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-rw-r--r--tools/libxc/xc_vmx_build.c802
1 files changed, 802 insertions, 0 deletions
diff --git a/tools/libxc/xc_vmx_build.c b/tools/libxc/xc_vmx_build.c
new file mode 100644
index 0000000000..aaae52f0c5
--- /dev/null
+++ b/tools/libxc/xc_vmx_build.c
@@ -0,0 +1,802 @@
+/******************************************************************************
+ * xc_vmx_build.c
+ */
+
+#include "xc_private.h"
+#define ELFSIZE 32
+#include "xc_elf.h"
+#include <stdlib.h>
+#include <zlib.h>
+#include "linux_boot_params.h"
+
+#define L1_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED)
+#define L2_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY|_PAGE_USER)
+
+#define round_pgup(_p) (((_p)+(PAGE_SIZE-1))&PAGE_MASK)
+#define round_pgdown(_p) ((_p)&PAGE_MASK)
+
+#define LINUX_BOOT_PARAMS_ADDR 0x00090000
+#define LINUX_KERNEL_ENTR_ADDR 0x00100000
+#define LINUX_PAGE_OFFSET 0xC0000000
+
+struct domain_setup_info
+{
+ unsigned long v_start;
+ unsigned long v_end;
+ unsigned long v_kernstart;
+ unsigned long v_kernend;
+ unsigned long v_kernentry;
+
+ unsigned int use_writable_pagetables;
+ unsigned int load_bsd_symtab;
+
+ unsigned long symtab_addr;
+ unsigned long symtab_len;
+};
+
+static int
+parseelfimage(
+ char *elfbase, unsigned long elfsize, struct domain_setup_info *dsi);
+static int
+loadelfimage(
+ char *elfbase, int xch, u32 dom, unsigned long *parray,
+ unsigned long vstart);
+static int
+loadelfsymtab(
+ char *elfbase, int xch, u32 dom, unsigned long *parray,
+ struct domain_setup_info *dsi);
+
+static void build_e820map(struct mem_map *mem_mapp, unsigned long mem_size)
+{
+ int nr_map = 0;
+
+ /* XXX: Doesn't work for > 4GB yet */
+ mem_mapp->map[0].addr = 0x0;
+ mem_mapp->map[0].size = 0x9F800;
+ mem_mapp->map[0].type = E820_RAM;
+ mem_mapp->map[0].caching_attr = MEMMAP_WB;
+ nr_map++;
+
+ mem_mapp->map[1].addr = 0x9F800;
+ mem_mapp->map[1].size = 0x800;
+ mem_mapp->map[1].type = E820_RESERVED;
+ mem_mapp->map[1].caching_attr = MEMMAP_UC;
+ nr_map++;
+
+ mem_mapp->map[2].addr = 0xA0000;
+ mem_mapp->map[2].size = 0x20000;
+ mem_mapp->map[2].type = E820_IO;
+ mem_mapp->map[2].caching_attr = MEMMAP_UC;
+ nr_map++;
+
+ mem_mapp->map[3].addr = 0xF0000;
+ mem_mapp->map[3].size = 0x10000;
+ mem_mapp->map[3].type = E820_RESERVED;
+ mem_mapp->map[3].caching_attr = MEMMAP_UC;
+ nr_map++;
+
+ mem_mapp->map[4].addr = 0x100000;
+ mem_mapp->map[4].size = mem_size - 0x100000 - PAGE_SIZE;
+ mem_mapp->map[4].type = E820_RAM;
+ mem_mapp->map[4].caching_attr = MEMMAP_WB;
+ nr_map++;
+
+ mem_mapp->map[5].addr = mem_size - PAGE_SIZE;
+ mem_mapp->map[5].size = PAGE_SIZE;
+ mem_mapp->map[5].type = E820_SHARED;
+ mem_mapp->map[5].caching_attr = MEMMAP_WB;
+ nr_map++;
+
+ mem_mapp->map[6].addr = mem_size;
+ mem_mapp->map[6].size = 0x3 * PAGE_SIZE;
+ mem_mapp->map[6].type = E820_NVS;
+ mem_mapp->map[6].caching_attr = MEMMAP_UC;
+ nr_map++;
+
+ mem_mapp->map[7].addr = mem_size + 0x3 * PAGE_SIZE;
+ mem_mapp->map[7].size = 0xA * PAGE_SIZE;
+ mem_mapp->map[7].type = E820_ACPI;
+ mem_mapp->map[7].caching_attr = MEMMAP_WB;
+ nr_map++;
+
+ mem_mapp->map[8].addr = 0xFEC00000;
