1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2004 PathScale, Inc 4 * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 5 */ 6 7 #include <errno.h> 8 #include <string.h> 9 #include <sys/ptrace.h> 10 #include <sysdep/ptrace.h> 11 #include <sysdep/ptrace_user.h> 12 #include <registers.h> 13 14 int save_registers(int pid, struct uml_pt_regs *regs) 15 { 16 int err; 17 18 err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp); 19 if (err < 0) 20 return -errno; 21 return 0; 22 } 23 24 int restore_registers(int pid, struct uml_pt_regs *regs) 25 { 26 int err; 27 28 err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp); 29 if (err < 0) 30 return -errno; 31 return 0; 32 } 33 34 /* This is set once at boot time and not changed thereafter */ 35 36 static unsigned long exec_regs[MAX_REG_NR]; 37 static unsigned long exec_fp_regs[FP_SIZE]; 38 39 int init_registers(int pid) 40 { 41 int err; 42 43 err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs); 44 if (err < 0) 45 return -errno; 46 47 arch_init_registers(pid); 48 get_fp_registers(pid, exec_fp_regs); 49 return 0; 50 } 51 52 void get_safe_registers(unsigned long *regs, unsigned long *fp_regs) 53 { 54 memcpy(regs, exec_regs, sizeof(exec_regs)); 55 56 if (fp_regs) 57 memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs)); 58 } 59