1 // SPDX-License-Identifier: GPL-2.0 2 #include <unistd.h> 3 #include <stdio.h> 4 #include <string.h> 5 #include <internal/lib.h> // page_size 6 #include "machine.h" 7 #include "api/fs/fs.h" 8 #include "debug.h" 9 #include "symbol.h" 10 11 int arch__fix_module_text_start(u64 *start, u64 *size, const char *name) 12 { 13 u64 m_start = *start; 14 char path[PATH_MAX]; 15 16 snprintf(path, PATH_MAX, "module/%.*s/sections/.text", 17 (int)strlen(name) - 2, name + 1); 18 if (sysfs__read_ull(path, (unsigned long long *)start) < 0) { 19 pr_debug2("Using module %s start:%#lx\n", path, m_start); 20 *start = m_start; 21 } else { 22 /* Successful read of the modules segment text start address. 23 * Calculate difference between module start address 24 * in memory and module text segment start address. 25 * For example module load address is 0x3ff8011b000 26 * (from /proc/modules) and module text segment start 27 * address is 0x3ff8011b870 (from file above). 28 * 29 * Adjust the module size and subtract the GOT table 30 * size located at the beginning of the module. 31 */ 32 *size -= (*start - m_start); 33 } 34 35 return 0; 36 } 37 38 /* On s390 kernel text segment start is located at very low memory addresses, 39 * for example 0x10000. Modules are located at very high memory addresses, 40 * for example 0x3ff xxxx xxxx. The gap between end of kernel text segment 41 * and beginning of first module's text segment is very big. 42 * Therefore do not fill this gap and do not assign it to the kernel dso map. 43 */ 44 void arch__symbols__fixup_end(struct symbol *p, struct symbol *c) 45 { 46 if (strchr(p->name, '[') == NULL && strchr(c->name, '[')) 47 /* Last kernel symbol mapped to end of page */ 48 p->end = roundup(p->end, page_size); 49 else 50 p->end = c->start; 51 pr_debug4("%s sym:%s end:%#lx\n", __func__, p->name, p->end); 52 } 53