/* * Kernel Debugger Architecture Independent Support Functions * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (c) 1999-2004 Silicon Graphics, Inc. All Rights Reserved. * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved. * 03/02/13 added new 2.5 kallsyms <xavier.bru@bull.net> */ #include <stdarg.h>#include <linux/types.h>#include <linux/sched.h>#include <linux/mm.h>#include <linux/kallsyms.h>#include <linux/stddef.h>#include <linux/vmalloc.h>#include <linux/ptrace.h>#include <linux/module.h>#include <linux/highmem.h>#include <linux/hardirq.h>#include <linux/delay.h>#include <linux/uaccess.h>#include <linux/kdb.h>#include <linux/slab.h>#include "kdb_private.h" /* * kdbgetsymval - Return the address of the given symbol. * * Parameters: * symname Character string containing symbol name * symtab Structure to receive results * Returns: * 0 Symbol not found, symtab zero filled * 1 Symbol mapped to module/symbol/section, data in symtab */int kdbgetsymval(const char *symname, kdb_symtab_t *symtab){ kdb_dbg_printf(AR, "symname=%s, symtab=%px\n", symname, symtab); memset(symtab, 0, sizeof(*symtab)); symtab->sym_start = kallsyms_lookup_name(symname); if (symtab->sym_start) { kdb_dbg_printf(AR, "returns 1, symtab->sym_start=0x%lx\n", symtab->sym_start); return 1; } kdb_dbg_printf(AR, "returns 0\n"); return 0;}EXPORT_SYMBOL(kdbgetsymval); static char *kdb_name_table[100]; /* arbitrary size */ /* * kdbnearsym - Return the name of the symbol with the nearest address * less than 'addr'. * * Parameters: * addr Address to check for symbol near * symtab Structure to receive results * Returns: * 0 No sections contain this address, symtab zero filled * 1 Address mapped to module/symbol/section, data in symtab * Remarks: * 2.6 kallsyms has a "feature" where it unpacks the name into a * string. If that string is reused before the caller expects it * then the caller sees its string change without warning. To * avoid cluttering up the main kdb code with lots of kdb_strdup, * tests and kfree calls, kdbnearsym maintains an LRU list of the * last few unique strings. The list is sized large enough to * hold active strings, no kdb caller of kdbnearsym makes more * than ~20 later calls before using a saved value. */int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab){ int ret = 0; unsigned long symbolsize = 0; unsigned long offset = 0;#define knt1_size 128 /* must be >= kallsyms table size */ char *knt1 = NULL; kdb_dbg_printf(AR, "addr=0x%lx, symtab=%px\n", addr, symtab); memset(symtab, 0, sizeof(*symtab)); if (addr < 4096) goto out; knt1 = debug_kmalloc(knt1_size, GFP_ATOMIC); if (!knt1) { kdb_func_printf("addr=0x%lx cannot kmalloc knt1\n", addr); goto out; } symtab->sym_name = kallsyms_lookup(addr, &symbolsize , &offset, (char **)(&symtab->mod_name), knt1); if (offset > 8*1024*1024) { symtab->sym_name = NULL; addr = offset = symbolsize = 0; } symtab->sym_start = addr - offset; symtab->sym_end = symtab->sym_start + symbolsize; ret = symtab->sym_name != NULL && *(symtab->sym_name) != '\0'; if (ret) { int i; /* Another 2.6 kallsyms "feature". Sometimes the sym_name is * set but the buffer passed into kallsyms_lookup is not used, * so it contains garbage. The caller has to work out which * buffer needs to be saved. * * What was Rusty smoking when he wrote that code? */ if (symtab->sym_name != knt1) { strncpy(knt1, symtab->sym_name, knt1_size); knt1[knt1_size-1] = '\0'; } for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) { if (kdb_name_table[i] && strcmp(kdb_name_table[i], knt1) == 0) break; } if (i >= ARRAY_SIZE(kdb_name_table)) { debug_kfree(kdb_name_table[0]); memmove(kdb_name_table, kdb_name_table+1, sizeof(kdb_name_table[0]) * (ARRAY_SIZE(kdb_name_table)-1)); } else { debug_kfree(knt1); knt1 = kdb_name_table[i]; memmove(kdb_name_table+i, kdb_name_table+i+1, sizeof(kdb_name_table[0]) * (ARRAY_SIZE(kdb_name_table)-i-1)); } i = ARRAY_SIZE(kdb_name_table) - 1; kdb_name_table[i] = knt1; symtab->sym_name = kdb_name_table[i]; knt1 = NULL; } if (symtab->mod_name == NULL) symtab->mod_name = "kernel"; kdb_dbg_printf(AR, "returns %d symtab->sym_start=0x%lx, symtab->mod_name=%px, symtab->sym_name=%px (%s)\n", ret, symtab->sym_start, symtab->mod_name, symtab->sym_name, symtab->sym_name); out: debug_kfree(knt1); return ret;} void kdbnearsym_cleanup(void){ int i; for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) { if (kdb_name_table[i]) { debug_kfree(kdb_name_table[i]); kdb_name_table[i] = NULL; } }} static char ks_namebuf[KSYM_NAME_LEN+1], ks_namebuf_prev[KSYM_NAME_LEN+1]; /* * kallsyms_symbol_complete * * Parameters: * prefix_name prefix of a symbol name to lookup * max_len maximum length that can be returned * Returns: * Number of symbols which match the given prefix. * Notes: * prefix_name is changed to contain the longest unique prefix that * starts with this prefix (tab completion). */int kallsyms_symbol_complete(char *prefix_name, int max_len){ loff_t pos = 0; int prefix_len = strlen(prefix_name), prev_len = 0; int i, number = 0; const char *name; while ((name = kdb_walk_kallsyms(&pos))) { if (strncmp(name, prefix_name, prefix_len) == 0) { strscpy(ks_namebuf, name, sizeof(ks_namebuf)); /* Work out the longest name that matches the prefix */ if (++number == 1) { prev_len = min_t(int, max_len-1, strlen(ks_namebuf)); memcpy(ks_namebuf_prev, ks_namebuf, prev_len); ks_namebuf_prev[prev_len] = '\0'; continue; } for (i = 0; i < prev_len; i++) { if (ks_namebuf[i] != ks_namebuf_prev[i]) { prev_len = i; ks_namebuf_prev[i] = '\0'; break; } } } } if (prev_len > prefix_len) memcpy(prefix_name, ks_namebuf_prev, prev_len+1); return number;} /* * kallsyms_symbol_next * * Parameters: * prefix_name prefix of a symbol name to lookup * flag 0 means search from the head, 1 means continue search. * buf_size maximum length that can be written to prefix_name * buffer * Returns: * 1 if a symbol matches the given prefix. * 0 if no string found */int kallsyms_symbol_next(char *prefix_name, int flag, int buf_size){ int prefix_len = strlen(prefix_name); static loff_t pos; const char *name; if (!flag) pos = 0; while ((name = kdb_walk_kallsyms(&pos))) { if (!strncmp(name, prefix_name, prefix_len)) return strscpy(prefix_name, name, buf_size); } return 0;} /* * kdb_symbol_print - Standard method for printing a symbol name and offset. * Inputs: * addr Address to be printed. * symtab Address of symbol data, if NULL this routine does its * own lookup. * punc Punctuation for string, bit field. * Remarks: * The string and its punctuation is only printed if the address * is inside the kernel, except that the value is always printed * when requested. */void kdb_symbol_print(unsigned long addr, const kdb_symtab_t *symtab_p, unsigned int punc){ kdb_symtab_t symtab, *symtab_p2; if (symtab_p) { symtab_p2 = (kdb_symtab_t *)symtab_p; } else { symtab_p2 = &symtab; kdbnearsym(addr, symtab_p2); } if (!