+ mem_mapp->map[8].size = 0x1400000;
+ mem_mapp->map[8].type = E820_IO;
+ mem_mapp->map[8].caching_attr = MEMMAP_UC;
+ nr_map++;
+
+ mem_mapp->nr_map = nr_map;
+}
+
+static int setup_guestos(int xc_handle,
+ u32 dom, int memsize,
+ char *image, unsigned long image_size,
+ gzFile initrd_gfd, unsigned long initrd_len,
+ unsigned long nr_pages,
+ full_execution_context_t *ctxt,
+ const char *cmdline,
+ unsigned long shared_info_frame,
+ unsigned int control_evtchn,
+ unsigned long flags,
+ struct mem_map * mem_mapp)
+{
+ l1_pgentry_t *vl1tab=NULL, *vl1e=NULL;
+ l2_pgentry_t *vl2tab=NULL, *vl2e=NULL;
+ unsigned long *page_array = NULL;
+ unsigned long l2tab;
+ unsigned long l1tab;
+ unsigned long count, i;
+ shared_info_t *shared_info;
+ struct linux_boot_params * boot_paramsp;
+ __u16 * boot_gdtp;
+ mmu_t *mmu = NULL;
+ int rc;
+
+ unsigned long nr_pt_pages;
+ unsigned long ppt_alloc;
+
+ struct domain_setup_info dsi;
+ unsigned long vinitrd_start;
+ unsigned long vinitrd_end;
+ unsigned long vboot_params_start;
+ unsigned long vboot_params_end;
+ unsigned long vboot_gdt_start;
+ unsigned long vboot_gdt_end;
+ unsigned long vpt_start;
+ unsigned long vpt_end;
+ unsigned long v_end;
+
+ memset(&dsi, 0, sizeof(struct domain_setup_info));
+
+ rc = parseelfimage(image, image_size, &dsi);
+ if ( rc != 0 )
+ goto error_out;
+
+ if (dsi.use_writable_pagetables)
+ xc_domain_setvmassist(xc_handle, dom, VMASST_CMD_enable,
+ VMASST_TYPE_writable_pagetables);
+
+ if (dsi.load_bsd_symtab)
+ loadelfsymtab(image, xc_handle, dom, NULL, &dsi);
+
+ if ( (dsi.v_start & (PAGE_SIZE-1)) != 0 )
+ {
+ PERROR("Guest OS must load to a page boundary.\n");
+ goto error_out;
+ }
+
+ /*
+ * Why do we need this? The number of page-table frames depends on the
+ * size of the bootstrap address space. But the size of the address space
+ * depends on the number of page-table frames (since each one is mapped
+ * read-only). We have a pair of simultaneous equations in two unknowns,
+ * which we solve by exhaustive search.
+ */
+ vboot_params_start = LINUX_BOOT_PARAMS_ADDR;
+ vboot_params_end = vboot_params_start + PAGE_SIZE;
+ vboot_gdt_start = vboot_params_end;
+ vboot_gdt_end = vboot_gdt_start + PAGE_SIZE;
+
+ /* memsize is in megabytes */
+ v_end = memsize << 20;
+ vinitrd_end = v_end - PAGE_SIZE; /* leaving the top 4k untouched for IO requests page use */
+ vinitrd_start = vinitrd_end - initrd_len;
+ vinitrd_start = vinitrd_start & (~(PAGE_SIZE - 1));
+
+ if(initrd_len == 0)
+ vinitrd_start = vinitrd_end = 0;
+
+ nr_pt_pages = 1 + ((memsize + 3) >> 2);
+ vpt_start = v_end;
+ vpt_end = vpt_start + (nr_pt_pages * PAGE_SIZE);
+
+ printf("VIRTUAL MEMORY ARRANGEMENT:\n"
+ " Boot_params: %08lx->%08lx\n"
+ " boot_gdt: %08lx->%08lx\n"
+ " Loaded kernel: %08lx->%08lx\n"
+ " Init. ramdisk: %08lx->%08lx\n"
+ " Page tables: %08lx->%08lx\n"
+ " TOTAL: %08lx->%08lx\n",
+ vboot_params_start, vboot_params_end,
+ vboot_gdt_start, vboot_gdt_end,
+ dsi.v_kernstart, dsi.v_kernend,
+ vinitrd_start, vinitrd_end,
+ vpt_start, vpt_end,
+ dsi.v_start, v_end);
+ printf(" ENTRY ADDRESS: %08lx\n", dsi.v_kernentry);
+ printf(" INITRD LENGTH: %08lx\n", initrd_len);
+
