diff options
Diffstat (limited to 'arch/mips/kernel/vpe.c')
| -rw-r--r-- | arch/mips/kernel/vpe.c | 900 |
1 files changed, 900 insertions, 0 deletions
diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c new file mode 100644 index 000000000..132949727 --- /dev/null +++ b/arch/mips/kernel/vpe.c @@ -0,0 +1,900 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved. + * Copyright (C) 2013 Imagination Technologies Ltd. + * + * VPE spport module for loading a MIPS SP program into VPE1. The SP + * environment is rather simple since there are no TLBs. It needs + * to be relocatable (or partiall linked). Initialize your stack in + * the startup-code. The loader looks for the symbol __start and sets + * up the execution to resume from there. To load and run, simply do + * a cat SP 'binary' to the /dev/vpe1 device. + */ +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/list.h> +#include <linux/vmalloc.h> +#include <linux/elf.h> +#include <linux/seq_file.h> +#include <linux/syscalls.h> +#include <linux/moduleloader.h> +#include <linux/interrupt.h> +#include <linux/poll.h> +#include <linux/memblock.h> +#include <asm/mipsregs.h> +#include <asm/mipsmtregs.h> +#include <asm/cacheflush.h> +#include <linux/atomic.h> +#include <asm/mips_mt.h> +#include <asm/processor.h> +#include <asm/vpe.h> + +#ifndef ARCH_SHF_SMALL +#define ARCH_SHF_SMALL 0 +#endif + +/* If this is set, the section belongs in the init part of the module */ +#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) + +struct vpe_control vpecontrol = { + .vpe_list_lock = __SPIN_LOCK_UNLOCKED(vpe_list_lock), + .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list), + .tc_list_lock = __SPIN_LOCK_UNLOCKED(tc_list_lock), + .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list) +}; + +/* get the vpe associated with this minor */ +struct vpe *get_vpe(int minor) +{ + struct vpe *res, *v; + + if (!cpu_has_mipsmt) + return NULL; + + res = NULL; + spin_lock(&vpecontrol.vpe_list_lock); + list_for_each_entry(v, &vpecontrol.vpe_list, list) { + if (v->minor == VPE_MODULE_MINOR) { + res = v; + break; + } + } + spin_unlock(&vpecontrol.vpe_list_lock); + + return res; +} + +/* get the vpe associated with this minor */ +struct tc *get_tc(int index) +{ + struct tc *res, *t; + + res = NULL; + spin_lock(&vpecontrol.tc_list_lock); + list_for_each_entry(t, &vpecontrol.tc_list, list) { + if (t->index == index) { + res = t; + break; + } + } + spin_unlock(&vpecontrol.tc_list_lock); + + return res; +} + +/* allocate a vpe and associate it with this minor (or index) */ +struct vpe *alloc_vpe(int minor) +{ + struct vpe *v; + + v = kzalloc(sizeof(struct vpe), GFP_KERNEL); + if (v == NULL) + goto out; + + INIT_LIST_HEAD(&v->tc); + spin_lock(&vpecontrol.vpe_list_lock); + list_add_tail(&v->list, &vpecontrol.vpe_list); + spin_unlock(&vpecontrol.vpe_list_lock); + + INIT_LIST_HEAD(&v->notify); + v->minor = VPE_MODULE_MINOR; + +out: + return v; +} + +/* allocate a tc. At startup only tc0 is running, all other can be halted. */ +struct tc *alloc_tc(int index) +{ + struct tc *tc; + + tc = kzalloc(sizeof(struct tc), GFP_KERNEL); + if (tc == NULL) + goto out; + + INIT_LIST_HEAD(&tc->tc); + tc->index = index; + + spin_lock(&vpecontrol.tc_list_lock); + list_add_tail(&tc->list, &vpecontrol.tc_list); + spin_unlock(&vpecontrol.tc_list_lock); + +out: + return tc; +} + +/* clean up and free everything */ +void release_vpe(struct vpe *v) +{ + list_del(&v->list); + if (v->load_addr) + release_progmem(v->load_addr); + kfree(v); +} + +/* Find some VPE program space */ +void *alloc_progmem(unsigned long len) +{ + void *addr; + +#ifdef CONFIG_MIPS_VPE_LOADER_TOM + /* + * This means you must tell Linux