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authorPeter Maydell <peter.maydell@linaro.org>2020-02-28 15:36:06 +0000
committerPeter Maydell <peter.maydell@linaro.org>2020-03-06 10:05:12 +0000
commita6b30bcae6ebc71bae83e0ac7a5f0dfc93bb5b3e (patch)
tree5c6a0494b9cc31d084e5f203b7157cfd38d844d7 /disas/nanomips.cpp
parent324b2298feab35533d44301cfdae332c086463cf (diff)
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hmp-commands.hx: Add rST documentation fragments
Add the rST versions of the documentation fragments. Once we've converted fully from Texinfo to rST we can remove the ETEXI fragments; for the moment we need both. Since the only consumer of the hmp-commands hxtool documentation is the HTML manual, all we need to do for the monitor command documentation to appear in the Sphinx system manual is add the one line that invokes the hxtool extension on the .hx file. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Tested-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20200228153619.9906-21-peter.maydell@linaro.org
Diffstat (limited to 'disas/nanomips.cpp')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.1 at 2025-08-29 01:55:32 +0000
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/* ELF Boot loader
 * As we have seek, this implementation can be straightforward.
 * 2003-07 by SONE Takeshi
 */

#include "config.h"
#include "kernel/kernel.h"
#include "libc/diskio.h"
#include "arch/common/elf_boot.h"
#include "libopenbios/elf_load.h"
#include "libopenbios/sys_info.h"
#include "libopenbios/ipchecksum.h"
#include "libopenbios/bindings.h"
#include "libopenbios/initprogram.h"
#include "libopenbios/ofmem.h"
#define printf printk
#define debug printk

#define DEBUG		0

#define MAX_HEADERS	0x20
#define BS		0x100	/* smallest step used when looking for the ELF header */

#ifdef CONFIG_PPC
extern void             flush_icache_range( char *start, char *stop );
#endif

/* FreeBSD and possibly others mask the high 8 bits */
#define addr_fixup(addr) ((addr) & 0x00ffffff)

static char *image_name, *image_version;
static int fd;

/* Note: avoid name collision with platforms which have their own version of calloc() */
static void *ob_calloc(size_t nmemb, size_t size)
{
    size_t alloc_size = nmemb * size;
    void *mem;

    if (alloc_size < nmemb || alloc_size < size) {
        printf("calloc overflow: %u, %u\n", nmemb, size);
        return NULL;
    }

    mem = malloc(alloc_size);
    memset(mem, 0, alloc_size);

    return mem;
}

static int check_mem_ranges(struct sys_info *info,
	Elf_phdr *phdr, int phnum)
{
    int i, j;
    unsigned long start, end;
    unsigned long prog_start, prog_end;
    struct memrange *mem;

    prog_start = virt_to_phys(&_start);
    prog_end = virt_to_phys(&_end);

    for (i = 0; i < phnum; i++) {
	if (phdr[i].p_type != PT_LOAD)
	    continue;
	start = addr_fixup(phdr[i].p_paddr);
	end = start + phdr[i].p_memsz;
	if (start < prog_start && end > prog_start)
	    goto conflict;
	if (start < prog_end && end > prog_end)
	    goto conflict;
	mem=info->memrange;
	for (j = 0; j < info->n_memranges; j++) {
	    if (mem[j].base <= start && mem[j].base + mem[j].size >= end)
		break;
	}
	if (j >= info->n_memranges)
	    goto badseg;
    }
    return 1;

conflict:
    printf("%s occupies [%#lx-%#lx]\n", program_name, prog_start, prog_end);

badseg:
    printf("Segment %d [%#lx-%#lx] doesn't fit into memory\n", i, start, end-1);
    return 0;
}

static unsigned long process_image_notes(Elf_phdr *phdr, int phnum,
                                         unsigned short *sum_ptr,
                                         unsigned int offset)
{
    int i;
    char *buf = NULL;
    int retval = 0;
    unsigned long addr, end;
    Elf_Nhdr *nhdr;
    const char *name;
    void *desc;

    for (i = 0; i < phnum; i++) {
	if (phdr[i].p_type != PT_NOTE)
	    continue;
	buf = malloc(phdr[i].p_filesz);
	seek_io(fd, offset + phdr[i].p_offset);
	if ((size_t)read_io(fd, buf, phdr[i].p_filesz) != phdr[i].p_filesz) {
	    printf("Can't read note segment\n");
	    goto out;
	}
	addr = (unsigned long) buf;
	end = addr + phdr[i].p_filesz;
	while (addr < end) {
	    nhdr = (Elf_Nhdr *) addr;
	    addr += sizeof(Elf_Nhdr);
	    name = (const char *) addr;
	    addr += (nhdr->n_namesz+3) & ~3;
	    desc = (void *) addr;
	    addr += (nhdr->n_descsz+3) & ~3;