(symtab_p2->sym_name || (punc & KDB_SP_VALUE))) return; if (punc & KDB_SP_SPACEB) kdb_printf(" "); if (punc & KDB_SP_VALUE) kdb_printf(kdb_machreg_fmt0, addr); if (symtab_p2->sym_name) { if (punc & KDB_SP_VALUE) kdb_printf(" "); if (punc & KDB_SP_PAREN) kdb_printf("("); if (strcmp(symtab_p2->mod_name, "kernel")) kdb_printf("[%s]", symtab_p2->mod_name); kdb_printf("%s", symtab_p2->sym_name); if (addr != symtab_p2->sym_start) kdb_printf("+0x%lx", addr - symtab_p2->sym_start); if (punc & KDB_SP_SYMSIZE) kdb_printf("/0x%lx", symtab_p2->sym_end - symtab_p2->sym_start); if (punc & KDB_SP_PAREN) kdb_printf(")"); } if (punc & KDB_SP_SPACEA) kdb_printf(" "); if (punc & KDB_SP_NEWLINE) kdb_printf("\n");} /* * kdb_strdup - kdb equivalent of strdup, for disasm code. * Inputs: * str The string to duplicate. * type Flags to kmalloc for the new string. * Returns: * Address of the new string, NULL if storage could not be allocated. * Remarks: * This is not in lib/string.c because it uses kmalloc which is not * available when string.o is used in boot loaders. */char *kdb_strdup(const char *str, gfp_t type){ int n = strlen(str)+1; char *s = kmalloc(n, type); if (!s) return NULL; return strcpy(s, str);} /* * kdb_getarea_size - Read an area of data. The kdb equivalent of * copy_from_user, with kdb messages for invalid addresses. * Inputs: * res Pointer to the area to receive the result. * addr Address of the area to copy. * size Size of the area. * Returns: * 0 for success, < 0 for error. */int kdb_getarea_size(void *res, unsigned long addr, size_t size){ int ret = copy_from_kernel_nofault((char *)res, (char *)addr, size); if (ret) { if (!KDB_STATE(SUPPRESS)) { kdb_func_printf("Bad address 0x%lx\n", addr); KDB_STATE_SET(SUPPRESS); } ret = KDB_BADADDR; } else { KDB_STATE_CLEAR(SUPPRESS); } return ret;} /* * kdb_putarea_size - Write an area of data. The kdb equivalent of * copy_to_user, with kdb messages for invalid addresses. * Inputs: * addr Address of the area to write to. * res Pointer to the area holding the data. * size Size of the area. * Returns: * 0 for success, < 0 for error. */int kdb_putarea_size(unsigned long addr, void *res, size_t size){ int ret = copy_from_kernel_nofault((char *)addr, (char *)res, size); if (ret) { if (!KDB_STATE(SUPPRESS)) { kdb_func_printf("Bad address 0x%lx\n", addr); KDB_STATE_SET(SUPPRESS); } ret = KDB_BADADDR; } else { KDB_STATE_CLEAR(SUPPRESS); } return ret;} /* * kdb_getphys - Read data from a physical address. Validate the * address is in range, use kmap_atomic() to get data * similar to kdb_getarea() - but for phys addresses * Inputs: * res Pointer to the word to receive the result * addr Physical address of the area to copy * size Size of the area * Returns: * 0 for success, < 0 for error. */static int kdb_getphys(void *res, unsigned long addr, size_t size){ unsigned long pfn; void *vaddr; struct page *page; pfn = (addr >> PAGE_SHIFT); if (!pfn_valid(pfn)) return 1; page = pfn_to_page(pfn); vaddr = kmap_atomic(page); memcpy(res, vaddr + (addr & (PAGE_SIZE - 1)), size); kunmap_atomic(vaddr); return 0;} /* * kdb_getphysword * Inputs: * word Pointer to the word to receive the result. * addr Address of the area to copy. * size Size of the area. * Returns: * 0 for success, < 0 for error. */int kdb_getphysword(unsigned long *word, unsigned long addr, size_t size){ int diag; __u8 w1; __u16 w2; __u32 w4; __u64 w8; *word = 0; /* Default value if addr or size is invalid */ switch (size) { case 