diff options
Diffstat (limited to 'arch/um/os-Linux/skas')
-rw-r--r-- | arch/um/os-Linux/skas/mem.c | 51 | ||||
-rw-r--r-- | arch/um/os-Linux/skas/process.c | 122 | ||||
-rw-r--r-- | arch/um/os-Linux/skas/trap.c | 17 |
3 files changed, 103 insertions, 87 deletions
diff --git a/arch/um/os-Linux/skas/mem.c b/arch/um/os-Linux/skas/mem.c index af0790719b7..8e490fff3d4 100644 --- a/arch/um/os-Linux/skas/mem.c +++ b/arch/um/os-Linux/skas/mem.c @@ -24,10 +24,11 @@ #include "uml-config.h" #include "sysdep/ptrace.h" #include "sysdep/stub.h" +#include "init.h" extern unsigned long batch_syscall_stub, __syscall_stub_start; -extern void wait_stub_done(int pid, int sig, char * fname); +extern void wait_stub_done(int pid); static inline unsigned long *check_init_stack(struct mm_id * mm_idp, unsigned long *stack) @@ -39,6 +40,19 @@ static inline unsigned long *check_init_stack(struct mm_id * mm_idp, return stack; } +static unsigned long syscall_regs[MAX_REG_NR]; + +static int __init init_syscall_regs(void) +{ + get_safe_registers(syscall_regs, NULL); + syscall_regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE + + ((unsigned long) &batch_syscall_stub - + (unsigned long) &__syscall_stub_start); + return 0; +} + +__initcall(init_syscall_regs); + extern int proc_mm; int single_count = 0; @@ -47,12 +61,11 @@ int multi_op_count = 0; static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr) { - unsigned long regs[MAX_REG_NR]; int n, i; long ret, offset; unsigned long * data; unsigned long * syscall; - int pid = mm_idp->u.pid; + int err, pid = mm_idp->u.pid; if(proc_mm) #warning Need to look up userspace_pid by cpu @@ -60,21 +73,21 @@ static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr) multi_count++; - get_safe_registers(regs, NULL); - regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE + - ((unsigned long) &batch_syscall_stub - - (unsigned long) &__syscall_stub_start); - - n = ptrace_setregs(pid, regs); + n = ptrace_setregs(pid, syscall_regs); if(n < 0){ printk("Registers - \n"); for(i = 0; i < MAX_REG_NR; i++) - printk("\t%d\t0x%lx\n", i, regs[i]); + printk("\t%d\t0x%lx\n", i, syscall_regs[i]); panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n", -n); } - wait_stub_done(pid, 0, "do_syscall_stub"); + err = ptrace(PTRACE_CONT, pid, 0, 0); + if(err) + panic("Failed to continue stub, pid = %d, errno = %d\n", pid, + errno); + + wait_stub_done(pid); /* When the stub stops, we find the following values on the * beginning of the stack: @@ -176,14 +189,10 @@ long syscall_stub_data(struct mm_id * mm_idp, return 0; } -int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, - int r, int w, int x, int phys_fd, unsigned long long offset, - int done, void **data) +int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, int prot, + int phys_fd, unsigned long long offset, int done, void **data) { - int prot, ret; - - prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) | - (x ? PROT_EXEC : 0); + int ret; if(proc_mm){ struct proc_mm_op map; @@ -253,13 +262,11 @@ int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len, } int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len, - int r, int w, int x, int done, void **data) + unsigned int prot, int done, void **data) { struct proc_mm_op protect; - int prot, ret; + int ret; - prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) | - (x ? PROT_EXEC : 0); if(proc_mm){ int fd = mm_idp->u.mm_fd; diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c index 