#include <linux/kallsyms.h>
#include <linux/export.h>
#include <linux/syscalls.h>

#include <asm/spu.h>
#include <asm/syscalls.h>
#include <asm/unistd.h>

/*
 * This table defines the system calls that an SPU can call.
 * It is currently a subset of the 64 bit powerpc system calls,
 * with the exact semantics.
 *
 * The reasons for disabling some of the system calls are:
 * 1. They interact with the way SPU syscalls are handled
 *    and we can't let them execute ever:
 *      restart_syscall, exit, for, execve, ptrace, ...
 * 2. They are deprecated and replaced by other means:
 *      uselib, pciconfig_*, sysfs, ...
 * 3. They are somewhat interacting with the system in a way
 *    we don't want an SPU to:
 *      reboot, init_module, mount, kexec_load
 * 4. They are optional and we can't rely on them being
 *    linked into the kernel. Unfortunately, the cond_syscall
 *    helper does not work here as it does not add the necessary
 *    opd symbols:
 *      mbind, mq_open, ipc, ...
 */


static void *spu_syscall_table[] = {

#define SYSCALL(func)		sys_ni_syscall,

#define COMPAT_SYS(func)	sys_ni_syscall,

#define PPC_SYS(func)		sys_ni_syscall,

#define OLDSYS(func)		sys_ni_syscall,

#define SYS32ONLY(func)		sys_ni_syscall,

#define PPC64ONLY(func)		sys_ni_syscall,

#define SYSX(f, f3264, f32)	sys_ni_syscall,


#define SYSCALL_SPU(func)	sys_##func,

#define COMPAT_SYS_SPU(func)	sys_##func,

#define PPC_SYS_SPU(func)	ppc_##func,

#define SYSX_SPU(f, f3264, f32)	f,

#include <asm/systbl.h>
};



long spu_sys_callback(struct spu_syscall_block *s)
{
	long (*syscall)(u64 a1, u64 a2, u64 a3, u64 a4, u64 a5, u64 a6);

	if (s->nr_ret >= ARRAY_SIZE(spu_syscall_table)) {
		pr_debug("%s: invalid syscall #%lld", __func__, s->nr_ret);
		return -ENOSYS;
	}

	syscall = spu_syscall_table[s->nr_ret];

	pr_debug("SPU-syscall "
		 "%pSR:syscall%lld(%llx, %llx, %llx, %llx, %llx, %llx)\n",
		 syscall,
		 s->nr_ret,
		 s->parm[0], s->parm[1], s->parm[2],
		 s->parm[3], s->parm[4], s->parm[5]);

	return syscall(s->parm[0], s->parm[1], s->parm[2],
		       s->parm[3], s->parm[4], s->parm[5]);
}
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arnd bergmann
158
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david woodhouse
david woodhouse
9
5.23%
1
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joe perches
joe perches
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ingo molnar
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harvey harrison
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EXPORT_SYMBOL_GPL(spu_sys_callback);
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arnd bergmann
arnd bergmann
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andreas schwab
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82
27.61%
1
9.09%
david woodhouse
david woodhouse
9
3.03%
1
9.09%
michael ellerman
michael ellerman
7
2.36%
1
9.09%
joe perches
joe perches
3
1.01%
1
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jeremy kerr
jeremy kerr
2
0.67%
1
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harvey harrison
harvey harrison
1
0.34%
1
9.09%
paul gortmaker
paul gortmaker
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1
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sebastian siewior
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ingo molnar
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Total
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11
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Directory: arch/powerpc/platforms/cell

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