1: diag = kdb_getphys(&w1, addr, sizeof(w1)); if (!diag) *word = w1; break; case 2: diag = kdb_getphys(&w2, addr, sizeof(w2)); if (!diag) *word = w2; break; case 4: diag = kdb_getphys(&w4, addr, sizeof(w4)); if (!diag) *word = w4; break; case 8: if (size <= sizeof(*word)) { diag = kdb_getphys(&w8, addr, sizeof(w8)); if (!diag) *word = w8; break; } fallthrough; default: diag = KDB_BADWIDTH; kdb_func_printf("bad width %zu\n", size); } return diag;} /* * kdb_getword - Read a binary value. Unlike kdb_getarea, this treats * data as numbers. * Inputs: * word Pointer to the word to receive the result. * addr Address of the area to copy. * size Size of the area. * Returns: * 0 for success, < 0 for error. */int kdb_getword(unsigned long *word, unsigned long addr, size_t size){ int diag; __u8 w1; __u16 w2; __u32 w4; __u64 w8; *word = 0; /* Default value if addr or size is invalid */ switch (size) { case 1: diag = kdb_getarea(w1, addr); if (!diag) *word = w1; break; case 2: diag = kdb_getarea(w2, addr); if (!diag) *word = w2; break; case 4: diag = kdb_getarea(w4, addr); if (!diag) *word = w4; break; case 8: if (size <= sizeof(*word)) { diag = kdb_getarea(w8, addr); if (!diag) *word = w8; break; } fallthrough; default: diag = KDB_BADWIDTH; kdb_func_printf("bad width %zu\n", size); } return diag;} /* * kdb_putword - Write a binary value. Unlike kdb_putarea, this * treats data as numbers. * Inputs: * addr Address of the area to write to.. * word The value to set. * size Size of the area. * Returns: * 0 for success, < 0 for error. */int kdb_putword(unsigned long addr, unsigned long word, size_t size){ int diag; __u8 w1; __u16 w2; __u32 w4; __u64 w8; switch (size) { case 1:Lines 1–500 of 899. Load more
/* * Kernel Debugger Architecture Independent Support Functions * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (c) 1999-2004 Silicon Graphics, Inc. All Rights Reserved. * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved. * 03/02/13 added new 2.5 kallsyms <xavier.bru@bull.net> */ #include <stdarg.h> #include <linux/types.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/kallsyms.h> #include <linux/stddef.h> #include <linux/vmalloc.h> #include <linux/ptrace.h> #include <linux/module.h> #include <linux/highmem.h> #include <linux/hardirq.h> #include <linux/delay.h> #include <linux/uaccess.h> #include <linux/kdb.h> #include <linux/slab.h> #include "kdb_private.h" /* * kdbgetsymval - Return the address of the given symbol. * * Parameters: * symname Character string containing symbol name * symtab Structure to receive results * Returns: * 0 Symbol not found, symtab zero filled * 1 Symbol mapped to module/symbol/section, data in symtab */ int kdbgetsymval(const char *symname, kdb_symtab_t *symtab) { kdb_dbg_printf(AR, "symname=%s, symtab=%px\n", symname, symtab); memset(symtab, 0, sizeof(*symtab)); symtab->sym_start = kallsyms_lookup_name(symname); if (symtab->sym_start) { kdb_dbg_printf(AR, "returns 1, symtab->sym_start=0x%lx\n", symtab->sym_start); return 1; } kdb_dbg_printf(AR, "returns 0\n"); return 0; } EXPORT_SYMBOL(kdbgetsymval); static char *kdb_name_table[100]; /* arbitrary size */ /* * kdbnearsym - Return the name of the symbol with the nearest address * less than 'addr'. * * Parameters: * addr Address to check for symbol near * symtab Structure to receive results * Returns: * 0 No sections contain this address, symtab zero filled * 1 Address mapped to module/symbol/section, data in