1f39f2bf7ce..5c088a55396 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -34,6 +34,7 @@ #include "process.h" #include "longjmp.h" #include "kern_constants.h" +#include "as-layout.h" int is_skas_winch(int pid, int fd, void *data) { @@ -60,37 +61,42 @@ static int ptrace_dump_regs(int pid) return 0; } -void wait_stub_done(int pid, int sig, char * fname) +/* + * Signals that are OK to receive in the stub - we'll just continue it. + * SIGWINCH will happen when UML is inside a detached screen. + */ +#define STUB_SIG_MASK ((1 << SIGVTALRM) | (1 << SIGWINCH)) + +/* Signals that the stub will finish with - anything else is an error */ +#define STUB_DONE_MASK ((1 << SIGUSR1) | (1 << SIGTRAP)) + +void wait_stub_done(int pid) { int n, status, err; - do { - if ( sig != -1 ) { - err = ptrace(PTRACE_CONT, pid, 0, sig); - if(err) - panic("%s : continue failed, errno = %d\n", - fname, errno); - } - sig = 0; - + while(1){ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED)); - } while((n >= 0) && WIFSTOPPED(status) && - ((WSTOPSIG(status) == SIGVTALRM) || - /* running UML inside a detached screen can cause - * SIGWINCHes - */ - (WSTOPSIG(status) == SIGWINCH))); - - if((n < 0) || !WIFSTOPPED(status) || - (WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){ - err = ptrace_dump_regs(pid); + if((n < 0) || !WIFSTOPPED(status)) + goto bad_wait; + + if(((1 << WSTOPSIG(status)) & STUB_SIG_MASK) == 0) + break; + + err = ptrace(PTRACE_CONT, pid, 0, 0); if(err) - printk("Failed to get registers from stub, " - "errno = %d\n", -err); - panic("%s : failed to wait for SIGUSR1/SIGTRAP, " - "pid = %d, n = %d, errno = %d, status = 0x%x\n", - fname, pid, n, errno, status); + panic("wait_stub_done : continue failed, errno = %d\n", + errno); } + + if(((1 << WSTOPSIG(status)) & STUB_DONE_MASK) != 0) + return; + +bad_wait: + err = ptrace_dump_regs(pid); + if(err) + printk("Failed to get registers from stub, errno = %d\n", -err); + panic("wait_stub_done : failed to wait for SIGUSR1/SIGTRAP, pid = %d, " + "n = %d, errno = %d, status = 0x%x\n", pid, n, errno, status); } extern unsigned long current_stub_stack(void); @@ -112,7 +118,11 @@ void get_skas_faultinfo(int pid, struct faultinfo * fi) sizeof(struct ptrace_faultinfo)); } else { - wait_stub_done(pid, SIGSEGV, "get_skas_faultinfo"); + err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV); + if(err) + panic("Failed to continue stub, pid = %d, errno = %d\n", + pid, errno); + wait_stub_done(pid); /* faultinfo is prepared by the stub-segv-handler at start of * the stub stack page. We just have to copy it. @@ -304,10 +314,13 @@ void userspace(union uml_pt_regs *regs) UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */ if(WIFSTOPPED(status)){ - switch(WSTOPSIG(status)){ + int sig = WSTOPSIG(status); + switch(sig){ case SIGSEGV: - if(PTRACE_FULL_FAULTINFO || !ptrace_faultinfo) - user_signal(SIGSEGV, regs, pid); + if(PTRACE_FULL_FAULTINFO || !ptrace_faultinfo){ + get_skas_faultinfo(pid, ®s->skas.faultinfo); + (*sig_info[SIGSEGV])(SIGSEGV, regs); + } else handle_segv(pid, regs); break; case SIGTRAP + 0x80: @@ -322,11 +335,13 @@ void userspace(union uml_pt_regs *regs) case SIGBUS: case SIGFPE: case SIGWINCH: - user_signal(WSTOPSIG(status), regs, pid); + block_signals(); + (*sig_info[sig])(sig, regs); + unblock_signals(); break; default: printk("userspace - child stopped with signal " - "%d\n", WSTOPSIG(status)); + "%d\n", sig); } pid = userspace_pid[0]; interrupt_end(); @@ -338,11 +353,29 @@ void