bb9d812643
The Tile architecture port was added by Chris Metcalf in 2010, and maintained until early 2018 when he orphaned it due to his departure from Mellanox, and nobody else stepped up to maintain it. The product line is still around in the form of the BlueField SoC, but no longer uses the Tile architecture. There are also still products for sale with Tile-GX SoCs, notably the Mikrotik CCR router family. The products all use old (linux-3.3) kernels with lots of patches and won't be upgraded by their manufacturers. There have been efforts to port both OpenWRT and Debian to these, but both projects have stalled and are very unlikely to be continued in the future. Given that we are reasonably sure that nobody is still using the port with an upstream kernel any more, it seems better to remove it now while the port is in a good shape than to let it bitrot for a few years first. Cc: Chris Metcalf <chris.d.metcalf@gmail.com> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Link: http://www.mellanox.com/page/npu_multicore_overview Link: https://jenkins.debian.net/view/rebootstrap/job/rebootstrap_tilegx_gcc7/ Signed-off-by: Arnd Bergmann <arnd@arndb.de>
118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/*
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* NOTE: This example is works on x86 and powerpc.
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* Here's a sample kernel module showing the use of kprobes to dump a
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* stack trace and selected registers when _do_fork() is called.
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*
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* For more information on theory of operation of kprobes, see
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* Documentation/kprobes.txt
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*
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* You will see the trace data in /var/log/messages and on the console
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* whenever _do_fork() is invoked to create a new process.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/kprobes.h>
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#define MAX_SYMBOL_LEN 64
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static char symbol[MAX_SYMBOL_LEN] = "_do_fork";
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module_param_string(symbol, symbol, sizeof(symbol), 0644);
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/* For each probe you need to allocate a kprobe structure */
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static struct kprobe kp = {
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.symbol_name = symbol,
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};
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/* kprobe pre_handler: called just before the probed instruction is executed */
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static int handler_pre(struct kprobe *p, struct pt_regs *regs)
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{
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#ifdef CONFIG_X86
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pr_info("<%s> pre_handler: p->addr = 0x%p, ip = %lx, flags = 0x%lx\n",
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p->symbol_name, p->addr, regs->ip, regs->flags);
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#endif
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#ifdef CONFIG_PPC
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pr_info("<%s> pre_handler: p->addr = 0x%p, nip = 0x%lx, msr = 0x%lx\n",
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p->symbol_name, p->addr, regs->nip, regs->msr);
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#endif
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#ifdef CONFIG_MIPS
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pr_info("<%s> pre_handler: p->addr = 0x%p, epc = 0x%lx, status = 0x%lx\n",
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p->symbol_name, p->addr, regs->cp0_epc, regs->cp0_status);
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#endif
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#ifdef CONFIG_ARM64
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pr_info("<%s> pre_handler: p->addr = 0x%p, pc = 0x%lx,"
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" pstate = 0x%lx\n",
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p->symbol_name, p->addr, (long)regs->pc, (long)regs->pstate);
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#endif
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#ifdef CONFIG_S390
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pr_info("<%s> pre_handler: p->addr, 0x%p, ip = 0x%lx, flags = 0x%lx\n",
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p->symbol_name, p->addr, regs->psw.addr, regs->flags);
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#endif
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/* A dump_stack() here will give a stack backtrace */
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return 0;
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}
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/* kprobe post_handler: called after the probed instruction is executed */
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static void handler_post(struct kprobe *p, struct pt_regs *regs,
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unsigned long flags)
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{
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#ifdef CONFIG_X86
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pr_info("<%s> post_handler: p->addr = 0x%p, flags = 0x%lx\n",
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p->symbol_name, p->addr, regs->flags);
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#endif
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#ifdef CONFIG_PPC
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pr_info("<%s> post_handler: p->addr = 0x%p, msr = 0x%lx\n",
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p->symbol_name, p->addr, regs->msr);
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#endif
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#ifdef CONFIG_MIPS
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pr_info("<%s> post_handler: p->addr = 0x%p, status = 0x%lx\n",
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p->symbol_name, p->addr, regs->cp0_status);
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#endif
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#ifdef CONFIG_ARM64
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pr_info("<%s> post_handler: p->addr = 0x%p, pstate = 0x%lx\n",
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p->symbol_name, p->addr, (long)regs->pstate);
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#endif
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#ifdef CONFIG_S390
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pr_info("<%s> pre_handler: p->addr, 0x%p, flags = 0x%lx\n",
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p->symbol_name, p->addr, regs->flags);
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#endif
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}
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/*
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* fault_handler: this is called if an exception is generated for any
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* instruction within the pre- or post-handler, or when Kprobes
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* single-steps the probed instruction.
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*/
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static int handler_fault(struct kprobe *p, struct pt_regs *regs, int trapnr)
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{
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pr_info("fault_handler: p->addr = 0x%p, trap #%dn", p->addr, trapnr);
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/* Return 0 because we don't handle the fault. */
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return 0;
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}
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static int __init kprobe_init(void)
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{
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int ret;
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kp.pre_handler = handler_pre;
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kp.post_handler = handler_post;
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kp.fault_handler = handler_fault;
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ret = register_kprobe(&kp);
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if (ret < 0) {
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pr_err("register_kprobe failed, returned %d\n", ret);
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return ret;
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}
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pr_info("Planted kprobe at %p\n", kp.addr);
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return 0;
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}
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static void __exit kprobe_exit(void)
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{
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unregister_kprobe(&kp);
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pr_info("kprobe at %p unregistered\n", kp.addr);
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}
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module_init(kprobe_init)
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module_exit(kprobe_exit)
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MODULE_LICENSE("GPL");
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