/* * syscall_arg_fault.c - tests faults 32-bit fast syscall stack args * Copyright (c) 2015 Andrew Lutomirski * * This program is free software; you can redistribute it and/or modify * it under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #define _GNU_SOURCE #include #include #include #include #include #include #include #include /* Our sigaltstack scratch space. */ static unsigned char altstack_data[SIGSTKSZ]; static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *), int flags) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_sigaction = handler; sa.sa_flags = SA_SIGINFO | flags; sigemptyset(&sa.sa_mask); if (sigaction(sig, &sa, 0)) err(1, "sigaction"); } static volatile sig_atomic_t sig_traps; static sigjmp_buf jmpbuf; static volatile sig_atomic_t n_errs; static void sigsegv(int sig, siginfo_t *info, void *ctx_void) { ucontext_t *ctx = (ucontext_t*)ctx_void; if (ctx->uc_mcontext.gregs[REG_EAX] != -EFAULT) { printf("[FAIL]\tAX had the wrong value: 0x%x\n", ctx->uc_mcontext.gregs[REG_EAX]); n_errs++; } else { printf("[OK]\tSeems okay\n"); } siglongjmp(jmpbuf, 1); } static void sigill(int sig, siginfo_t *info, void *ctx_void) { printf("[SKIP]\tIllegal instruction\n"); siglongjmp(jmpbuf, 1); } int main() { stack_t stack = { .ss_sp = altstack_data, .ss_size = SIGSTKSZ, }; if (sigaltstack(&stack, NULL) != 0) err(1, "sigaltstack"); sethandler(SIGSEGV, sigsegv, SA_ONSTACK); sethandler(SIGILL, sigill, SA_ONSTACK); /* * Exercise another nasty special case. The 32-bit SYSCALL * and SYSENTER instructions (even in compat mode) each * clobber one register. A Linux system call has a syscall * number and six arguments, and the user stack pointer * needs to live in some register on return. That means * that we need eight registers, but SYSCALL and SYSENTER * only preserve seven registers. As a result, one argument * ends up on the stack. The stack is user memory, which * means that the kernel can fail to read it. * * The 32-bit fast system calls don't have a defined ABI: * we're supposed to invoke them through the vDSO. So we'll * fudge it: we set all regs to invalid pointer values and * invoke the entry instruction. The return will fail no * matter what, and we completely lose our program state, * but we can fix it up with a signal handler. */ printf("[RUN]\tSYSENTER with invalid state\n"); if (sigsetjmp(jmpbuf, 1) == 0) { asm volatile ( "movl $-1, %%eax\n\t" "movl $-1, %%ebx\n\t" "movl $-1, %%ecx\n\t" "movl $-1, %%edx\n\t" "movl $-1, %%esi\n\t" "movl $-1, %%edi\n\t" "movl $-1, %%ebp\n\t" "movl $-1, %%esp\n\t" "sysenter" : : : "memory", "flags"); } printf("[RUN]\tSYSCALL with invalid state\n"); if (sigsetjmp(jmpbuf, 1) == 0) { asm volatile ( "movl $-1, %%eax\n\t" "movl $-1, %%ebx\n\t" "movl $-1, %%ecx\n\t" "movl $-1, %%edx\n\t" "movl $-1, %%esi\n\t" "movl $-1, %%edi\n\t" "movl $-1, %%ebp\n\t" "movl $-1, %%esp\n\t" "syscall\n\t" "pushl $0" /* make sure we segfault cleanly */ : : : "memory", "flags"); } return 0; } ' value='d8ca5bd158f738c4fa6974ee388c381f64db7905'/>
context:
space:
mode:
authorAndrew F. Davis <afd@ti.com>2016-12-01 10:44:16 -0600
committerMark Brown <broonie@kernel.org>2016-12-01 17:42:27 +0000
commitd8ca5bd158f738c4fa6974ee388c381f64db7905 (patch)
tree2657a344b39f62f92943b5070173e25d27d12ab4 /tools/vm/slabinfo.c
parent1001354ca34179f3db924eb66672442a173147dc (diff)
regulator: tps65086: Fix 25mV ranges for BUCK regulators
The BUCK regulators 3, 4, and 5 also have a 10mV step mode, adjust the tables and logic to reflect the data-sheet for these regulators. fixes: d2a2e729a666 ("regulator: tps65086: Add regulator driver for the TPS65086 PMIC") Signed-off-by: Andrew F. Davis <afd@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'tools/vm/slabinfo.c')