	    if (nhdr->n_namesz==sizeof(ELF_NOTE_BOOT)
		    && memcmp(name, ELF_NOTE_BOOT, sizeof(ELF_NOTE_BOOT))==0) {
		if (nhdr->n_type == EIN_PROGRAM_NAME) {
		    image_name = ob_calloc(1, nhdr->n_descsz + 1);
		    memcpy(image_name, desc, nhdr->n_descsz);
		}
		if (nhdr->n_type == EIN_PROGRAM_VERSION) {
		    image_version = ob_calloc(1, nhdr->n_descsz + 1);
		    memcpy(image_version, desc, nhdr->n_descsz);
		}
		if (nhdr->n_type == EIN_PROGRAM_CHECKSUM) {
		    *sum_ptr = *(unsigned short *) desc;
		    debug("Image checksum: %#04x\n", *sum_ptr);
		    /* Where in the file */
		    retval = phdr[i].p_offset
			+ (unsigned long) desc - (unsigned long) buf;
		}
	    }
	}
    }
out:
    close_io(fd);
    if (buf)
	free(buf);
    return retval;
}

static int load_segments(Elf_phdr *phdr, int phnum,
                         unsigned long checksum_offset,
                         unsigned int offset, unsigned long *bytes)
{
    //unsigned int start_time, time;
    int i;

    *bytes = 0;
    // start_time = currticks();
    for (i = 0; i < phnum; i++) {
	if (phdr[i].p_type != PT_LOAD)
	    continue;
	debug("segment %d addr:" FMT_elf " file:" FMT_elf " mem:" FMT_elf " ",
              i, addr_fixup(phdr[i].p_paddr), phdr[i].p_filesz, phdr[i].p_memsz);
	seek_io(fd, offset + phdr[i].p_offset);
	debug("loading... ");
	if ((size_t)read_io(fd, phys_to_virt(addr_fixup(phdr[i].p_paddr)), phdr[i].p_filesz)
		!= phdr[i].p_filesz) {
	    printf("Can't read program segment %d\n", i);
	    return 0;
	}
	bytes += phdr[i].p_filesz;
	debug("clearing... ");
	memset(phys_to_virt(addr_fixup(phdr[i].p_paddr) + phdr[i].p_filesz), 0,
		phdr[i].p_memsz - phdr[i].p_filesz);
	if (phdr[i].p_offset <= checksum_offset
		&& phdr[i].p_offset + phdr[i].p_filesz >= checksum_offset+2) {
	    debug("clearing checksum... ");
	    memset(phys_to_virt(addr_fixup(phdr[i].p_paddr) + checksum_offset
			- phdr[i].p_offset), 0, 2);
	}
	debug("ok\n");

    }
    // time = currticks() - start_time;
    //debug("Loaded %lu bytes in %ums (%luKB/s)\n", bytes, time,
    //	    time? bytes/time : 0);
    debug("Loaded %lu bytes \n", *bytes);

    return 1;
}

static int verify_image(Elf_ehdr *ehdr, Elf_phdr *phdr, int phnum,
	unsigned short image_sum)
{
    unsigned short sum, part_sum;
    unsigned long offset;
    int i;

    sum = 0;
    offset = 0;

    part_sum = ipchksum(ehdr, sizeof *ehdr);
    sum = add_ipchksums(offset, sum, part_sum);
    offset += sizeof *ehdr;

    part_sum = ipchksum(phdr, phnum * sizeof(*phdr));
    sum = add_ipchksums(offset, sum, part_sum);
    offset += phnum * sizeof(*phdr);

    for (i = 0; i < phnum; i++) {
	if (phdr[i].p_type != PT_LOAD)
	    continue;
	part_sum = ipchksum(phys_to_virt(addr_fixup(phdr[i].p_paddr)), phdr[i].p_memsz);
	sum = add_ipchksums(offset, sum, part_sum);
	offset += phdr[i].p_memsz;
    }

    if (sum != image_sum) {
	printf("Verify FAILED (image:%#04x vs computed:%#04x)\n",
		image_sum, sum);
	return 0;
    }
    return 1;
}

static inline unsigned padded(unsigned s)
{
    return (s + 3) & ~3;
}

static Elf_Bhdr *add_boot_note(Elf_Bhdr *bhdr, const char *name,
	unsigned type, const char *desc, unsigned descsz)
{
    Elf_Nhdr nhdr;
    unsigned ent_size, new_size, pad;
    char *addr;

    if (!bhdr)
	return NULL;

    nhdr.n_namesz = name? strlen(name)+1 : 0;
    nhdr.n_descsz = descsz;
    nhdr.n_type = type;
    ent_size = sizeof(nhdr) + padded(nhdr.n_namesz) + padded(nhdr.n_descsz);