+ if ( (v_end - dsi.v_start) > (nr_pages * PAGE_SIZE) )
+ {
+ printf("Initial guest OS requires too much space\n"
+ "(%luMB is greater than %luMB limit)\n",
+ (v_end-dsi.v_start)>>20, (nr_pages<<PAGE_SHIFT)>>20);
+ goto error_out;
+ }
+
+ if ( (page_array = malloc(nr_pages * sizeof(unsigned long))) == NULL )
+ {
+ PERROR("Could not allocate memory");
+ goto error_out;
+ }
+
+ if ( xc_get_pfn_list(xc_handle, dom, page_array, nr_pages) != nr_pages )
+ {
+ PERROR("Could not get the page frame list");
+ goto error_out;
+ }
+
+ loadelfimage(image, xc_handle, dom, page_array, dsi.v_start);
+
+ if (dsi.load_bsd_symtab)
+ loadelfsymtab(image, xc_handle, dom, page_array, &dsi);
+
+ /* Load the initial ramdisk image. */
+ if ( initrd_len != 0 )
+ {
+ for ( i = (vinitrd_start - dsi.v_start);
+ i < (vinitrd_end - dsi.v_start); i += PAGE_SIZE )
+ {
+ char page[PAGE_SIZE];
+ if ( gzread(initrd_gfd, page, PAGE_SIZE) == -1 )
+ {
+ PERROR("Error reading initrd image, could not");
+ goto error_out;
+ }
+ xc_copy_to_domain_page(xc_handle, dom,
+ page_array[i>>PAGE_SHIFT], page);
+ }
+ }
+
+ if ( (mmu = init_mmu_updates(xc_handle, dom)) == NULL )
+ goto error_out;
+
+ /* First allocate page for page dir. */
+ ppt_alloc = (vpt_start - dsi.v_start) >> PAGE_SHIFT;
+ l2tab = page_array[ppt_alloc++] << PAGE_SHIFT;
+ ctxt->pt_base = l2tab;
+
+ /* Initialise the page tables. */
+ if ( (vl2tab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
+ PROT_READ|PROT_WRITE,
+ l2tab >> PAGE_SHIFT)) == NULL )
+ goto error_out;
+ memset(vl2tab, 0, PAGE_SIZE);
+ vl2e = &vl2tab[l2_table_offset(dsi.v_start)];
+ for ( count = 0; count < ((v_end-dsi.v_start)>>PAGE_SHIFT); count++ )
+ {
+ if ( ((unsigned long)vl1e & (PAGE_SIZE-1)) == 0 )
+ {
+ l1tab = page_array[ppt_alloc++] << PAGE_SHIFT;
+ if ( vl1tab != NULL )
+ munmap(vl1tab, PAGE_SIZE);
+ if ( (vl1tab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
+ PROT_READ|PROT_WRITE,
+ l1tab >> PAGE_SHIFT)) == NULL )
+ {
+ munmap(vl2tab, PAGE_SIZE);
+ goto error_out;
+ }
+ memset(vl1tab, 0, PAGE_SIZE);
+ vl1e = &vl1tab[l1_table_offset(dsi.v_start + (count<<PAGE_SHIFT))];
+ *vl2e++ = l1tab | L2_PROT;
+ }
+
+ *vl1e = (page_array[count] << PAGE_SHIFT) | L1_PROT;
+ vl1e++;
+ }
+ munmap(vl1tab, PAGE_SIZE);
+ munmap(vl2tab, PAGE_SIZE);
+
+ /*
+ * Pin down l2tab addr as page dir page - causes hypervisor to provide
+ * correct protection for the page
+ */
+ if ( add_mmu_update(xc_handle, mmu,
+ l2tab | MMU_EXTENDED_COMMAND, MMUEXT_PIN_L2_TABLE) )
+ goto error_out;
+
+ boot_paramsp = xc_map_foreign_range(
+ xc_handle, dom, PAGE_SIZE, PROT_READ|PROT_WRITE,
+ page_array[(vboot_params_start-dsi.v_start)>>PAGE_SHIFT]);
+ memset(boot_paramsp, 0, sizeof(*boot_paramsp));
+
+ strncpy(boot_paramsp->cmd_line, cmdline, 0x800);
+ boot_paramsp->cmd_line[0x800-1] = '\0';
+ boot_paramsp->cmd_line_ptr = ((unsigned long) vboot_params_start) + offsetof(struct linux_boot_params, cmd_line);
+
+ boot_paramsp->setup_sects = 0;
+ boot_paramsp->mount_root_rdonly = 1;
+ boot_paramsp->swapdev = 0x0;
+ boot_paramsp->ramdisk_flags = 0x0;
+ boot_paramsp->root_dev = 0x0; /* We must tell kernel root dev by kernel command line. */
+
+ /* we don't have a ps/2 mouse now.