symtab * Remarks: * 2.6 kallsyms has a "feature" where it unpacks the name into a * string. If that string is reused before the caller expects it * then the caller sees its string change without warning. To * avoid cluttering up the main kdb code with lots of kdb_strdup, * tests and kfree calls, kdbnearsym maintains an LRU list of the * last few unique strings. The list is sized large enough to * hold active strings, no kdb caller of kdbnearsym makes more * than ~20 later calls before using a saved value. */ int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab) { int ret = 0; unsigned long symbolsize = 0; unsigned long offset = 0; #define knt1_size 128 /* must be >= kallsyms table size */ char *knt1 = NULL; kdb_dbg_printf(AR, "addr=0x%lx, symtab=%px\n", addr, symtab); memset(symtab, 0, sizeof(*symtab)); if (addr < 4096) goto out; knt1 = debug_kmalloc(knt1_size, GFP_ATOMIC); if (!knt1) { kdb_func_printf("addr=0x%lx cannot kmalloc knt1\n", addr); goto out; } symtab->sym_name = kallsyms_lookup(addr, &symbolsize , &offset, (char **)(&symtab->mod_name), knt1); if (offset > 8*1024*1024) { symtab->sym_name = NULL; addr = offset = symbolsize = 0; } symtab->sym_start = addr - offset; symtab->sym_end = symtab->sym_start + symbolsize; ret = symtab->sym_name != NULL && *(symtab->sym_name) != '\0'; if (ret) { int i; /* Another 2.6 kallsyms "feature". Sometimes the sym_name is * set but the buffer passed into kallsyms_lookup is not used, * so it contains garbage. The caller has to work out which * buffer needs to be saved. * * What was Rusty smoking when he wrote that code? */ if (symtab->sym_name != knt1) { strncpy(knt1, symtab->sym_name, knt1_size); knt1[knt1_size-1] = '\0'; } for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) { if (kdb_name_table[i] && strcmp(kdb_name_table[i], knt1) == 0) break; } if (i >= ARRAY_SIZE(kdb_name_table)) { debug_kfree(kdb_name_table[0]); memmove(kdb_name_table, kdb_name_table+1, sizeof(kdb_name_table[0]) * (ARRAY_SIZE(kdb_name_table)-1)); } else { debug_kfree(knt1); knt1 = kdb_name_table[i]; memmove(kdb_name_table+i, kdb_name_table+i+1, sizeof(kdb_name_table[0]) * (ARRAY_SIZE(kdb_name_table)-i-1)); } i = ARRAY_SIZE(kdb_name_table) - 1; kdb_name_table[i] = knt1; symtab->sym_name = kdb_name_table[i]; knt1 = NULL; } if (symtab->mod_name == NULL) symtab->mod_name = "kernel"; kdb_dbg_printf(AR, "returns %d symtab->sym_start=0x%lx, symtab->mod_name=%px, symtab->sym_name=%px (%s)\n", ret, symtab->sym_start, symtab->mod_name, symtab->sym_name, symtab->sym_name); out: debug_kfree(knt1); return ret; } void kdbnearsym_cleanup(void) { int i; for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) { if (kdb_name_table[i]) { debug_kfree(kdb_name_table[i]); kdb_name_table[i] = NULL; } } } static char ks_namebuf[KSYM_NAME_LEN+1], ks_namebuf_prev[KSYM_NAME_LEN+1]; /* * kallsyms_symbol_complete * * Parameters: * prefix_name prefix of a symbol name to lookup * max_len maximum length that can be returned * Returns: * Number of symbols which match the given prefix. * Notes: * prefix_name is changed to contain the longest unique prefix that * starts with this prefix (tab completion). */ int kallsyms_symbol_complete(char *prefix_name, int max_len) { loff_t pos = 0; int prefix_len = strlen(prefix_name), prev_len = 0; int i, number = 0; const char *name; while ((name = kdb_walk_kallsyms(&pos))) { if (strncmp(name, prefix_name, prefix_len) == 0) { strscpy(ks_namebuf, name, sizeof(ks_namebuf)); /* Work