mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-03 17:40:04 +00:00
arch/tile: eliminate pt_regs trampolines for syscalls
Using the new current_pt_regs() model, we can remove some trampolines from assembly code and call directly to the C syscall implementations. rt_sigreturn() and clone() still need some assembly wrapping, but no longer are passed a pt_regs pointer. sigaltstack() and the tilepro-specific cmpxchg_badaddr() syscalls are now just straight C. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
parent
530550651f
commit
6b14e4198c
10 changed files with 39 additions and 57 deletions
|
@ -280,10 +280,9 @@ long compat_sys_rt_sigaction(int sig, struct compat_sigaction __user *act,
|
|||
size_t sigsetsize);
|
||||
long compat_sys_rt_sigqueueinfo(int pid, int sig,
|
||||
struct compat_siginfo __user *uinfo);
|
||||
long compat_sys_rt_sigreturn(struct pt_regs *);
|
||||
long compat_sys_rt_sigreturn(void);
|
||||
long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
|
||||
struct compat_sigaltstack __user *uoss_ptr,
|
||||
struct pt_regs *);
|
||||
struct compat_sigaltstack __user *uoss_ptr);
|
||||
long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high);
|
||||
long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high);
|
||||
long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count,
|
||||
|
@ -300,9 +299,7 @@ long compat_sys_fallocate(int fd, int mode,
|
|||
long compat_sys_sched_rr_get_interval(compat_pid_t pid,
|
||||
struct compat_timespec __user *interval);
|
||||
|
||||
/* These are the intvec_64.S trampolines. */
|
||||
long _compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
|
||||
struct compat_sigaltstack __user *uoss_ptr);
|
||||
/* Assembly trampoline to avoid clobbering r0. */
|
||||
long _compat_sys_rt_sigreturn(void);
|
||||
|
||||
#endif /* _ASM_TILE_COMPAT_H */
|
||||
|
|
|
@ -51,8 +51,7 @@ long sys_cacheflush(unsigned long addr, unsigned long len,
|
|||
|
||||
#ifndef __tilegx__
|
||||
/* mm/fault.c */
|
||||
long sys_cmpxchg_badaddr(unsigned long address, struct pt_regs *);
|
||||
long _sys_cmpxchg_badaddr(unsigned long address);
|
||||
long sys_cmpxchg_badaddr(unsigned long address);
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_COMPAT
|
||||
|
@ -63,15 +62,23 @@ long sys_truncate64(const char __user *path, loff_t length);
|
|||
long sys_ftruncate64(unsigned int fd, loff_t length);
|
||||
#endif
|
||||
|
||||
/* These are the intvec*.S trampolines. */
|
||||
long _sys_sigaltstack(const stack_t __user *, stack_t __user *);
|
||||
long _sys_rt_sigreturn(void);
|
||||
long _sys_clone(unsigned long clone_flags, unsigned long newsp,
|
||||
/* Provide versions of standard syscalls that use current_pt_regs(). */
|
||||
long sys_clone(unsigned long clone_flags, unsigned long newsp,
|
||||
void __user *parent_tid, void __user *child_tid);
|
||||
long sys_execve(const char __user *filename,
|
||||
const char __user *const __user *argv,
|
||||
const char __user *const __user *envp);
|
||||
long sys_rt_sigreturn(void);
|
||||
long sys_sigaltstack(const stack_t __user *, stack_t __user *);
|
||||
#define sys_clone sys_clone
|
||||
#define sys_execve sys_execve
|
||||
#define sys_rt_sigreturn sys_rt_sigreturn
|
||||
#define sys_sigaltstack sys_sigaltstack
|
||||
|
||||
/* These are the intvec*.S trampolines. */
|
||||
long _sys_rt_sigreturn(void);
|
||||
long _sys_clone(unsigned long clone_flags, unsigned long newsp,
|
||||
void __user *parent_tid, void __user *child_tid);
|
||||
|
||||
#include <asm-generic/syscalls.h>
|
||||
|
||||
|
|
|
@ -102,9 +102,9 @@ long compat_sys_sched_rr_get_interval(compat_pid_t pid,
|
|||
#define compat_sys_fadvise64_64 sys32_fadvise64_64
|
||||
#define compat_sys_readahead sys32_readahead
|
||||
|
||||
/* Call the trampolines to manage pt_regs where necessary. */
|
||||
#define compat_sys_sigaltstack _compat_sys_sigaltstack
|
||||
/* Call the assembly trampolines where necessary. */
|
||||
#define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
|
||||
#undef sys_clone
|
||||
#define sys_clone _sys_clone
|
||||
|
||||
/*
|
||||
|
|
|
@ -197,8 +197,7 @@ int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
|
|||
}
|
||||
|
||||
long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
|
||||
struct compat_sigaltstack __user *uoss_ptr,
|
||||
struct pt_regs *regs)
|
||||
struct compat_sigaltstack __user *uoss_ptr)
|
||||
{
|
||||
stack_t uss, uoss;
|
||||
int ret;
|
||||
|
@ -219,7 +218,7 @@ long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
|
|||
set_fs(KERNEL_DS);
|
||||
ret = do_sigaltstack(uss_ptr ? (stack_t __user __force *)&uss : NULL,
|
||||
(stack_t __user __force *)&uoss,
|
||||
(unsigned long)compat_ptr(regs->sp));
|
||||
(unsigned long)compat_ptr(current_pt_regs()->sp));
|
||||
set_fs(seg);
|
||||
if (ret >= 0 && uoss_ptr) {
|
||||
if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(*uoss_ptr)) ||
|
||||
|
@ -232,8 +231,9 @@ long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
|
|||
}
|
||||
|
||||
/* The assembly shim for this function arranges to ignore the return value. */
|
||||
long compat_sys_rt_sigreturn(struct pt_regs *regs)
|
||||
long compat_sys_rt_sigreturn(void)
|
||||
{
|
||||
struct pt_regs *regs = current_pt_regs();
|
||||
struct compat_rt_sigframe __user *frame =
|
||||
(struct compat_rt_sigframe __user *) compat_ptr(regs->sp);
|
||||
sigset_t set;
|
||||
|
@ -248,7 +248,7 @@ long compat_sys_rt_sigreturn(struct pt_regs *regs)
|
|||
if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
|
||||
goto badframe;
|
||||
|
||||
if (compat_sys_sigaltstack(&frame->uc.uc_stack, NULL, regs) != 0)
|
||||
if (compat_sys_sigaltstack(&frame->uc.uc_stack, NULL) != 0)
|
||||
goto badframe;
|
||||
|
||||
return 0;
|
||||
|
|
|
@ -1452,15 +1452,6 @@ STD_ENTRY_LOCAL(bad_intr)
|
|||
panic "Unhandled interrupt %#x: PC %#lx"
|
||||
STD_ENDPROC(bad_intr)
|
||||
|
||||
/* Put address of pt_regs in reg and jump. */
|
||||
#define PTREGS_SYSCALL(x, reg) \
|
||||
STD_ENTRY(_##x); \
|
||||
{ \
|
||||
PTREGS_PTR(reg, PTREGS_OFFSET_BASE); \
|
||||
j x \
|
||||
}; \
|
||||
STD_ENDPROC(_##x)
|
||||
|
||||
/*
|
||||
* Special-case sigreturn to not write r0 to the stack on return.
|
||||
* This is technically more efficient, but it also avoids difficulties
|
||||
|
@ -1476,11 +1467,9 @@ STD_ENTRY_LOCAL(bad_intr)
|
|||
}; \
|
||||
STD_ENDPROC(_##x)
|
||||
|
||||
PTREGS_SYSCALL(sys_sigaltstack, r2)
|
||||
PTREGS_SYSCALL_SIGRETURN(sys_rt_sigreturn, r0)
|
||||
PTREGS_SYSCALL(sys_cmpxchg_badaddr, r1)
|
||||
|
||||
/* Save additional callee-saves to pt_regs, put address in r4 and jump. */
|
||||
/* Save additional callee-saves to pt_regs and jump to standard function. */
|
||||
STD_ENTRY(_sys_clone)
|
||||
push_extra_callee_saves r4
|
||||
j sys_clone
|
||||
|
|
|
@ -1181,15 +1181,6 @@ STD_ENTRY_LOCAL(bad_intr)
|
|||
panic "Unhandled interrupt %#x: PC %#lx"
|
||||
STD_ENDPROC(bad_intr)
|
||||
|
||||
/* Put address of pt_regs in reg and jump. */
|
||||
#define PTREGS_SYSCALL(x, reg) \
|
||||
STD_ENTRY(_##x); \
|
||||
{ \
|
||||
PTREGS_PTR(reg, PTREGS_OFFSET_BASE); \
|
||||
j x \
|
||||
}; \
|
||||
STD_ENDPROC(_##x)
|
||||
|
||||
/*
|
||||
* Special-case sigreturn to not write r0 to the stack on return.