+ * 0xAA means a aux mouse is there.
+ * See detect_auxiliary_port() in pc_keyb.c.
+ */
+ boot_paramsp->aux_device_info = 0x0;
+
+ boot_paramsp->header_magic[0] = 0x48; /* "H" */
+ boot_paramsp->header_magic[1] = 0x64; /* "d" */
+ boot_paramsp->header_magic[2] = 0x72; /* "r" */
+ boot_paramsp->header_magic[3] = 0x53; /* "S" */
+
+ boot_paramsp->protocol_version = 0x0203; /* 2.03 */
+ boot_paramsp->loader_type = 0x71; /* GRUB */
+ boot_paramsp->loader_flags = 0x1; /* loaded high */
+ boot_paramsp->code32_start = LINUX_KERNEL_ENTR_ADDR; /* 1MB */
+ boot_paramsp->initrd_start = vinitrd_start;
+ boot_paramsp->initrd_size = initrd_len;
+
+ i = ((memsize - 1) << 10) - 4;
+ boot_paramsp->alt_mem_k = i; /* alt_mem_k */
+ boot_paramsp->screen.overlap.ext_mem_k = i & 0xFFFF; /* ext_mem_k */
+
+ /*
+ * Stuff SCREAN_INFO
+ */
+ boot_paramsp->screen.info.orig_x = 0;
+ boot_paramsp->screen.info.orig_y = 0;
+ boot_paramsp->screen.info.orig_video_page = 8;
+ boot_paramsp->screen.info.orig_video_mode = 3;
+ boot_paramsp->screen.info.orig_video_cols = 80;
+ boot_paramsp->screen.info.orig_video_ega_bx = 0;
+ boot_paramsp->screen.info.orig_video_lines = 25;
+ boot_paramsp->screen.info.orig_video_isVGA = 1;
+ boot_paramsp->screen.info.orig_video_points = 0x0010;
+
+ /* seems we may NOT stuff boot_paramsp->apm_bios_info */
+ /* seems we may NOT stuff boot_paramsp->drive_info */
+ /* seems we may NOT stuff boot_paramsp->sys_desc_table */
+ *((unsigned short *) &boot_paramsp->drive_info.dummy[0]) = 800;
+ boot_paramsp->drive_info.dummy[2] = 4;
+ boot_paramsp->drive_info.dummy[14] = 32;
+
+ /* memsize is in megabytes */
+ build_e820map(mem_mapp, memsize << 20);
+ boot_paramsp->e820_map_nr = mem_mapp->nr_map;
+ for (i=0; i<mem_mapp->nr_map; i++) {
+ boot_paramsp->e820_map[i].addr = mem_mapp->map[i].addr;
+ boot_paramsp->e820_map[i].size = mem_mapp->map[i].size;
+ boot_paramsp->e820_map[i].type = mem_mapp->map[i].type;
+ }
+ munmap(boot_paramsp, PAGE_SIZE);
+
+ boot_gdtp = xc_map_foreign_range(
+ xc_handle, dom, PAGE_SIZE, PROT_READ|PROT_WRITE,
+ page_array[(vboot_gdt_start-dsi.v_start)>>PAGE_SHIFT]);
+ memset(boot_gdtp, 0, PAGE_SIZE);
+ boot_gdtp[12*4 + 0] = boot_gdtp[13*4 + 0] = 0xffff; /* limit */
+ boot_gdtp[12*4 + 1] = boot_gdtp[13*4 + 1] = 0x0000; /* base */
+ boot_gdtp[12*4 + 2] = 0x9a00; boot_gdtp[13*4 + 2] = 0x9200; /* perms */
+ boot_gdtp[12*4 + 3] = boot_gdtp[13*4 + 3] = 0x00cf; /* granu + top of limit */
+ munmap(boot_gdtp, PAGE_SIZE);
+
+ /* shared_info page starts its life empty. */
+ shared_info = xc_map_foreign_range(
+ xc_handle, dom, PAGE_SIZE, PROT_READ|PROT_WRITE, shared_info_frame);
