^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Load ELF vmlinux file for the kexec_file_load syscall.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2004 Adam Litke (agl@us.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2004 IBM Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2005 R Sharada (sharada@in.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2006 Mohan Kumar M (mohan@in.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 2016 IBM Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Based on kexec-tools' kexec-elf-exec.c and kexec-elf-ppc64.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Heavily modified for the kernel by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define pr_fmt(fmt) "kexec_elf: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/elf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/kexec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/libfdt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/of_fdt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static void *elf64_load(struct kimage *image, char *kernel_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) unsigned long kernel_len, char *initrd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) unsigned long initrd_len, char *cmdline,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) unsigned long cmdline_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) unsigned int fdt_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) unsigned long kernel_load_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) unsigned long initrd_load_addr = 0, fdt_load_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) void *fdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) const void *slave_code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct elfhdr ehdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) char *modified_cmdline = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct kexec_elf_info elf_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct kexec_buf kbuf = { .image = image, .buf_min = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) .buf_max = ppc64_rma_size };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct kexec_buf pbuf = { .image = image, .buf_min = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) .buf_max = ppc64_rma_size, .top_down = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) .mem = KEXEC_BUF_MEM_UNKNOWN };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) ret = kexec_build_elf_info(kernel_buf, kernel_len, &ehdr, &elf_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (image->type == KEXEC_TYPE_CRASH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* min & max buffer values for kdump case */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) kbuf.buf_min = pbuf.buf_min = crashk_res.start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) kbuf.buf_max = pbuf.buf_max =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) ((crashk_res.end < ppc64_rma_size) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) crashk_res.end : (ppc64_rma_size - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) ret = kexec_elf_load(image, &ehdr, &elf_info, &kbuf, &kernel_load_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) pr_debug("Loaded the kernel at 0x%lx\n", kernel_load_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) ret = kexec_load_purgatory(image, &pbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) pr_err("Loading purgatory failed.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) pr_debug("Loaded purgatory at 0x%lx\n", pbuf.mem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /* Load additional segments needed for panic kernel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (image->type == KEXEC_TYPE_CRASH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) ret = load_crashdump_segments_ppc64(image, &kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) pr_err("Failed to load kdump kernel segments\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /* Setup cmdline for kdump kernel case */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) modified_cmdline = setup_kdump_cmdline(image, cmdline,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) cmdline_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (!modified_cmdline) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) pr_err("Setting up cmdline for kdump kernel failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) cmdline = modified_cmdline;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (initrd != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) kbuf.buffer = initrd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) kbuf.bufsz = kbuf.memsz = initrd_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) kbuf.buf_align = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) kbuf.top_down = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) ret = kexec_add_buffer(&kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) initrd_load_addr = kbuf.mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) pr_debug("Loaded initrd at 0x%lx\n", initrd_load_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) fdt_size = kexec_fdt_totalsize_ppc64(image);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) fdt = kmalloc(fdt_size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (!fdt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) pr_err("Not enough memory for the device tree.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) pr_err("Error setting up the new device tree.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) initrd_len, cmdline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) fdt_pack(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) kbuf.buffer = fdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) kbuf.bufsz = kbuf.memsz = fdt_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) kbuf.buf_align = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) kbuf.top_down = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) ret = kexec_add_buffer(&kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) fdt_load_addr = kbuf.mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) slave_code = elf_info.buffer + elf_info.proghdrs[0].p_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ret = setup_purgatory_ppc64(image, slave_code, fdt, kernel_load_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) fdt_load_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) pr_err("Error setting up the purgatory.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) kfree(modified_cmdline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) kexec_free_elf_info(&elf_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* Make kimage_file_post_load_cleanup free the fdt buffer for us. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return ret ? ERR_PTR(ret) : fdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) const struct kexec_file_ops kexec_elf64_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) .probe = kexec_elf_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) .load = elf64_load,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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