to use less memory than you + * physically have, for example by passing a mem= boot argument. + */ + addr = pfn_to_kaddr(max_low_pfn); + memset(addr, 0, len); +#else + /* simple grab some mem for now */ + addr = kzalloc(len, GFP_KERNEL); +#endif + + return addr; +} + +void release_progmem(void *ptr) +{ +#ifndef CONFIG_MIPS_VPE_LOADER_TOM + kfree(ptr); +#endif +} + +/* Update size with this section: return offset. */ +static long get_offset(unsigned long *size, Elf_Shdr *sechdr) +{ + long ret; + + ret = ALIGN(*size, sechdr->sh_addralign ? : 1); + *size = ret + sechdr->sh_size; + return ret; +} + +/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld + might -- code, read-only data, read-write data, small data. Tally + sizes, and place the offsets into sh_entsize fields: high bit means it + belongs in init. */ +static void layout_sections(struct module *mod, const Elf_Ehdr *hdr, + Elf_Shdr *sechdrs, const char *secstrings) +{ + static unsigned long const masks[][2] = { + /* NOTE: all executable code must be the first section + * in this array; otherwise modify the text_size + * finder in the two loops below */ + {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL}, + {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL}, + {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL}, + {ARCH_SHF_SMALL | SHF_ALLOC, 0} + }; + unsigned int m, i; + + for (i = 0; i < hdr->e_shnum; i++) + sechdrs[i].sh_entsize = ~0UL; + + for (m = 0; m < ARRAY_SIZE(masks); ++m) { + for (i = 0; i < hdr->e_shnum; ++i) { + Elf_Shdr *s = &sechdrs[i]; + + if ((s->sh_flags & masks[m][0]) != masks[m][0] + || (s->sh_flags & masks[m][1]) + || s->sh_entsize != ~0UL) + continue; + s->sh_entsize = + get_offset((unsigned long *)&mod->core_layout.size, s); + } + + if (m == 0) + mod->core_layout.text_size = mod->core_layout.size; + + } +} + +/* from module-elf32.c, but subverted a little */ + +struct mips_hi16 { + struct mips_hi16 *next; + Elf32_Addr *addr; + Elf32_Addr value; +}; + +static struct mips_hi16 *mips_hi16_list; +static unsigned int gp_offs, gp_addr; + +static int apply_r_mips_none(struct module *me, uint32_t *location, + Elf32_Addr v) +{ + return 0; +} + +static int apply_r_mips_gprel16(struct module *me, uint32_t *location, + Elf32_Addr v) +{ + int rel; + + if (!(*location & 0xffff)) { + rel = (int)v - gp_addr; + } else { + /* .sbss + gp(relative) + offset */ + /* kludge! */ + rel = (int)(short)((int)v + gp_offs + + (int)(short)(*location & 0xffff) - gp_addr); + } + + if ((rel > 32768) || (rel < -32768)) { + pr_debug("VPE loader: apply_r_mips_gprel16: relative address 0x%x out of range of gp register\n", + rel); + return -ENOEXEC; + } + + *location = (*location & 0xffff0000) | (rel & 0xffff); + + return 0; +} + +static int apply_r_mips_pc16(struct module *me, uint32_t *location, + Elf32_Addr v) +{ + int rel; + rel = (((unsigned int)v - (unsigned int)location)); + rel >>= 2; /* because the offset is in _instructions_ not bytes. */ + rel -= 1; /* and one instruction less due to the branch delay slot. */ + + if ((rel > 32768) || (rel < -32768)) { + pr_debug("VPE loader: apply_r_mips_pc16: relative address out of range 0x%x\n", + rel); + return -ENOEXEC; + } + + *location = (*location & 0xffff0000) | (rel & 0xffff); + + return 0; +} + +static int apply_r_mips_32(struct module *me, uint32_t *location, + Elf32_Addr v) +{ + *location += v; + + return 0; +} + +static int apply_r_mips_26(struct module *me, uint32_t *location, + Elf32_Addr v) +{ + if (v % 4) { + pr_debug("VPE loader: apply_r_mips_26: unaligned relocation\n"); + return -ENOEXEC; + } + +/* + * Not desperately convinced this is a good check of an overflow condition + * anyway. But it gets in the way of handling undefined weak symbols which + * we want to set to zero. + * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { + * printk(KERN_ERR + * "module %s: relocation overflow\n", + * me->name); + * return -ENOEXEC; + * } + */ + + *location = (*location & ~0x03ffffff) | + ((*location + (v >> 2)) & 0x03ffffff); + return 0; +} + +static int apply_r_mips_hi16(struct module *me, uint32_t *location, + Elf32_Addr v) +{ + struct mips_hi16 *n; + + /* + * We cannot relocate this one now because we don't know the value of + * the carry we need to add. Save the information, and let LO16 do the + * actual relocation. + */ + n = kmalloc(sizeof(*n), GFP_KERNEL); + if (!n) + return -ENOMEM; + + n->addr = location; + n->value = v; + n->next = mips_hi16_list; + mips_hi16_list = n; + + return 0; +} + +static int apply_r_mips_lo16(struct module *me, uint32_t *location, + Elf32_Addr v) +{ + unsigned long insnlo = *location; + Elf32_Addr val, vallo; + struct mips_hi16 *l, *next; + + /* Sign extend the addend we extract from the lo insn. */ + vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000; + + if (mips_hi16_list != NULL) { + + l = mips_hi16_list; + while (l != NULL) { + unsigned long insn; + + /* + * The value for the HI16 had best be the same. + */ + if (v != l->value) { + pr_debug("VPE loader: apply_r_mips_lo16/hi16: inconsistent value information\n"); + goto out_free; + } + + /* + * Do the HI16 relocation. Note that we actually don't + * need to know anything about the LO16 itself, except + * where to find the low 16 bits of the addend needed + * by the LO16. + */ + insn = *l->addr; + val = ((insn & 0xffff) << 16) + vallo; + val += v; + + /* + * Account for the sign extension that will happen in + * the low bits. + */ + val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff; + + insn = (insn & ~0xffff) | val; + *l->addr = insn; + + next = l->next; + kfree(l); + l = next; + } + + mips_hi16_list = NULL; + } + + /* + * Ok, we're done with the HI16 relocs. Now deal with the LO16. + */ + val = v + vallo; + insnlo = (insnlo & ~0xffff) | (val & 0xffff); + *location = insnlo; + + return 0; + +out_free: + while (l != NULL) { + next = l->next; + kfree(l); + l = next; + } + mips_hi16_list = NULL; + + return -ENOEXEC; +} + +static int (*reloc_handlers[]) (struct module *me, uint32_t *location, + Elf32_Addr v) = { + [R_MIPS_NONE] = apply_r_mips_none, + [R_MIPS_32] = apply_r_mips_32, + [R_MIPS_26] = apply_r_mips_26, + [R_MIPS_HI16] = apply_r_mips_hi16, + [R_MIPS_LO16] = apply_r_mips_lo16, + [R_MIPS_GPREL16] = apply_r_mips_gprel16, + [R_MIPS_PC16] = apply_r_mips_pc16 +}; + +static char *rstrs[] = { + [R_MIPS_NONE] = "MIPS_NONE", + [R_MIPS_32] = "MIPS_32", + [R_MIPS_26] = "MIPS_26", + [R_MIPS_HI16] = "MIPS_HI16", + [R_MIPS_LO16] = "MIPS_LO16", + [R_MIPS_GPREL16] = "MIPS_GPREL16", + [R_MIPS_PC16] = "MIPS_PC16" +}; + +static int apply_relocations(Elf32_Shdr *sechdrs, + const char *strtab, + unsigned int symindex, + unsigned int relsec, + struct module *me) +{ + Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr; + Elf32_Sym *sym; + uint32_t *location; + unsigned int i; + Elf32_Addr v; + int res; + + for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { + Elf32_Word r_info = rel[i].r_info; + + /* This is where to make the change */ + location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + + rel[i].r_offset; + /* This is the symbol it is referring to */ + sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + + ELF32_R_SYM(r_info); + + if (!sym->st_value) { + pr_debug("%s: undefined weak symbol %s\n", + me->name, strtab + sym->st_name); + /* just print the warning, dont barf */ + } + + v = sym->st_value; + + res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v); + if (res) { + char *r = rstrs[ELF32_R_TYPE(r_info)]; + pr_warn("VPE loader: .text+0x%x relocation type %s for symbol \"%s\" failed\n", + rel[i].r_offset, r ? r : "UNKNOWN", + strtab + sym->st_name); + return res; + } + } + + return 0; +} + +static inline void save_gp_address(unsigned int secbase, unsigned int rel) +{ + gp_addr = secbase + rel; + gp_offs = gp_addr - (secbase & 0xffff0000); +} +/* end module-elf32.c */ + +/* Change all symbols so that sh_value encodes the pointer directly. */ +static void simplify_symbols(Elf_Shdr *sechdrs, + unsigned int symindex, + const char *strtab, + const char *secstrings, + unsigned int nsecs, struct module *mod) +{ + Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; + unsigned long secbase, bssbase = 0; + unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); + int size; + + /* find the .bss section for COMMON symbols */ + for (i = 0; i < nsecs; i++) { + if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) { + bssbase = sechdrs[i].sh_addr; + break; + } + } + + for (i = 1; i < n; i++) { + switch (sym[i].st_shndx) { + case SHN_COMMON: + /* Allocate space for the symbol in the .bss section. + st_value is currently size. + We want it to have the address of the symbol. */ + + size = sym[i].st_value; + sym[i].st_value = bssbase; + + bssbase += size; + break; + + case SHN_ABS: + /* Don't need to do anything */ + break; + + case SHN_UNDEF: + /* ret = -ENOENT; */ + break; + + case SHN_MIPS_SCOMMON: + pr_debug("simplify_symbols: ignoring SHN_MIPS_SCOMMON symbol <%s> st_shndx %d\n", + strtab + sym[i].st_name, sym[i].st_shndx); + /* .sbss section */ + break; + + default: + secbase = sechdrs[sym[i].st_shndx].sh_addr; + + if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) + save_gp_address(secbase, sym[i].st_value); + + sym[i].st_value += secbase; + break; + } + } +} + +#ifdef DEBUG_ELFLOADER +static void dump_elfsymbols(Elf_Shdr *sechdrs, unsigned int symindex, + const char *strtab, struct module *mod) +{ + Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; + unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); + + pr_debug("dump_elfsymbols: n %d\n", n); + for (i = 1; i < n; i++) { + pr_debug(" i %d name <%s> 0x%x\n", i, strtab + sym[i].st_name, + sym[i].st_value); + } +} +#endif + +static int find_vpe_symbols(struct vpe *v, Elf_Shdr *sechdrs, + unsigned int symindex, const char *strtab, + struct module *mod) +{ + Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; + unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); + + for (i = 1; i < n; i++) { + if (strcmp(strtab + sym[i].st_name, "__start") == 0) + v->__start = sym[i].st_value; + + if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) + v->shared_ptr = (void *)sym[i].st_value; + } + + if ((v->__start == 0) || (v->shared_ptr == NULL)) + return -1; + + return 0; +} + +/* + * Allocates a VPE with some program code space(the load address), copies the + * contents of the program (p)buffer performing relocatations/etc, free's it + * when finished. + */ +static int vpe_elfload(struct vpe *v) +{ + Elf_Ehdr *hdr; + Elf_Shdr *sechdrs; + long err = 0; + char *secstrings, *strtab = NULL; + unsigned int len, i, symindex = 0, strindex = 0, relocate = 0; + struct module mod; /* so we can re-use the relocations code */ + + memset(&mod, 0, sizeof(struct module)); + strcpy(mod.name, "VPE loader"); + + hdr = (Elf_Ehdr *) v->pbuffer; + len = v->plen; + + /* Sanity checks against insmoding binaries or wrong arch, + weird elf version */ + if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 + || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC) + || !elf_check_arch(hdr) + || hdr->e_shentsize != sizeof(*sechdrs)) { + pr_warn("VPE loader: program wrong arch or weird elf version\n"); + + return -ENOEXEC; + } + + if (hdr->e_type == ET_REL) + relocate = 1; + + if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) { + pr_err("VPE loader: program length %u truncated\n", len); + + return -ENOEXEC; + } + + /* Convenience variables */ + sechdrs = (void *)hdr + hdr->e_shoff; + secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; + sechdrs[0].sh_addr = 0; + + /* And these should exist, but gcc whinges if we don't init them */ + symindex = strindex = 0; + + if (relocate) { + for (i = 1; i < hdr->e_shnum; i++) { + if ((sechdrs[i].sh_type != SHT_NOBITS) && + (len < sechdrs[i].sh_offset + sechdrs[i].sh_size)) { + pr_err("VPE program length %u truncated\n", + len); + return -ENOEXEC; + } + + /* Mark all sections sh_addr with their address in the + temporary image. */ + sechdrs[i].sh_addr = (size_t) hdr + + sechdrs[i].sh_offset; + + /* Internal symbols and strings. */ + if (sechdrs[i].sh_type == SHT_SYMTAB) { + symindex = i; + strindex = sechdrs[i].sh_link; + strtab = (char *)hdr + + sechdrs[strindex].sh_offset; + } + } + layout_sections(&mod, hdr, sechdrs, secstrings); + } + + v->load_addr = alloc_progmem(mod.core_layout.size); + if (!v->load_addr) + return -ENOMEM; + + pr_info("VPE loader: loading to %p\n", v->load_addr); + + if (relocate) { + for (i = 0; i < hdr->e_shnum; i++) { + void *dest; + + if (!(sechdrs[i].sh_flags & SHF_ALLOC)) + continue; + + dest = v->load_addr + sechdrs[i].sh_entsize; + + if (sechdrs[i].sh_type != SHT_NOBITS) + memcpy(dest, (void *)sechdrs[i].sh_addr, + sechdrs[i].sh_size); + /* Update sh_addr to point to copy in image. */ + sechdrs[i].sh_addr = (unsigned long)dest; + + pr_debug(" section sh_name %s sh_addr 0x%x\n", + secstrings + sechdrs[i].sh_name, + sechdrs[i].sh_addr); + } + + /* Fix up syms, so that st_value is a pointer to location. */ + simplify_symbols(sechdrs, symindex, strtab, secstrings, + hdr->e_shnum, &mod); + + /* Now do relocations. */ + for (i = 1; i < hdr->e_shnum; i++) { + const char *strtab = (char *)sechdrs[strindex].sh_addr; + unsigned int info = sechdrs[i].sh_info; + + /* Not a valid relocation section? */ + if (info >= hdr->e_shnum) + continue; + + /* Don't bother with non-allocated sections */ + if (!(sechdrs[info].sh_flags & SHF_ALLOC)) + continue; + + if (sechdrs[i].sh_type == SHT_REL) + err = apply_relocations(sechdrs, strtab, + symindex, i, &mod); + else if (sechdrs[i].sh_type == SHT_RELA) + err = apply_relocate_add(sechdrs, strtab, + symindex, i, &mod); + if (err < 0) + return err; + + } + } else { + struct elf_phdr *phdr = (struct elf_phdr *) + ((char *)hdr + hdr->e_phoff); + + for (i = 0; i < hdr->e_phnum; i++) { + if (phdr->p_type == PT_LOAD) { + memcpy((void *)phdr->p_paddr, + (char *)hdr + phdr->p_offset, + phdr->p_filesz); + memset((void *)phdr->p_paddr + phdr->p_filesz, + 0, phdr->p_memsz - phdr->p_filesz); + } + phdr++; + } + + for (i = 0; i < hdr->e_shnum; i++) { + /* Internal symbols and strings. */ + if (sechdrs[i].sh_type == SHT_SYMTAB) { + symindex = i; + strindex = sechdrs[i].sh_link; + strtab = (char *)hdr + + sechdrs[strindex].sh_offset; + + /* + * mark symtab's address for when we try + * to find the magic symbols + */ + sechdrs[i].sh_addr = (size_t) hdr + + sechdrs[i].sh_offset; + } + } + } + + /* make sure it's physically written out */ + flush_icache_range((unsigned long)v->load_addr, + (unsigned long)v->load_addr + v->len); + + if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) { + if (v->__start == 0) { + pr_warn("VPE loader: program does not contain a __start symbol\n"); + return -ENOEXEC; + } + + if (v->shared_ptr == NULL) + pr_warn("VPE loader: program does not contain vpe_shared symbol.