+ memset(shared_info, 0, sizeof(shared_info_t));
+ /* Mask all upcalls... */
+ for ( i = 0; i < MAX_VIRT_CPUS; i++ )
+ shared_info->vcpu_data[i].evtchn_upcall_mask = 1;
+ munmap(shared_info, PAGE_SIZE);
+
+ /* Send the page update requests down to the hypervisor. */
+ if ( finish_mmu_updates(xc_handle, mmu) )
+ goto error_out;
+
+ free(mmu);
+ free(page_array);
+
+ /*
+ * Initial register values:
+ */
+ ctxt->cpu_ctxt.ds = 0x68;
+ ctxt->cpu_ctxt.es = 0x0;
+ ctxt->cpu_ctxt.fs = 0x0;
+ ctxt->cpu_ctxt.gs = 0x0;
+ ctxt->cpu_ctxt.ss = 0x68;
+ ctxt->cpu_ctxt.cs = 0x60;
+ ctxt->cpu_ctxt.eip = dsi.v_kernentry;
+ ctxt->cpu_ctxt.edx = vboot_gdt_start;
+ ctxt->cpu_ctxt.eax = 0x800;
+ ctxt->cpu_ctxt.esp = vboot_gdt_end;
+ ctxt->cpu_ctxt.ebx = 0; /* startup_32 expects this to be 0 to signal boot cpu */
+ ctxt->cpu_ctxt.ecx = mem_mapp->nr_map;
+ ctxt->cpu_ctxt.esi = vboot_params_start;
+ ctxt->cpu_ctxt.edi = vboot_params_start + 0x2d0;
+
+ ctxt->cpu_ctxt.eflags = (1<<2);
+
+ return 0;
+
+ error_out:
+ if ( mmu != NULL )
+ free(mmu);
+ if ( page_array != NULL )
+ free(page_array);
+ return -1;
+}
+
+
+#define VMX_FEATURE_FLAG 0x20
+
+int vmx_identify(void)
+{
+ int eax, ecx;
+
+ __asm__ __volatile__ ("cpuid"
+ : "=a" (eax), "=c" (ecx)
+ : "0" (1)
+ : "bx", "dx");
+ if (!(ecx & VMX_FEATURE_FLAG)) {
+ return -1;
+ }
+ return 0;
+}
+
+int xc_vmx_build(int xc_handle,
+ u32 domid,
+ int memsize,
+ const char *image_name,
+ struct mem_map *mem_mapp,
+ const char *ramdisk_name,
+ const char *cmdline,
+ unsigned int control_evtchn,
+ unsigned long flags)
+{
+ dom0_op_t launch_op, op;
+ int initrd_fd = -1;
+ gzFile initrd_gfd = NULL;
+ int rc, i;
+ full_execution_context_t st_ctxt, *ctxt = &st_ctxt;
+ unsigned long nr_pages;
+ char *image = NULL;
+ unsigned long image_size, initrd_size=0;
+
+ if ( vmx_identify() < 0 )
+ {
+ PERROR("CPU doesn't support VMX Extensions");
+ goto error_out;
+ }
+
+ if ( (nr_pages = xc_get_tot_pages(xc_handle, domid)) < 0 )
+ {
+ PERROR("Could not find total pages for domain");
+ goto error_out;
+ }
+
+ if ( (image = xc_read_kernel_image(image_name, &image_size)) == NULL )
+ goto error_out;
+
+ if ( (ramdisk_name != NULL) && (strlen(ramdisk_name) != 0) )
+ {
+ if ( (initrd_fd = open(ramdisk_name, O_RDONLY)) < 0 )
+ {
+ PERROR("Could not open the initial ramdisk image");
+ goto error_out;
+ }
+
+ initrd_size = xc_get_filesz(initrd_fd);
+
+ if ( (initrd_gfd = gzdopen(initrd_fd, "rb")) == NULL )
+ {
+ PERROR("Could not allocate decompression state for initrd");
+ goto error_out;
+ }
+ }
+
+ if ( mlock(&st_ctxt, sizeof(st_ctxt) ) )
+ {
