diff options
Diffstat (limited to 'arch/um/sys-x86_64/syscalls.c')
| -rw-r--r-- | arch/um/sys-x86_64/syscalls.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/arch/um/sys-x86_64/syscalls.c b/arch/um/sys-x86_64/syscalls.c new file mode 100644 index 000000000000..68205a03364c --- /dev/null +++ b/arch/um/sys-x86_64/syscalls.c @@ -0,0 +1,186 @@ +/* + * Copyright 2003 PathScale, Inc. + * + * Licensed under the GPL + */ + +#include "linux/linkage.h" +#include "linux/slab.h" +#include "linux/shm.h" +#include "asm/uaccess.h" +#define __FRAME_OFFSETS +#include "asm/ptrace.h" +#include "asm/unistd.h" +#include "asm/prctl.h" /* XXX This should get the constants from libc */ +#include "choose-mode.h" + +asmlinkage long wrap_sys_shmat(int shmid, char __user *shmaddr, int shmflg) +{ + unsigned long raddr; + + return do_shmat(shmid, shmaddr, shmflg, &raddr) ?: (long) raddr; +} + +#ifdef CONFIG_MODE_TT +extern int modify_ldt(int func, void *ptr, unsigned long bytecount); + +long sys_modify_ldt_tt(int func, void *ptr, unsigned long bytecount) +{ + /* XXX This should check VERIFY_WRITE depending on func, check this + * in i386 as well. + */ + if (!access_ok(VERIFY_READ, ptr, bytecount)) + return -EFAULT; + return(modify_ldt(func, ptr, bytecount)); +} +#endif + +#ifdef CONFIG_MODE_SKAS +extern int userspace_pid[]; + +long sys_modify_ldt_skas(int func, void *ptr, unsigned long bytecount) +{ + struct ptrace_ldt ldt; + void *buf; + int res, n; + + buf = kmalloc(bytecount, GFP_KERNEL); + if(buf == NULL) + return(-ENOMEM); + + res = 0; + + switch(func){ + case 1: + case 0x11: + res = copy_from_user(buf, ptr, bytecount); + break; + } + + if(res != 0){ + res = -EFAULT; + goto out; + } + + ldt = ((struct ptrace_ldt) { .func = func, + .ptr = buf, + .bytecount = bytecount }); +#warning Need to look up userspace_pid by cpu + res = ptrace(PTRACE_LDT, userspace_pid[0], 0, (unsigned long) &ldt); + if(res < 0) + goto out; + + switch(func){ + case 0: + case 2: + n = res; + res = copy_to_user(ptr, buf, n); + if(res != 0) + res = -EFAULT; + else + res = n; + break; + } + + out: + kfree(buf); + return(res); +} +#endif + +long sys_modify_ldt(int func, void *ptr, unsigned long bytecount) +{ + return(CHOOSE_MODE_PROC(sys_modify_ldt_tt, sys_modify_ldt_skas, func, + ptr, bytecount)); +} + +#ifdef CONFIG_MODE_TT +extern long arch_prctl(int code, unsigned long addr); + +static long arch_prctl_tt(int code, unsigned long addr) +{ + unsigned long tmp; + long ret; + + switch(code){ + case ARCH_SET_GS: + case ARCH_SET_FS: + ret = arch_prctl(code, addr); + break; + case ARCH_GET_FS: + case ARCH_GET_GS: + ret = arch_prctl(code, (unsigned long) &tmp); + if(!ret) + ret = put_user(tmp, &addr); + break; + default: + ret = -EINVAL; + break; + } + + return(ret); +} +#endif + +#ifdef CONFIG_MODE_SKAS + +static long arch_prctl_skas(int code, unsigned long addr) +{ + long ret = 0; + + switch(code){ + case ARCH_SET_GS: + current->thread.regs.regs.skas.regs[GS_BASE / sizeof(unsigned long)] = addr; + break; + case ARCH_SET_FS: + current->thread.regs.regs.skas.regs[FS_BASE / sizeof(unsigned long)] = addr; + break; + case ARCH_GET_FS: + ret = put_user(current->thread.regs.regs.skas.regs[GS / sizeof(unsigned long)], &addr); + break; + case ARCH_GET_GS: + ret = put_user(current->thread.regs.regs.skas.regs[FS / sizeof(unsigned \ +long)], &addr); + break; + default: + ret = -EINVAL; + break; + } + + return(ret); +} +#endif + +long sys_arch_prctl(int code, unsigned long addr) +{ + return(CHOOSE_MODE_PROC(arch_prctl_tt, arch_prctl_skas, code, addr)); +} + +long sys_clone(unsigned long clone_flags, unsigned long newsp, + void __user *parent_tid, void __user *child_tid) +{ + long ret; + + /* XXX: normal arch do here this pass, and also pass the regs to + * do_fork, instead of NULL. Currently the arch-independent code + * ignores these values, while the UML code (actually it's + * copy_thread) does the right thing. But this should change, + probably. */ + /*if (!newsp) + newsp = UPT_SP(current->thread.regs);*/ + current->thread.forking = 1; + ret = do_fork(clone_flags, newsp, NULL, 0, parent_tid, child_tid); + current->thread.forking = 0; + return(ret); +} + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ |