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8640de0dee
Cause syscall handlers to be typed as follows when called indirectly
throughout the kernel. This is to allow for better type checking.
typedef long (*syscall_fn)(unsigned long, unsigned long, unsigned long,
unsigned long, unsigned long, unsigned long);
Since both 32 and 64-bit abis allow for at least the first six
machine-word length parameters to a function to be passed by registers,
even handlers which admit fewer than six parameters may be viewed as
having the above type.
Coercing syscalls to syscall_fn requires a cast to void* to avoid
-Wcast-function-type.
Fixup comparisons in VDSO to avoid pointer-integer comparison. Introduce
explicit cast on systems with SPUs.
Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220921065605.1051927-19-rmclure@linux.ibm.com
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* System call callback functions for SPUs
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*/
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#undef DEBUG
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#include <linux/kallsyms.h>
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#include <linux/export.h>
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#include <linux/syscalls.h>
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#include <asm/spu.h>
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#include <asm/syscalls.h>
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#include <asm/unistd.h>
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/*
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* This table defines the system calls that an SPU can call.
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* It is currently a subset of the 64 bit powerpc system calls,
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* with the exact semantics.
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*
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* The reasons for disabling some of the system calls are:
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* 1. They interact with the way SPU syscalls are handled
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* and we can't let them execute ever:
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* restart_syscall, exit, for, execve, ptrace, ...
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* 2. They are deprecated and replaced by other means:
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* uselib, pciconfig_*, sysfs, ...
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* 3. They are somewhat interacting with the system in a way
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* we don't want an SPU to:
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* reboot, init_module, mount, kexec_load
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* 4. They are optional and we can't rely on them being
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* linked into the kernel. Unfortunately, the cond_syscall
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* helper does not work here as it does not add the necessary
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* opd symbols:
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* mbind, mq_open, ipc, ...
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*/
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static const syscall_fn spu_syscall_table[] = {
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#define __SYSCALL_WITH_COMPAT(nr, entry, compat) __SYSCALL(nr, entry)
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#define __SYSCALL(nr, entry) [nr] = (void *) entry,
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#include <asm/syscall_table_spu.h>
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};
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long spu_sys_callback(struct spu_syscall_block *s)
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{
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syscall_fn syscall;
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if (s->nr_ret >= ARRAY_SIZE(spu_syscall_table)) {
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pr_debug("%s: invalid syscall #%lld", __func__, s->nr_ret);
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return -ENOSYS;
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}
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syscall = spu_syscall_table[s->nr_ret];
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pr_debug("SPU-syscall "
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"%pSR:syscall%lld(%llx, %llx, %llx, %llx, %llx, %llx)\n",
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syscall,
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s->nr_ret,
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s->parm[0], s->parm[1], s->parm[2],
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s->parm[3], s->parm[4], s->parm[5]);
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return syscall(s->parm[0], s->parm[1], s->parm[2],
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s->parm[3], s->parm[4], s->parm[5]);
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}
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EXPORT_SYMBOL_GPL(spu_sys_callback);
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