+ PERROR("Unable to mlock ctxt");
+ return 1;
+ }
+
+ op.cmd = DOM0_GETDOMAININFO;
+ op.u.getdomaininfo.domain = (domid_t)domid;
+ op.u.getdomaininfo.exec_domain = 0;
+ op.u.getdomaininfo.ctxt = ctxt;
+ if ( (do_dom0_op(xc_handle, &op) < 0) ||
+ ((u16)op.u.getdomaininfo.domain != domid) )
+ {
+ PERROR("Could not get info on domain");
+ goto error_out;
+ }
+ if ( !(op.u.getdomaininfo.flags & DOMFLAGS_PAUSED) ||
+ (ctxt->pt_base != 0) )
+ {
+ ERROR("Domain is already constructed");
+ goto error_out;
+ }
+
+ if ( setup_guestos(xc_handle, domid, memsize, image, image_size,
+ initrd_gfd, initrd_size, nr_pages,
+ ctxt, cmdline,
+ op.u.getdomaininfo.shared_info_frame,
+ control_evtchn, flags, mem_mapp) < 0 )
+ {
+ ERROR("Error constructing guest OS");
+ goto error_out;
+ }
+
+ if ( initrd_fd >= 0 )
+ close(initrd_fd);
+ if ( initrd_gfd )
+ gzclose(initrd_gfd);
+ if ( image != NULL )
+ free(image);
+
+ ctxt->flags = ECF_VMX_GUEST;
+ /* FPU is set up to default initial state. */
+ memset(ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
+
+ /* Virtual IDT is empty at start-of-day. */
+ for ( i = 0; i < 256; i++ )
+ {
+ ctxt->trap_ctxt[i].vector = i;
+ ctxt->trap_ctxt[i].cs = FLAT_GUESTOS_CS;
+ }
+ ctxt->fast_trap_idx = 0;
+
+ /* No LDT. */
+ ctxt->ldt_ents = 0;
+
+ /* Use the default Xen-provided GDT. */
+ ctxt->gdt_ents = 0;
+
+ /* Ring 1 stack is the initial stack. */
+/*
+ ctxt->guestos_ss = FLAT_GUESTOS_DS;
+ ctxt->guestos_esp = vstartinfo_start;
+*/
+ /* No debugging. */
+ memset(ctxt->debugreg, 0, sizeof(ctxt->debugreg));
+
+ /* No callback handlers. */
+ ctxt->event_callback_cs = FLAT_GUESTOS_CS;
+ ctxt->event_callback_eip = 0;
+ ctxt->failsafe_callback_cs = FLAT_GUESTOS_CS;
+ ctxt->failsafe_callback_eip = 0;
+
+ memset( &launch_op, 0, sizeof(launch_op) );
+
+ launch_op.u.builddomain.domain = (domid_t)domid;
+ launch_op.u.builddomain.ctxt = ctxt;
+
+ launch_op.cmd = DOM0_BUILDDOMAIN;
+ rc = do_dom0_op(xc_handle, &launch_op);
+ return rc;
+
+ error_out:
+ if ( initrd_gfd != NULL )
+ gzclose(initrd_gfd);
+ else if ( initrd_fd >= 0 )
+ close(initrd_fd);
+ if ( image != NULL )
+ free(image);
+
+ return -1;
+}
+
+static inline int is_loadable_phdr(Elf_Phdr *phdr)
+{
+ return ((phdr->p_type == PT_LOAD) &&
+ ((phdr->p_flags & (PF_W|PF_X)) != 0));
+}
+
+static int parseelfimage(char *elfbase,
+ unsigned long elfsize,
+ struct domain_setup_info *dsi)
+{
+ Elf_Ehdr *ehdr = (Elf_Ehdr *)elfbase;
+ Elf_Phdr *phdr;
+ Elf_Shdr *shdr;
+ unsigned long kernstart = ~0UL, kernend=0UL;
+ char *shstrtab;
+ int h;
+
+ if ( !IS_ELF(*ehdr) )
+ {
+ ERROR("Kernel image does not have an ELF header.");
+ return -EINVAL;
+ }
+
+ if ( (ehdr->e_phoff + (ehdr->e_phnum * ehdr->e_phentsize)) > elfsize )
+ {
+ ERROR("ELF program headers extend beyond end of image.");
+ return -EINVAL;
+ }
+
+ if ( (ehdr->e_shoff + (ehdr->e_shnum * ehdr->e_shentsize)) > elfsize )
+ {
+ ERROR("ELF section headers extend beyond end of image.");
+ return -EINVAL;
+ }
+
+ /* Find the section-header strings table. */
+ if ( ehdr->e_shstrndx == SHN_UNDEF )
+ {
+ ERROR("ELF image has no section-header strings table (shstrtab).");
+ return -EINVAL;
+ }
+ shdr = (Elf_Shdr *)(elfbase + ehdr->e_shoff +
+ (ehdr->e_shstrndx*ehdr->e_shentsize));
+ shstrtab = elfbase + shdr->sh_offset;
+
+ for ( h = 0; h < ehdr->e_phnum; h++ )
+ {
+ phdr = (Elf_Phdr *)(elfbase + ehdr->e_phoff + (h*ehdr->e_phentsize));
+ if ( !is_loadable_phdr(phdr) )
+ continue;
+ if ( phdr->p_vaddr < kernstart )
+ kernstart = phdr->p_vaddr;
+ if ( (phdr->p_vaddr + phdr->p_memsz) > kernend )
+ kernend = phdr->p_vaddr + phdr->p_memsz;
+ }
+
+ if ( (kernstart > kernend) ||
+ (ehdr->e_entry < kernstart) ||
+ (ehdr->e_entry > kernend) )
+ {
+ ERROR("Malformed ELF image.");
+ return -EINVAL;
+ }
+
+ dsi->v_start = 0x00000000;
+ dsi->use_writable_pagetables = 0;
+ dsi->load_bsd_symtab = 0;
+
+ dsi->v_kernstart = kernstart - LINUX_PAGE_OFFSET;
+ dsi->v_kernend = kernend - LINUX_PAGE_OFFSET;
+ dsi->v_kernentry = LINUX_KERNEL_ENTR_ADDR;
+
+ dsi->v_end = dsi->v_kernend;
+
+ return 0;
+}
+
+static int
+loadelfimage(
+ char *elfbase, int xch, u32 dom, unsigned long *parray,
+ unsigned long vstart)
+{
+ Elf_Ehdr *ehdr = (Elf_Ehdr *)elfbase;
+ Elf_Phdr *phdr;
+ int h;
+
+ char *va;
+ unsigned long pa, done, chunksz;
+
+ for ( h = 0; h < ehdr->e_phnum; h++ )
+ {
+ phdr = (Elf_Phdr *)(elfbase + ehdr->e_phoff + (h*ehdr->e_phentsize));
+ if ( !is_loadable_phdr(phdr) )
+ continue;
+
+ for ( done = 0; done < phdr->p_filesz; done += chunksz )
+ {
+ pa = (phdr->p_vaddr + done) - vstart - LINUX_PAGE_OFFSET;
+ va = xc_map_foreign_range(
+ xch, dom, PAGE_SIZE, PROT_WRITE, parray[pa>>PAGE_SHIFT]);
+ chunksz = phdr->p_filesz - done;
+ if ( chunksz > (PAGE_SIZE - (pa & (PAGE_SIZE-1))) )
+ chunksz = PAGE_SIZE - (pa & (PAGE_SIZE-1));
+ memcpy(va + (pa & (PAGE_SIZE-1)),
+ elfbase + phdr->p_offset + done, chunksz);
+ munmap(va, PAGE_SIZE);
+ }
+
+ for ( ; done < phdr->p_memsz; done += chunksz )
+ {
+ pa = (phdr->p_vaddr + done) - vstart - LINUX_PAGE_OFFSET;
+ va = xc_map_foreign_range(
+ xch, dom, PAGE_SIZE, PROT_WRITE, parray[pa>>PAGE_SHIFT]);
+ chunksz = phdr->p_memsz - done;
+ if ( chunksz > (PAGE_SIZE - (pa & (PAGE_SIZE-1))) )