userspace(union uml_pt_regs *regs) } } +static unsigned long thread_regs[MAX_REG_NR]; +static unsigned long thread_fp_regs[HOST_FP_SIZE]; + +static int __init init_thread_regs(void) +{ + get_safe_registers(thread_regs, thread_fp_regs); + /* Set parent's instruction pointer to start of clone-stub */ + thread_regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE + + (unsigned long) stub_clone_handler - + (unsigned long) &__syscall_stub_start; + thread_regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + PAGE_SIZE - + sizeof(void *); +#ifdef __SIGNAL_FRAMESIZE + thread_regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE; +#endif + return 0; +} + +__initcall(init_thread_regs); + int copy_context_skas0(unsigned long new_stack, int pid) { int err; - unsigned long regs[MAX_REG_NR]; - unsigned long fp_regs[HOST_FP_SIZE]; unsigned long current_stack = current_stub_stack(); struct stub_data *data = (struct stub_data *) current_stack; struct stub_data *child_data = (struct stub_data *) new_stack; @@ -357,23 +390,12 @@ int copy_context_skas0(unsigned long new_stack, int pid) .timer = ((struct itimerval) { { 0, 1000000 / hz() }, { 0, 1000000 / hz() }})}); - get_safe_registers(regs, fp_regs); - - /* Set parent's instruction pointer to start of clone-stub */ - regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE + - (unsigned long) stub_clone_handler - - (unsigned long) &__syscall_stub_start; - regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + PAGE_SIZE - - sizeof(void *); -#ifdef __SIGNAL_FRAMESIZE - regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE; -#endif - err = ptrace_setregs(pid, regs); + err = ptrace_setregs(pid, thread_regs); if(err < 0) panic("copy_context_skas0 : PTRACE_SETREGS failed, " "pid = %d, errno = %d\n", pid, -err); - err = ptrace_setfpregs(pid, fp_regs); + err = ptrace_setfpregs(pid, thread_fp_regs); if(err < 0) panic("copy_context_skas0 : PTRACE_SETFPREGS failed, " "pid = %d, errno = %d\n", pid, -err); @@ -384,7 +406,11 @@ int copy_context_skas0(unsigned long new_stack, int pid) /* Wait, until parent has finished its work: read child's pid from * parent's stack, and check, if bad result. */ - wait_stub_done(pid, 0, "copy_context_skas0"); + err = ptrace(PTRACE_CONT, pid, 0, 0); + if(err) + panic("Failed to continue new process, pid = %d, " + "errno = %d\n", pid, errno); + wait_stub_done(pid); pid = data->err; if(pid < 0) @@ -394,7 +420,7 @@ int copy_context_skas0(unsigned long new_stack, int pid) /* Wait, until child has finished too: read child's result from * child's stack and check it. */ - wait_stub_done(pid, -1, "copy_context_skas0"); + wait_stub_done(pid); if (child_data->err != UML_CONFIG_STUB_DATA) panic("copy_context_skas0 - stub-child reports error %ld\n", child_data->err); diff --git a/arch/um/os-Linux/skas/trap.c b/arch/um/os-Linux/skas/trap.c index 5110eff51b9..3b600c2e63b 100644 --- a/arch/um/os-Linux/skas/trap.c +++ b/arch/um/os-Linux/skas/trap.c @@ -64,20 +64,3 @@ void sig_handler_common_skas(int sig, void *sc_ptr) errno = save_errno; r->skas.is_user = save_user; } - -extern int ptrace_faultinfo; - -void user_signal(int sig, union uml_pt_regs *regs, int pid) -{ - void (*handler)(int, union uml_pt_regs *); - int segv = ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) || - (sig == SIGILL) || (sig == SIGTRAP)); - - if (segv) - get_skas_faultinfo(pid, ®s->skas.faultinfo); - - handler = sig_info[sig]; - handler(sig, (union uml_pt_regs *) regs); - - unblock_signals(); -} |