diff options
| -rw-r--r-- | arch/m68k/include/asm/ptrace.h | 2 | ||||
| -rw-r--r-- | arch/m68k/include/asm/thread_info_mm.h | 1 | ||||
| -rw-r--r-- | arch/m68k/include/asm/unistd.h | 6 | ||||
| -rw-r--r-- | arch/m68k/kernel/entry.S | 4 | ||||
| -rw-r--r-- | arch/m68k/kernel/process.c | 4 | ||||
| -rw-r--r-- | arch/m68k/kernel/ptrace.c | 5 | ||||
| -rw-r--r-- | arch/m68k/kernel/sys_m68k.c | 81 |
7 files changed, 102 insertions, 1 deletions
diff --git a/arch/m68k/include/asm/ptrace.h b/arch/m68k/include/asm/ptrace.h index ee4011c2328..21605c736f6 100644 --- a/arch/m68k/include/asm/ptrace.h +++ b/arch/m68k/include/asm/ptrace.h @@ -71,6 +71,8 @@ struct switch_stack { #define PTRACE_GETFPREGS 14 #define PTRACE_SETFPREGS 15 +#define PTRACE_GET_THREAD_AREA 25 + #define PTRACE_SINGLEBLOCK 33 /* resume execution until next branch */ #ifdef __KERNEL__ diff --git a/arch/m68k/include/asm/thread_info_mm.h b/arch/m68k/include/asm/thread_info_mm.h index 167e518db41..67266c68345 100644 --- a/arch/m68k/include/asm/thread_info_mm.h +++ b/arch/m68k/include/asm/thread_info_mm.h @@ -16,6 +16,7 @@ struct thread_info { struct exec_domain *exec_domain; /* execution domain */ int preempt_count; /* 0 => preemptable, <0 => BUG */ __u32 cpu; /* should always be 0 on m68k */ + unsigned long tp_value; /* thread pointer */ struct restart_block restart_block; }; #endif /* __ASSEMBLY__ */ diff --git a/arch/m68k/include/asm/unistd.h b/arch/m68k/include/asm/unistd.h index 48b87f5ced5..d72a71dabec 100644 --- a/arch/m68k/include/asm/unistd.h +++ b/arch/m68k/include/asm/unistd.h @@ -336,10 +336,14 @@ #define __NR_pwritev 330 #define __NR_rt_tgsigqueueinfo 331 #define __NR_perf_event_open 332 +#define __NR_get_thread_area 333 +#define __NR_set_thread_area 334 +#define __NR_atomic_cmpxchg_32 335 +#define __NR_atomic_barrier 336 #ifdef __KERNEL__ -#define NR_syscalls 333 +#define NR_syscalls 337 #define __ARCH_WANT_IPC_PARSE_VERSION #define __ARCH_WANT_OLD_READDIR diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S index 77fc7c16bf4..e136b8cbe9b 100644 --- a/arch/m68k/kernel/entry.S +++ b/arch/m68k/kernel/entry.S @@ -761,4 +761,8 @@ sys_call_table: .long sys_pwritev /* 330 */ .long sys_rt_tgsigqueueinfo .long sys_perf_event_open + .long sys_get_thread_area + .long sys_set_thread_area + .long sys_atomic_cmpxchg_32 /* 335 */ + .long sys_atomic_barrier diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c index 05296593e71..17c3f325255 100644 --- a/arch/m68k/kernel/process.c +++ b/arch/m68k/kernel/process.c @@ -251,6 +251,10 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, p->thread.usp = usp; p->thread.ksp = (unsigned long)childstack; + + if (clone_flags & CLONE_SETTLS) + task_thread_info(p)->tp_value = regs->d5; + /* * Must save the current SFC/DFC value, NOT the value when * the parent was last descheduled - RGH 10-08-96 diff --git a/arch/m68k/kernel/ptrace.c b/arch/m68k/kernel/ptrace.c index 1fc217e5f06..616e59752c2 100644 --- a/arch/m68k/kernel/ptrace.c +++ b/arch/m68k/kernel/ptrace.c @@ -245,6 +245,11 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) ret = -EFAULT; break; + case PTRACE_GET_THREAD_AREA: + ret = put_user(task_thread_info(child)->tp_value, + (unsigned long __user *)data); + break; + default: ret = ptrace_request(child, request, addr, data); break; diff --git a/arch/m68k/kernel/sys_m68k.c b/arch/m68k/kernel/sys_m68k.c index 218f441de66..e3ad2d67197 100644 --- a/arch/m68k/kernel/sys_m68k.c +++ b/arch/m68k/kernel/sys_m68k.c @@ -28,6 +28,11 @@ #include <asm/traps.h> #include <asm/page.h> #include <asm/unistd.h> +#include <linux/elf.h> +#include <asm/tlb.h> + +asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address, + unsigned long error_code); asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, @@ -595,3 +600,79 @@ int kernel_execve(const char *filename, char *const argv[], char *const envp[]) : "d" (__a), "d" (__b), "d" (__c)); return __res; } + +asmlinkage unsigned long sys_get_thread_area(void) +{ + return current_thread_info()->tp_value; +} + +asmlinkage int sys_set_thread_area(unsigned long tp) +{ + current_thread_info()->tp_value = tp; + return 0; +} + +/* This syscall gets its arguments in A0 (mem), D2 (oldval) and + D1 (newval). */ +asmlinkage int +sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5, + unsigned long __user * mem) +{ + /* This was borrowed from ARM's implementation. */ + for (;;) { + struct mm_struct *mm = current->mm; + pgd_t *pgd; + pmd_t *pmd; + pte_t *pte; + spinlock_t *ptl; + unsigned long mem_value; + + down_read(&mm->mmap_sem); + pgd = pgd_offset(mm, (unsigned long)mem); + if (!pgd_present(*pgd)) + goto bad_access; + pmd = pmd_offset(pgd, (unsigned long)mem); + if (!pmd_present(*pmd)) + goto bad_access; + pte = pte_offset_map_lock(mm, pmd, (unsigned long)mem, &ptl); + if (!pte_present(*pte) || !pte_dirty(*pte) + || !pte_write(*pte)) { + pte_unmap_unlock(pte, ptl); + goto bad_access; + } + + mem_value = *mem; + if (mem_value == oldval) + *mem = newval; + + pte_unmap_unlock(pte, ptl); + up_read(&mm->mmap_sem); + return mem_value; + + bad_access: + up_read(&mm->mmap_sem); + /* This is not necessarily a bad access, we can get here if + a memory we're trying to write to should be copied-on-write. + Make the kernel do the necessary page stuff, then re-iterate. + Simulate a write access fault to do that. */ + { + /* The first argument of the function corresponds to + D1, which is the first field of struct pt_regs. */ + struct pt_regs *fp = (struct pt_regs *)&newval; + + /* '3' is an RMW flag. */ + if (do_page_fault(fp, (unsigned long)mem, 3)) + /* If the do_page_fault() failed, we don't + have anything meaningful to return. + There should be a SIGSEGV pending for + the process. */ + return 0xdeadbeef; + } + } +} + +asmlinkage int sys_atomic_barrier(void) +{ + /* no code needed for uniprocs */ + return 0; +} |