diff options
Diffstat (limited to 'lib/vsprintf.c')
| -rw-r--r-- | lib/vsprintf.c | 133 |
1 files changed, 53 insertions, 80 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 23920c5ff728..a48aaa79d352 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -703,6 +703,22 @@ char *symbol_string(char *buf, char *end, void *ptr, #endif } +static const struct printf_spec default_str_spec = { + .field_width = -1, + .precision = -1, +}; + +static const struct printf_spec default_flag_spec = { + .base = 16, + .precision = -1, + .flags = SPECIAL | SMALL, +}; + +static const struct printf_spec default_dec_spec = { + .base = 10, + .precision = -1, +}; + static noinline_for_stack char *resource_string(char *buf, char *end, struct resource *res, struct printf_spec spec, const char *fmt) @@ -732,21 +748,11 @@ char *resource_string(char *buf, char *end, struct resource *res, .precision = -1, .flags = SMALL | ZEROPAD, }; - static const struct printf_spec dec_spec = { - .base = 10, - .precision = -1, - .flags = 0, - }; static const struct printf_spec str_spec = { .field_width = -1, .precision = 10, .flags = LEFT, }; - static const struct printf_spec flag_spec = { - .base = 16, - .precision = -1, - .flags = SPECIAL | SMALL, - }; /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ @@ -770,10 +776,10 @@ char *resource_string(char *buf, char *end, struct resource *res, specp = &mem_spec; } else if (res->flags & IORESOURCE_IRQ) { p = string(p, pend, "irq ", str_spec); - specp = &dec_spec; + specp = &default_dec_spec; } else if (res->flags & IORESOURCE_DMA) { p = string(p, pend, "dma ", str_spec); - specp = &dec_spec; + specp = &default_dec_spec; } else if (res->flags & IORESOURCE_BUS) { p = string(p, pend, "bus ", str_spec); specp = &bus_spec; @@ -803,7 +809,7 @@ char *resource_string(char *buf, char *end, struct resource *res, p = string(p, pend, " disabled", str_spec); } else { p = string(p, pend, " flags ", str_spec); - p = number(p, pend, res->flags, flag_spec); + p = number(p, pend, res->flags, default_flag_spec); } *p++ = ']'; *p = '\0'; @@ -913,9 +919,6 @@ char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, int cur, rbot, rtop; bool first = true; - /* reused to print numbers */ - spec = (struct printf_spec){ .base = 10 }; - rbot = cur = find_first_bit(bitmap, nr_bits); while (cur < nr_bits) { rtop = cur; @@ -930,13 +933,13 @@ char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, } first = false; - buf = number(buf, end, rbot, spec); + buf = number(buf, end, rbot, default_dec_spec); if (rbot < rtop) { if (buf < end) *buf = '-'; buf++; - buf = number(buf, end, rtop, spec); + buf = number(buf, end, rtop, default_dec_spec); } rbot = cur; @@ -1354,11 +1357,9 @@ char *uuid_string(char *buf, char *end, const u8 *addr, return string(buf, end, uuid, spec); } -int kptr_restrict __read_mostly; - static noinline_for_stack -char *restricted_pointer(char *buf, char *end, const void *ptr, - struct printf_spec spec) +char *pointer_string(char *buf, char *end, const void *ptr, + struct printf_spec spec) { spec.base = 16; spec.flags |= SMALL; @@ -1367,6 +1368,15 @@ char *restricted_pointer(char *buf, char *end, const void *ptr, spec.flags |= ZEROPAD; } + return number(buf, end, (unsigned long int)ptr, spec); +} + +int kptr_restrict __read_mostly; + +static noinline_for_stack +char *restricted_pointer(char *buf, char *end, const void *ptr, + struct printf_spec spec) +{ switch (kptr_restrict) { case 0: /* Always print %pK values */ @@ -1378,8 +1388,11 @@ char *restricted_pointer(char *buf, char *end, const void *ptr, * kptr_restrict==1 cannot be used in IRQ context * because its test for CAP_SYSLOG would be meaningless. */ - if (in_irq() || in_serving_softirq() || in_nmi()) + if (in_irq() || in_serving_softirq() || in_nmi()) { + if (spec.field_width == -1) + spec.field_width = 2 * sizeof(ptr); return string(buf, end, "pK-error", spec); + } /* * Only print the real pointer value if the current @@ -1404,7 +1417,7 @@ char *restricted_pointer(char *buf, char *end, const void *ptr, break; } - return number(buf, end, (unsigned long)ptr, spec); + return pointer_string(buf, end, ptr, spec); } static noinline_for_stack @@ -1456,9 +1469,6 @@ char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, return string(buf, end, NULL, spec); switch (fmt[1]) { - case 'r': - return number(buf, end, clk_get_rate(clk), spec); - case 'n': default: #ifdef CONFIG_COMMON_CLK @@ -1474,23 +1484,13 @@ char *format_flags(char *buf, char *end, unsigned long flags, const struct trace_print_flags *names) { unsigned long mask; - const struct printf_spec strspec = { - .field_width = -1, - .precision = -1, - }; - const struct printf_spec numspec = { - .flags = SPECIAL|SMALL, - .field_width = -1, - .precision = -1, - .base = 16, - }; for ( ; flags && names->name; names++) { mask = names->mask; if ((flags & mask) != mask) continue; - buf = string(buf, end, names->name, strspec); + buf = string(buf, end, names->name, default_str_spec); flags &= ~mask; if (flags) { @@ -1501,7 +1501,7 @@ char *format_flags(char *buf, char *end, unsigned long flags, } if (flags) - buf = number(buf, end, flags, numspec); + buf = number(buf, end, flags, default_flag_spec); return buf; } @@ -1548,22 +1548,18 @@ char *device_node_gen_full_name(const struct device_node *np, char *buf, char *e { int depth; const struct device_node *parent = np->parent; - static const struct printf_spec strspec = { - .field_width = -1, - .precision = -1, - }; /* special case for root node */ if (!parent) - return string(buf, end, "/", strspec); + return string(buf, end, "/", default_str_spec); for (depth = 0; parent->parent; depth++) parent = parent->parent; for ( ; depth >= 0; depth--) { - buf = string(buf, end, "/", strspec); + buf = string(buf, end, "/", default_str_spec); buf = string(buf, end, device_node_name_for_depth(np, depth), - strspec); + default_str_spec); } return buf; } @@ -1655,20 +1651,6 @@ char *device_node_string(char *buf, char *end, struct device_node *dn, return widen_string(buf, buf - buf_start, end, spec); } -static noinline_for_stack -char *pointer_string(char *buf, char *end, const void *ptr, - struct printf_spec spec) -{ - spec.base = 16; - spec.flags |= SMALL; - if (spec.field_width == -1) { - spec.field_width = 2 * sizeof(ptr); - spec.flags |= ZEROPAD; - } - - return number(buf, end, (unsigned long int)ptr, spec); -} - static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key); static siphash_key_t ptr_key __read_mostly; @@ -1710,13 +1692,13 @@ early_initcall(initialize_ptr_random); /* Maps a pointer to a 32 bit unique identifier. */ static char *ptr_to_id(char *buf, char *end, void *ptr, struct printf_spec spec) { + const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)"; unsigned long hashval; - const int default_width = 2 * sizeof(ptr); if (static_branch_unlikely(¬_filled_random_ptr_key)) { - spec.field_width = default_width; + spec.field_width = 2 * sizeof(ptr); /* string length must be less than default_width */ - return string(buf, end, "(ptrval)", spec); + return string(buf, end, str, spec); } #ifdef CONFIG_64BIT @@ -1729,15 +1711,7 @@ static char *ptr_to_id(char *buf, char *end, void *ptr, struct printf_spec spec) #else hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key); #endif - - spec.flags |= SMALL; - if (spec.field_width == -1) { - spec.field_width = default_width; - spec.flags |= ZEROPAD; - } - spec.base = 16; - - return number(buf, end, hashval, spec); + return pointer_string(buf, end, (const void *)hashval, spec); } /* @@ -1750,10 +1724,10 @@ static char *ptr_to_id(char *buf, char *end, void *ptr, struct printf_spec spec) * * Right now we handle: * - * - 'F' For symbolic function descriptor pointers with offset - * - 'f' For simple symbolic function names without offset - * - 'S' For symbolic direct pointers with offset - * - 's' For symbolic direct pointers without offset + * - 'S' For symbolic direct pointers (or function descriptors) with offset + * - 's' For symbolic direct pointers (or function descriptors) without offset + * - 'F' Same as 'S' + * - 'f' Same as 's' * - '[FfSs]R' as above with __builtin_extract_return_addr() translation * - 'B' For backtraced symbolic direct pointers with offset * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] @@ -1850,10 +1824,6 @@ static char *ptr_to_id(char *buf, char *end, void *ptr, struct printf_spec spec) * ** When making changes please also update: * Documentation/core-api/printk-formats.rst * - * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 - * function pointers are really function descriptors, which contain a - * pointer to the real address. - * * Note: The default behaviour (unadorned %p) is to hash the address, * rendering it useful as a unique identifier. */ @@ -2129,6 +2099,7 @@ qualifier: case 'x': spec->flags |= SMALL; + /* fall through */ case 'X': spec->base = 16; @@ -3087,8 +3058,10 @@ int vsscanf(const char *buf, const char *fmt, va_list args) break; case 'i': base = 0; + /* fall through */ case 'd': is_sign = true; + /* fall through */ case 'u': break; case '%': |