out the longest name that matches the prefix */ if (++number == 1) { prev_len = min_t(int, max_len-1, strlen(ks_namebuf)); memcpy(ks_namebuf_prev, ks_namebuf, prev_len); ks_namebuf_prev[prev_len] = '\0'; continue; } for (i = 0; i < prev_len; i++) { if (ks_namebuf[i] != ks_namebuf_prev[i]) { prev_len = i; ks_namebuf_prev[i] = '\0'; break; } } } } if (prev_len > prefix_len) memcpy(prefix_name, ks_namebuf_prev, prev_len+1); return number; } /* * kallsyms_symbol_next * * Parameters: * prefix_name prefix of a symbol name to lookup * flag 0 means search from the head, 1 means continue search. * buf_size maximum length that can be written to prefix_name * buffer * Returns: * 1 if a symbol matches the given prefix. * 0 if no string found */ int kallsyms_symbol_next(char *prefix_name, int flag, int buf_size) { int prefix_len = strlen(prefix_name); static loff_t pos; const char *name; if (!flag) pos = 0; while ((name = kdb_walk_kallsyms(&pos))) { if (!strncmp(name, prefix_name, prefix_len)) return strscpy(prefix_name, name, buf_size); } return 0; } /* * kdb_symbol_print - Standard method for printing a symbol name and offset. * Inputs: * addr Address to be printed. * symtab Address of symbol data, if NULL this routine does its * own lookup. * punc Punctuation for string, bit field. * Remarks: * The string and its punctuation is only printed if the address * is inside the kernel, except that the value is always printed * when requested. */ void kdb_symbol_print(unsigned long addr, const kdb_symtab_t *symtab_p, unsigned int punc) { kdb_symtab_t symtab, *symtab_p2; if (symtab_p) { symtab_p2 = (kdb_symtab_t *)symtab_p; } else { symtab_p2 = &symtab; kdbnearsym(addr, symtab_p2); } if (!(symtab_p2->sym_name || (punc & KDB_SP_VALUE))) return; if (punc & KDB_SP_SPACEB) kdb_printf(" "); if (punc & KDB_SP_VALUE) kdb_printf(kdb_machreg_fmt0, addr); if (symtab_p2->sym_name) { if (punc & KDB_SP_VALUE) kdb_printf(" "); if (punc & KDB_SP_PAREN) kdb_printf("("); if (strcmp(symtab_p2->mod_name, "kernel")) kdb_printf("[%s]", symtab_p2->mod_name); kdb_printf("%s", symtab_p2->sym_name); if (addr != symtab_p2->sym_start) kdb_printf("+0x%lx", addr - symtab_p2->sym_start); if (punc & KDB_SP_SYMSIZE) kdb_printf("/0x%lx", symtab_p2->sym_end - symtab_p2->sym_start); if (punc & KDB_SP_PAREN) kdb_printf(")"); } if (punc & KDB_SP_SPACEA) kdb_printf(" "); if (punc & KDB_SP_NEWLINE) kdb_printf("\n"); } /* * kdb_strdup - kdb equivalent of strdup, for disasm code. * Inputs: * str The string to duplicate. * type Flags to kmalloc for the new string. * Returns: * Address of the new string, NULL if storage could not be allocated. * Remarks: * This is not in lib/string.c because it uses kmalloc which is not * available when string.o is used in boot loaders. */ char *kdb_strdup(const char *str, gfp_t type) { int n = strlen(str)+1; char *s = kmalloc(n, type); if (!s) return NULL; return strcpy(s, str); } /* * kdb_getarea_size - Read an area of data. The kdb equivalent of * copy_from_user, with kdb messages for invalid addresses. * Inputs: * res Pointer to the area to receive the result. * addr Address of the area to copy. * size Size of the area. * Returns: * 0 for success, < 0 for error. */ int kdb_getarea_size(void *res, unsigned long addr, size_t size) { int ret = copy_from_kernel_nofault((char *)res, (char *)addr, size); if (ret) { if (!KDB_STATE(SUPPRESS)) { kdb_func_printf("Bad address 