1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef _ASM_POWERPC_USER_H 3*4882a593Smuzhiyun #define _ASM_POWERPC_USER_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <asm/ptrace.h> 6*4882a593Smuzhiyun #include <asm/page.h> 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun /* 9*4882a593Smuzhiyun * Adapted from <asm-alpha/user.h> 10*4882a593Smuzhiyun * 11*4882a593Smuzhiyun * Core file format: The core file is written in such a way that gdb 12*4882a593Smuzhiyun * can understand it and provide useful information to the user (under 13*4882a593Smuzhiyun * linux we use the `trad-core' bfd, NOT the osf-core). The file contents 14*4882a593Smuzhiyun * are as follows: 15*4882a593Smuzhiyun * 16*4882a593Smuzhiyun * upage: 1 page consisting of a user struct that tells gdb 17*4882a593Smuzhiyun * what is present in the file. Directly after this is a 18*4882a593Smuzhiyun * copy of the task_struct, which is currently not used by gdb, 19*4882a593Smuzhiyun * but it may come in handy at some point. All of the registers 20*4882a593Smuzhiyun * are stored as part of the upage. The upage should always be 21*4882a593Smuzhiyun * only one page long. 22*4882a593Smuzhiyun * data: The data segment follows next. We use current->end_text to 23*4882a593Smuzhiyun * current->brk to pick up all of the user variables, plus any memory 24*4882a593Smuzhiyun * that may have been sbrk'ed. No attempt is made to determine if a 25*4882a593Smuzhiyun * page is demand-zero or if a page is totally unused, we just cover 26*4882a593Smuzhiyun * the entire range. All of the addresses are rounded in such a way 27*4882a593Smuzhiyun * that an integral number of pages is written. 28*4882a593Smuzhiyun * stack: We need the stack information in order to get a meaningful 29*4882a593Smuzhiyun * backtrace. We need to write the data from usp to 30*4882a593Smuzhiyun * current->start_stack, so we round each of these in order to be able 31*4882a593Smuzhiyun * to write an integer number of pages. 32*4882a593Smuzhiyun */ 33*4882a593Smuzhiyun struct user { 34*4882a593Smuzhiyun struct user_pt_regs regs; /* entire machine state */ 35*4882a593Smuzhiyun size_t u_tsize; /* text size (pages) */ 36*4882a593Smuzhiyun size_t u_dsize; /* data size (pages) */ 37*4882a593Smuzhiyun size_t u_ssize; /* stack size (pages) */ 38*4882a593Smuzhiyun unsigned long start_code; /* text starting address */ 39*4882a593Smuzhiyun unsigned long start_data; /* data starting address */ 40*4882a593Smuzhiyun unsigned long start_stack; /* stack starting address */ 41*4882a593Smuzhiyun long int signal; /* signal causing core dump */ 42*4882a593Smuzhiyun unsigned long u_ar0; /* help gdb find registers */ 43*4882a593Smuzhiyun unsigned long magic; /* identifies a core file */ 44*4882a593Smuzhiyun char u_comm[32]; /* user command name */ 45*4882a593Smuzhiyun }; 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun #define NBPG PAGE_SIZE 48*4882a593Smuzhiyun #define UPAGES 1 49*4882a593Smuzhiyun #define HOST_TEXT_START_ADDR (u.start_code) 50*4882a593Smuzhiyun #define HOST_DATA_START_ADDR (u.start_data) 51*4882a593Smuzhiyun #define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG) 52*4882a593Smuzhiyun #endif /* _ASM_POWERPC_USER_H */ 53