From cf9610f9116d55c5a66ef9f1faecacabd93a9322 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Mon, 24 Aug 2026 08:46:03 -0700 Subject: Merge tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl Pull pin control updates from Linus Walleij: "Core changes: - Use the non-blocking mux_state_try_select() in the generic MUX pin control back-end - Free pin maps on pinctrl_generic_to_map() failure in the core helpers New hardware pin control: - Qualcomm Maili TLMM SoC, PMG1110 PMIC, and Eliza LPASS LPI TLMM SoC (this is for the low power audio, LPASS = Low Power Audio SubSystem portions) - Upboard support on top of the Intel pin controller - Apple T6030 and T6031 support (just compatible strings) - Samsung Exynos 8855 SoC - Mediatek MT6858 SoC - Rockchip RK3308B and RV1106 SoCs - Airoha EN7523 and AN7563 SoCs Improvements: - Qualcomm TLMM GPIOs are unconditionally marked as wakeup capable - Qualcomm improvements on top of the Qualcomm PDC (power domain controller) irqchip improvements from tglx:s tree - Qualcomm IPQ806x and IPQ9650 non-urgent pin grop fixups - The NPCM8xx driver has been put into shape fixing many pin and group definitions - Some non-urgent Tegra 264 pin assignments are fixed up - Some non-urgent fixups to Airoha AN7581 and AN7583 registers and pin assignments, missing features etc" * tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (130 commits) dt-bindings: pinctrl: Convert TI DA850 pupd to DT schema pinctrl: meson: sync some modify from A4 pinctrl: meson: a4: Add input enable pin configuration pinctrl: realtek: rtd1625: remove unused group name spdif_sel pinctrl: realtek: rtd1625: fix base_bit for VE4 GPIO 13 dt-bindings: pinctrl: microchip,pic32mzda-pinctrl: Convert to DT schema Revert "Merge branch 'ib-rsk7204' into devel" pinctrl: rockchip: Add RV1106 pinctrl support dt-bindings: pinctrl: rockchip: Add RV1106 compatible pinctrl: rockchip: Decode drive strength in the get function pinctrl: fix PINCTRL_GENERIC_MUX not always being selectable pinctrl: airoha: add support of an7563 SoC dt-bindings: pinctrl: airoha: add support of an7563 pin controller pinctrl: airoha: try to find chip scu node by phandle first pinctrl: airoha: add support of en7523 SoC dt-bindings: pinctrl: airoha: add support of en7523 pin controller pinctrl: airoha: an7583: add support for olt pinmux pinctrl: airoha: an7583: add support for pon_alt pinmux pinctrl: airoha: an7583: add support for npu_uart pinmux dt-bindings: pinctrl: airoha: an7583: add missed features ... --- tools/objtool/signal.c | 135 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 135 insertions(+) create mode 100644 tools/objtool/signal.c (limited to 'tools/objtool/signal.c') diff --git a/tools/objtool/signal.c b/tools/objtool/signal.c new file mode 100644 index 000000000..af5c65c0f --- /dev/null +++ b/tools/objtool/signal.c @@ -0,0 +1,135 @@ +/* + * signal.c: Register a sigaltstack for objtool, to be able to + * run a signal handler on a separate stack even if + * the main process stack has overflown. Print out + * stack overflow errors when this happens. + */ +#include +#include +#include +#include +#include +#include + +#include +#include + +static unsigned long stack_limit; + +static bool is_stack_overflow(void *fault_addr) +{ + unsigned long fault = (unsigned long)fault_addr; + + /* Check if fault is in the guard page just below the limit. */ + return fault < stack_limit && fault >= stack_limit - 4096; +} + +static void signal_handler(int sig_num, siginfo_t *info, void *context) +{ + struct sigaction sa_dfl = {0}; + const char *sig_name; + char msg[256]; + int msg_len; + + switch (sig_num) { + case SIGSEGV: sig_name = "SIGSEGV"; break; + case SIGBUS: sig_name = "SIGBUS"; break; + case SIGILL: sig_name = "SIGILL"; break; + case SIGABRT: sig_name = "SIGABRT"; break; + default: sig_name = "Unknown signal"; break; + } + + if (is_stack_overflow(info->si_addr)) { + msg_len = snprintf(msg, sizeof(msg), + "%s: error: %s: objtool stack overflow!\n", + objname, sig_name); + } else { + msg_len = snprintf(msg, sizeof(msg), + "%s: error: %s: objtool crash!\n", + objname, sig_name); + } + + msg_len = write(STDERR_FILENO, msg, msg_len); + + /* Re-raise the signal to trigger the core dump */ + sa_dfl.sa_handler = SIG_DFL; + sigaction(sig_num, &sa_dfl, NULL); + raise(sig_num); +} + +static int read_stack_limit(void) +{ + unsigned long stack_start, stack_end; + struct rlimit rlim; + char line[256]; + int ret = 0; + FILE *fp; + + if (getrlimit(RLIMIT_STACK, &rlim)) { + ERROR_GLIBC("getrlimit"); + return -1; + } + + fp = fopen("/proc/self/maps", "r"); + if (!fp) { + ERROR_GLIBC("fopen"); + return -1; + } + + while (fgets(line, sizeof(line), fp)) { + if (strstr(line, "[stack]")) { + if (sscanf(line, "%lx-%lx", &stack_start, &stack_end) != 2) { + ERROR_GLIBC("sscanf"); + ret = -1; + goto done; + } + stack_limit = stack_end - rlim.rlim_cur; + goto done; + } + } + + ret = -1; + ERROR("/proc/self/maps: can't find [stack]"); + +done: + fclose(fp); + + return ret; +} + +int init_signal_handler(void) +{ + int signals[] = {SIGSEGV, SIGBUS, SIGILL, SIGABRT}; + struct sigaction sa; + stack_t ss; + + if (read_stack_limit()) + return -1; + + ss.ss_sp = malloc(SIGSTKSZ); + if (!ss.ss_sp) { + ERROR_GLIBC("malloc"); + return -1; + } + ss.ss_size = SIGSTKSZ; + ss.ss_flags = 0; + + if (sigaltstack(&ss, NULL) == -1) { + ERROR_GLIBC("sigaltstack"); + return -1; + } + + sa.sa_sigaction = signal_handler; + sigemptyset(&sa.sa_mask); + + sa.sa_flags = SA_ONSTACK | SA_SIGINFO; + + for (int i = 0; i < ARRAY_SIZE(signals); i++) { + if (sigaction(signals[i], &sa, NULL) == -1) { + ERROR_GLIBC("sigaction"); + return -1; + } + } + + return 0; +} -- cgit v1.3.1