1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_USER_H 3 #define _ASM_POWERPC_USER_H 4 5 #include <asm/ptrace.h> 6 #include <asm/page.h> 7 8 /* 9 * Adapted from <asm-alpha/user.h> 10 * 11 * Core file format: The core file is written in such a way that gdb 12 * can understand it and provide useful information to the user (under 13 * linux we use the `trad-core' bfd, NOT the osf-core). The file contents 14 * are as follows: 15 * 16 * upage: 1 page consisting of a user struct that tells gdb 17 * what is present in the file. Directly after this is a 18 * copy of the task_struct, which is currently not used by gdb, 19 * but it may come in handy at some point. All of the registers 20 * are stored as part of the upage. The upage should always be 21 * only one page long. 22 * data: The data segment follows next. We use current->end_text to 23 * current->brk to pick up all of the user variables, plus any memory 24 * that may have been sbrk'ed. No attempt is made to determine if a 25 * page is demand-zero or if a page is totally unused, we just cover 26 * the entire range. All of the addresses are rounded in such a way 27 * that an integral number of pages is written. 28 * stack: We need the stack information in order to get a meaningful 29 * backtrace. We need to write the data from usp to 30 * current->start_stack, so we round each of these in order to be able 31 * to write an integer number of pages. 32 */ 33 struct user { 34 struct user_pt_regs regs; /* entire machine state */ 35 size_t u_tsize; /* text size (pages) */ 36 size_t u_dsize; /* data size (pages) */ 37 size_t u_ssize; /* stack size (pages) */ 38 unsigned long start_code; /* text starting address */ 39 unsigned long start_data; /* data starting address */ 40 unsigned long start_stack; /* stack starting address */ 41 long int signal; /* signal causing core dump */ 42 unsigned long u_ar0; /* help gdb find registers */ 43 unsigned long magic; /* identifies a core file */ 44 char u_comm[32]; /* user command name */ 45 }; 46 47 #define NBPG PAGE_SIZE 48 #define UPAGES 1 49 #define HOST_TEXT_START_ADDR (u.start_code) 50 #define HOST_DATA_START_ADDR (u.start_data) 51 #define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG) 52 #endif /* _ASM_POWERPC_USER_H */ 53