2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
10 #include "ptrace_user.h"
11 /* Grr, asm/user.h includes asm/ptrace.h, so has to follow ptrace_user.h */
13 #include "kern_util.h"
14 #include "sysdep/thread.h"
17 #include "uml-config.h"
18 #include "user_util.h"
20 int ptrace_getregs(long pid, unsigned long *regs_out)
22 if (ptrace(PTRACE_GETREGS, pid, 0, regs_out) < 0)
27 int ptrace_setregs(long pid, unsigned long *regs)
29 if (ptrace(PTRACE_SETREGS, pid, 0, regs) < 0)
34 int ptrace_getfpregs(long pid, unsigned long *regs)
36 if (ptrace(PTRACE_GETFPREGS, pid, 0, regs) < 0)
41 int ptrace_setfpregs(long pid, unsigned long *regs)
43 if (ptrace(PTRACE_SETFPREGS, pid, 0, regs) < 0)
48 /* All the below stuff is of interest for TT mode only */
49 static void write_debugregs(int pid, unsigned long *regs)
55 nregs = ARRAY_SIZE(dummy->u_debugreg);
56 for(i = 0; i < nregs; i++){
57 if((i == 4) || (i == 5)) continue;
58 if(ptrace(PTRACE_POKEUSR, pid, &dummy->u_debugreg[i],
60 printk("write_debugregs - ptrace failed on "
61 "register %d, value = 0x%lx, errno = %d\n", i,
66 static void read_debugregs(int pid, unsigned long *regs)
72 nregs = ARRAY_SIZE(dummy->u_debugreg);
73 for(i = 0; i < nregs; i++){
74 regs[i] = ptrace(PTRACE_PEEKUSR, pid,
75 &dummy->u_debugreg[i], 0);
79 /* Accessed only by the tracing thread */
80 static unsigned long kernel_debugregs[8] = { [ 0 ... 7 ] = 0 };
82 void arch_enter_kernel(void *task, int pid)
84 read_debugregs(pid, TASK_DEBUGREGS(task));
85 write_debugregs(pid, kernel_debugregs);
88 void arch_leave_kernel(void *task, int pid)
90 read_debugregs(pid, kernel_debugregs);
91 write_debugregs(pid, TASK_DEBUGREGS(task));
94 #ifdef UML_CONFIG_PT_PROXY
95 /* Accessed only by the tracing thread */
96 static int debugregs_seq;
98 /* Only called by the ptrace proxy */
99 void ptrace_pokeuser(unsigned long addr, unsigned long data)
101 if((addr < offsetof(struct user, u_debugreg[0])) ||
102 (addr > offsetof(struct user, u_debugreg[7])))
104 addr -= offsetof(struct user, u_debugreg[0]);
106 if(kernel_debugregs[addr] == data) return;
108 kernel_debugregs[addr] = data;
112 static void update_debugregs_cb(void *arg)
114 int pid = *((int *) arg);
116 write_debugregs(pid, kernel_debugregs);
119 /* Optimized out in its header when not defined */
120 void update_debugregs(int seq)
124 if(seq == debugregs_seq) return;
127 initial_thread_cb(update_debugregs_cb, &me);
132 * Overrides for Emacs so that we follow Linus's tabbing style.
133 * Emacs will notice this stuff at the end of the file and automatically
134 * adjust the settings for this buffer only. This must remain at the end
136 * ---------------------------------------------------------------------------
138 * c-file-style: "linux"