\n" + " Unable to use AMVP (AP/SP) facilities.\n"); + } + + pr_info(" elf loaded\n"); + return 0; +} + +/* checks VPE is unused and gets ready to load program */ +static int vpe_open(struct inode *inode, struct file *filp) +{ + enum vpe_state state; + struct vpe_notifications *notifier; + struct vpe *v; + + if (VPE_MODULE_MINOR != iminor(inode)) { + /* assume only 1 device at the moment. */ + pr_warn("VPE loader: only vpe1 is supported\n"); + + return -ENODEV; + } + + v = get_vpe(aprp_cpu_index()); + if (v == NULL) { + pr_warn("VPE loader: unable to get vpe\n"); + + return -ENODEV; + } + + state = xchg(&v->state, VPE_STATE_INUSE); + if (state != VPE_STATE_UNUSED) { + pr_debug("VPE loader: tc in use dumping regs\n"); + + list_for_each_entry(notifier, &v->notify, list) + notifier->stop(aprp_cpu_index()); + + release_progmem(v->load_addr); + cleanup_tc(get_tc(aprp_cpu_index())); + } + + /* this of-course trashes what was there before... */ + v->pbuffer = vmalloc(P_SIZE); + if (!v->pbuffer) { + pr_warn("VPE loader: unable to allocate memory\n"); + return -ENOMEM; + } + v->plen = P_SIZE; + v->load_addr = NULL; + v->len = 0; + v->shared_ptr = NULL; + v->__start = 0; + + return 0; +} + +static int vpe_release(struct inode *inode, struct file *filp) +{ +#if defined(CONFIG_MIPS_VPE_LOADER_MT) || defined(CONFIG_MIPS_VPE_LOADER_CMP) + struct vpe *v; + Elf_Ehdr *hdr; + int ret = 0; + + v = get_vpe(aprp_cpu_index()); + if (v == NULL) + return -ENODEV; + + hdr = (Elf_Ehdr *) v->pbuffer; + if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) { + if (vpe_elfload(v) >= 0) { + vpe_run(v); + } else { + pr_warn("VPE loader: ELF load failed.\n"); + ret = -ENOEXEC; + } + } else { + pr_warn("VPE loader: only elf files are supported\n"); + ret = -ENOEXEC; + } + + /* It's good to be able to run the SP and if it chokes have a look at + the /dev/rt?. But if we reset the pointer to the shared struct we + lose what has happened. So perhaps if garbage is sent to the vpe + device, use it as a trigger for the reset. Hopefully a nice + executable will be along shortly. */ + if (ret < 0) + v->shared_ptr = NULL; + + vfree(v->pbuffer); + v->plen = 0; + + return ret; +#else + pr_warn("VPE loader: ELF load failed.\n"); + return -ENOEXEC; +#endif +} + +static ssize_t vpe_write(struct file *file, const char __user *buffer, + size_t count, loff_t *ppos) +{ + size_t ret = count; + struct vpe *v; + + if (iminor(file_inode(file)) != VPE_MODULE_MINOR) + return -ENODEV; + + v = get_vpe(aprp_cpu_index()); + + if (v == NULL) + return -ENODEV; + + if ((count + v->len) > v->plen) { + pr_warn("VPE loader: elf size too big. Perhaps strip unneeded symbols\n"); + return -ENOMEM; + } + + count -= copy_from_user(v->pbuffer + v->len, buffer, count); + if (!count) + return -EFAULT; + + v->len += count; + return ret; +} + +const struct file_operations vpe_fops = { + .owner = THIS_MODULE, + .open = vpe_open, + .release = vpe_release, + .write = vpe_write, + .llseek = noop_llseek, +}; + +void *vpe_get_shared(int index) +{ + struct vpe *v = get_vpe(index); + + if (v == NULL) + return NULL; + + return v->shared_ptr; +} +EXPORT_SYMBOL(vpe_get_shared); + +int vpe_notify(int index, struct vpe_notifications *notify) +{ + struct vpe *v = get_vpe(index); + + if (v == NULL) + return -1; + + list_add(¬ify->list, &v->notify); + return 0; +} +EXPORT_SYMBOL(vpe_notify); + +module_init(vpe_module_init); +module_exit(vpe_module_exit); +MODULE_DESCRIPTION("MIPS VPE Loader"); +MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc."); +MODULE_LICENSE("GPL"); |