|
||||
* This is technically more efficient, but it also avoids difficulties
|
||||
|
@ -1205,14 +1196,12 @@ STD_ENTRY_LOCAL(bad_intr)
|
|||
}; \
|
||||
STD_ENDPROC(_##x)
|
||||
|
||||
PTREGS_SYSCALL(sys_sigaltstack, r2)
|
||||
PTREGS_SYSCALL_SIGRETURN(sys_rt_sigreturn, r0)
|
||||
#ifdef CONFIG_COMPAT
|
||||
PTREGS_SYSCALL(compat_sys_sigaltstack, r2)
|
||||
PTREGS_SYSCALL_SIGRETURN(compat_sys_rt_sigreturn, r0)
|
||||
#endif
|
||||
|
||||
/* Save additional callee-saves to pt_regs, put address in r4 and jump. */
|
||||
/* Save additional callee-saves to pt_regs and jump to standard function. */
|
||||
STD_ENTRY(_sys_clone)
|
||||
push_extra_callee_saves r4
|
||||
j sys_clone
|
||||
|
|
|
@ -584,10 +584,10 @@ int do_work_pending(struct pt_regs *regs, u32 thread_info_flags)
|
|||
}
|
||||
|
||||
/* Note there is an implicit fifth argument if (clone_flags & CLONE_SETTLS). */
|
||||
SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
|
||||
void __user *, parent_tidptr, void __user *, child_tidptr,
|
||||
struct pt_regs *, regs)
|
||||
SYSCALL_DEFINE4(clone, unsigned long, clone_flags, unsigned long, newsp,
|
||||
void __user *, parent_tidptr, void __user *, child_tidptr)
|
||||
{
|
||||
struct pt_regs *regs = current_pt_regs();
|
||||
if (!newsp)
|
||||
newsp = regs->sp;
|
||||
return do_fork(clone_flags, newsp, regs, 0,
|
||||
|
|
|
@ -37,10 +37,10 @@
|
|||
|
||||
#define DEBUG_SIG 0
|
||||
|
||||
SYSCALL_DEFINE3(sigaltstack, const stack_t __user *, uss,
|
||||
stack_t __user *, uoss, struct pt_regs *, regs)
|
||||
SYSCALL_DEFINE2(sigaltstack, const stack_t __user *, uss,
|
||||
stack_t __user *, uoss)
|
||||
{
|
||||
return do_sigaltstack(uss, uoss, regs->sp);
|
||||
return do_sigaltstack(uss, uoss, current_pt_regs()->sp);
|
||||
}
|
||||
|
||||
|
||||
|
@ -83,8 +83,9 @@ void signal_fault(const char *type, struct pt_regs *regs,
|
|||
}
|
||||
|
||||
/* The assembly shim for this function arranges to ignore the return value. */
|
||||
SYSCALL_DEFINE1(rt_sigreturn, struct pt_regs *, regs)
|
||||
SYSCALL_DEFINE0(rt_sigreturn)
|
||||
{
|
||||
struct pt_regs *regs = current_pt_regs();
|
||||
struct rt_sigframe __user *frame =
|
||||
(struct rt_sigframe __user *)(regs->sp);
|
||||
sigset_t set;
|
||||
|
|
|
@ -106,13 +106,11 @@ SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
|
|||
#define sys_readahead sys32_readahead
|
||||
#endif
|
||||
|
||||
/* Call the trampolines to manage pt_regs where necessary. */
|
||||
#define sys_sigaltstack _sys_sigaltstack
|
||||
/* Call the assembly trampolines where necessary. */
|
||||
#undef sys_rt_sigreturn
|
||||
#define sys_rt_sigreturn _sys_rt_sigreturn
|
||||
#undef sys_clone
|
||||
#define sys_clone _sys_clone
|
||||
#ifndef __tilegx__
|
||||
#define sys_cmpxchg_badaddr _sys_cmpxchg_badaddr
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Note that we can't include <linux/unistd.h> here since the header
|
||||
|
|
|
@ -70,9 +70,10 @@ static noinline void force_sig_info_fault(const char *type, int si_signo,
|
|||
* Synthesize the fault a PL0 process would get by doing a word-load of
|
||||
* an unaligned address or a high kernel address.
|
||||
*/
|
||||
SYSCALL_DEFINE2(cmpxchg_badaddr, unsigned long, address,
|
||||
struct pt_regs *, regs)
|
||||
SYSCALL_DEFINE1(cmpxchg_badaddr, unsigned long, address)
|
||||
{
|
||||
struct pt_regs *regs = current_pt_regs();
|
||||
|
||||
if (address >= PAGE_OFFSET)
|
||||
force_sig_info_fault("atomic segfault", SIGSEGV, SEGV_MAPERR,
|
||||
address, INT_DTLB_MISS, current, regs);
|
||||
|
|
Loading…
Reference in a new issue