+ chunksz = PAGE_SIZE - (pa & (PAGE_SIZE-1));
+ memset(va + (pa & (PAGE_SIZE-1)), 0, chunksz);
+ munmap(va, PAGE_SIZE);
+ }
+ }
+
+ return 0;
+}
+
+
+#define ELFROUND (ELFSIZE / 8)
+
+static int
+loadelfsymtab(
+ char *elfbase, int xch, u32 dom, unsigned long *parray,
+ struct domain_setup_info *dsi)
+{
+ Elf_Ehdr *ehdr = (Elf_Ehdr *)elfbase, *sym_ehdr;
+ Elf_Shdr *shdr;
+ unsigned long maxva, symva;
+ char *p;
+ int h, i;
+
+ p = malloc(sizeof(int) + sizeof(Elf_Ehdr) +
+ ehdr->e_shnum * sizeof(Elf_Shdr));
+ if (p == NULL)
+ return 0;
+
+ maxva = (dsi->v_kernend + ELFROUND - 1) & ~(ELFROUND - 1);
+ symva = maxva;
+ maxva += sizeof(int);
+ dsi->symtab_addr = maxva;
+ dsi->symtab_len = 0;
+ maxva += sizeof(Elf_Ehdr) + ehdr->e_shnum * sizeof(Elf_Shdr);
+ maxva = (maxva + ELFROUND - 1) & ~(ELFROUND - 1);
+
+ shdr = (Elf_Shdr *)(p + sizeof(int) + sizeof(Elf_Ehdr));
+ memcpy(shdr, elfbase + ehdr->e_shoff, ehdr->e_shnum * sizeof(Elf_Shdr));
+
+ for ( h = 0; h < ehdr->e_shnum; h++ )
+ {
+ if ( shdr[h].sh_type == SHT_STRTAB )
+ {
+ /* Look for a strtab @i linked to symtab @h. */
+ for ( i = 0; i < ehdr->e_shnum; i++ )
+ if ( (shdr[i].sh_type == SHT_SYMTAB) &&
+ (shdr[i].sh_link == h) )
+ break;
+ /* Skip symtab @h if we found no corresponding strtab @i. */
+ if ( i == ehdr->e_shnum )
+ {
+ shdr[h].sh_offset = 0;
+ continue;
+ }
+ }
+
+ if ( (shdr[h].sh_type == SHT_STRTAB) ||
+ (shdr[h].sh_type == SHT_SYMTAB) )
+ {
+ if ( parray != NULL )
+ xc_map_memcpy(maxva, elfbase + shdr[h].sh_offset, shdr[h].sh_size,
+ xch, dom, parray, dsi->v_start);
+
+ /* Mangled to be based on ELF header location. */
+ shdr[h].sh_offset = maxva - dsi->symtab_addr;
+
+ dsi->symtab_len += shdr[h].sh_size;
+ maxva += shdr[h].sh_size;
+ maxva = (maxva + ELFROUND - 1) & ~(ELFROUND - 1);
+ }
+
+ shdr[h].sh_name = 0; /* Name is NULL. */
+ }
+
+ if ( dsi->symtab_len == 0 )
+ {
+ dsi->symtab_addr = 0;
+ goto out;
+ }
+
+ if ( parray != NULL )
+ {
+ *(int *)p = maxva - dsi->symtab_addr;
+ sym_ehdr = (Elf_Ehdr *)(p + sizeof(int));
+ memcpy(sym_ehdr, ehdr, sizeof(Elf_Ehdr));
+ sym_ehdr->e_phoff = 0;
+ sym_ehdr->e_shoff = sizeof(Elf_Ehdr);
+ sym_ehdr->e_phentsize = 0;
+ sym_ehdr->e_phnum = 0;
+ sym_ehdr->e_shstrndx = SHN_UNDEF;
+
+ /* Copy total length, crafted ELF header and section header table */
+ xc_map_memcpy(symva, p, sizeof(int) + sizeof(Elf_Ehdr) +
+ ehdr->e_shnum * sizeof(Elf_Shdr), xch, dom, parray,
+ dsi->v_start);
+ }
+
+ dsi->symtab_len = maxva - dsi->symtab_addr;
+ dsi->v_end = round_pgup(maxva);
+
+ out:
+ if ( p != NULL )
+ free(p);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-09 15:40:25 +0000