0x%lx\n", addr); KDB_STATE_SET(SUPPRESS); } ret = KDB_BADADDR; } else { KDB_STATE_CLEAR(SUPPRESS); } return ret; } /* * kdb_putarea_size - Write an area of data. The kdb equivalent of * copy_to_user, with kdb messages for invalid addresses. * Inputs: * addr Address of the area to write to. * res Pointer to the area holding the data. * size Size of the area. * Returns: * 0 for success, < 0 for error. */ int kdb_putarea_size(unsigned long addr, void *res, size_t size) { int ret = copy_from_kernel_nofault((char *)addr, (char *)res, size); if (ret) { if (!KDB_STATE(SUPPRESS)) { kdb_func_printf("Bad address 0x%lx\n", addr); KDB_STATE_SET(SUPPRESS); } ret = KDB_BADADDR; } else { KDB_STATE_CLEAR(SUPPRESS); } return ret; } /* * kdb_getphys - Read data from a physical address. Validate the * address is in range, use kmap_atomic() to get data * similar to kdb_getarea() - but for phys addresses * Inputs: * res Pointer to the word to receive the result * addr Physical address of the area to copy * size Size of the area * Returns: * 0 for success, < 0 for error. */ static int kdb_getphys(void *res, unsigned long addr, size_t size) { unsigned long pfn; void *vaddr; struct page *page; pfn = (addr >> PAGE_SHIFT); if (!pfn_valid(pfn)) return 1; page = pfn_to_page(pfn); vaddr = kmap_atomic(page); memcpy(res, vaddr + (addr & (PAGE_SIZE - 1)), size); kunmap_atomic(vaddr); return 0; } /* * kdb_getphysword * Inputs: * word Pointer to the word to receive the result. * addr Address of the area to copy. * size Size of the area. * Returns: * 0 for success, < 0 for error. */ int kdb_getphysword(unsigned long *word, unsigned long addr, size_t size) { int diag; __u8 w1; __u16 w2; __u32 w4; __u64 w8; *word = 0; /* Default value if addr or size is invalid */ switch (size) { case 1: diag = kdb_getphys(&w1, addr, sizeof(w1)); if (!diag) *word = w1; break; case 2: diag = kdb_getphys(&w2, addr, sizeof(w2)); if (!diag) *word = w2; break; case 4: diag = kdb_getphys(&w4, addr, sizeof(w4)); if (!diag) *word = w4; break; case 8: if (size <= sizeof(*word)) { diag = kdb_getphys(&w8, addr, sizeof(w8)); if (!diag) *word = w8; break; } fallthrough; default: diag = KDB_BADWIDTH; kdb_func_printf("bad width %zu\n", size); } return diag; } /* * kdb_getword - Read a binary value. Unlike kdb_getarea, this treats * data as numbers. * Inputs: * word Pointer to the word to receive the result. * addr Address of the area to copy. * size Size of the area. * Returns: * 0 for success, < 0 for error. */ int kdb_getword(unsigned long *word, unsigned long addr, size_t size) { int diag; __u8 w1; __u16 w2; __u32 w4; __u64 w8; *word = 0; /* Default value if addr or size is invalid */ switch (size) { case 1: diag = kdb_getarea(w1, addr); if (!diag) *word = w1; break; case 2: diag = kdb_getarea(w2, addr); if (!diag) *word = w2; break; case 4: diag = kdb_getarea(w4, addr); if (!diag) *word = w4; break; case 8: if (size <= sizeof(*word)) { diag = kdb_getarea(w8, addr); if (!diag) *word = w8; break; } fallthrough; default: diag = KDB_BADWIDTH; kdb_func_printf("bad width %zu\n", size); } return diag; } /* * kdb_putword - Write a binary value. Unlike kdb_putarea, this * treats data as numbers. * Inputs: * addr Address of the area to write to.. * word The value to set. * size Size of the area. * Returns: * 0 for success, < 0 for error. */ int kdb_putword(unsigned long addr, unsigned long word, size_t size) { int diag; __u8 w1; __u16 w2; __u32 w4; __u64 w8; switch (size) { case 1: