mirror of
https://github.com/Motorhead1991/qemu.git
synced 2025-09-09 00:07:57 -06:00
bFLT loader (for uClinux binaries).
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1951 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
pbrook
parent
ac62f715c6
commit
e5fe0c5230
8 changed files with 1147 additions and 272 deletions
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@ -3,7 +3,6 @@
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#include <stdio.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/mman.h>
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@ -59,19 +58,19 @@ static uint32_t get_elf_hwcap(void)
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#define ELF_DATA ELFDATA2LSB
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#define ELF_ARCH EM_386
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/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
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starts %edx contains a pointer to a function which might be
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registered using `atexit'. This provides a mean for the
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dynamic linker to call DT_FINI functions for shared libraries
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that have been loaded before the code runs.
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A value of 0 tells we have no such handler. */
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#define ELF_PLAT_INIT(_r) _r->edx = 0
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static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
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{
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regs->esp = infop->start_stack;
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regs->eip = infop->entry;
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/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
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starts %edx contains a pointer to a function which might be
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registered using `atexit'. This provides a mean for the
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dynamic linker to call DT_FINI functions for shared libraries
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that have been loaded before the code runs.
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A value of 0 tells we have no such handler. */
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regs->edx = 0;
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}
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#define USE_ELF_CORE_DUMP
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@ -93,8 +92,6 @@ static inline void init_thread(struct target_pt_regs *regs, struct image_info *i
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#endif
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#define ELF_ARCH EM_ARM
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#define ELF_PLAT_INIT(_r) _r->ARM_r0 = 0
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static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
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{
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target_long stack = infop->start_stack;
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@ -107,7 +104,9 @@ static inline void init_thread(struct target_pt_regs *regs, struct image_info *i
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regs->ARM_r2 = tgetl(stack + 8); /* envp */
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regs->ARM_r1 = tgetl(stack + 4); /* envp */
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/* XXX: it seems that r0 is zeroed after ! */
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// regs->ARM_r0 = tgetl(stack); /* argc */
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regs->ARM_r0 = 0;
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/* For uClinux PIC binaries. */
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regs->ARM_r10 = infop->start_data;
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}
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#define USE_ELF_CORE_DUMP
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@ -142,9 +141,6 @@ enum
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#define ELF_DATA ELFDATA2MSB
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#define ELF_ARCH EM_SPARC
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/*XXX*/
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#define ELF_PLAT_INIT(_r)
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static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
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{
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regs->tstate = 0;
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@ -163,9 +159,6 @@ static inline void init_thread(struct target_pt_regs *regs, struct image_info *i
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#define ELF_DATA ELFDATA2MSB
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#define ELF_ARCH EM_SPARC
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/*XXX*/
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#define ELF_PLAT_INIT(_r)
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static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
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{
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regs->psr = 0;
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@ -192,20 +185,6 @@ static inline void init_thread(struct target_pt_regs *regs, struct image_info *i
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#endif
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#define ELF_ARCH EM_PPC
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/* Note that isn't exactly what regular kernel does
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* but this is what the ABI wants and is needed to allow
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* execution of PPC BSD programs.
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*/
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#define ELF_PLAT_INIT(_r) \
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do { \
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target_ulong *pos = (target_ulong *)bprm->p, tmp = 1; \
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_r->gpr[3] = bprm->argc; \
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_r->gpr[4] = (unsigned long)++pos; \
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for (; tmp != 0; pos++) \
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tmp = ldl(pos); \
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_r->gpr[5] = (unsigned long)pos; \
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} while (0)
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/*
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* We need to put in some extra aux table entries to tell glibc what
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* the cache block size is, so it can use the dcbz instruction safely.
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@ -239,9 +218,22 @@ do { \
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static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop)
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{
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target_ulong pos = infop->start_stack;
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target_ulong tmp;
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_regs->msr = 1 << MSR_PR; /* Set user mode */
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_regs->gpr[1] = infop->start_stack;
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_regs->nip = infop->entry;
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/* Note that isn't exactly what regular kernel does
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* but this is what the ABI wants and is needed to allow
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* execution of PPC BSD programs.
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*/
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_regs->gpr[3] = tgetl(pos);
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pos += sizeof(target_ulong);
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_regs->gpr[4] = pos;
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for (tmp = 1; tmp != 0; pos += sizeof(target_ulong))
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tmp = ldl(pos);
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_regs->gpr[5] = pos;
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}
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#define USE_ELF_CORE_DUMP
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@ -263,8 +255,6 @@ static inline void init_thread(struct target_pt_regs *_regs, struct image_info *
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#endif
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#define ELF_ARCH EM_MIPS
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#define ELF_PLAT_INIT(_r)
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static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
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{
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regs->cp0_status = CP0St_UM;
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@ -284,8 +274,6 @@ static inline void init_thread(struct target_pt_regs *regs, struct image_info *i
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#define ELF_DATA ELFDATA2LSB
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#define ELF_ARCH EM_SH
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#define ELF_PLAT_INIT(_r) /* XXXXX */
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static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
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{
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/* Check other registers XXXXX */
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@ -308,30 +296,6 @@ static inline void init_thread(struct target_pt_regs *regs, struct image_info *i
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#include "elf.h"
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/*
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* MAX_ARG_PAGES defines the number of pages allocated for arguments
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* and envelope for the new program. 32 should suffice, this gives
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* a maximum env+arg of 128kB w/4KB pages!
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*/
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#define MAX_ARG_PAGES 32
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/*
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* This structure is used to hold the arguments that are
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* used when loading binaries.
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*/
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struct linux_binprm {
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char buf[128];
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void *page[MAX_ARG_PAGES];
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unsigned long p;
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int sh_bang;
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int fd;
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int e_uid, e_gid;
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int argc, envc;
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char * filename; /* Name of binary */
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unsigned long loader, exec;
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int dont_iput; /* binfmt handler has put inode */
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};
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struct exec
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{
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unsigned int a_info; /* Use macros N_MAGIC, etc for access */
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@ -377,8 +341,6 @@ struct exec
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#define PER_XENIX (0x0007 | STICKY_TIMEOUTS)
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/* Necessary parameters */
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#define NGROUPS 32
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#define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
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#define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1))
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#define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1))
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@ -452,13 +414,13 @@ static void bswap_sym(Elf32_Sym *sym)
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#endif
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/*
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* 'copy_string()' copies argument/envelope strings from user
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* 'copy_elf_strings()' copies argument/envelope strings from user
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* memory to free pages in kernel mem. These are in a format ready
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* to be put directly into the top of new user memory.
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*
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*/
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static unsigned long copy_strings(int argc,char ** argv, void **page,
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unsigned long p)
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static unsigned long copy_elf_strings(int argc,char ** argv, void **page,
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unsigned long p)
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{
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char *tmp, *tmp1, *pag = NULL;
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int len, offset = 0;
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@ -506,101 +468,6 @@ static unsigned long copy_strings(int argc,char ** argv, void **page,
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return p;
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}
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static int in_group_p(gid_t g)
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{
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/* return TRUE if we're in the specified group, FALSE otherwise */
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int ngroup;
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int i;
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gid_t grouplist[NGROUPS];
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ngroup = getgroups(NGROUPS, grouplist);
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for(i = 0; i < ngroup; i++) {
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if(grouplist[i] == g) {
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return 1;
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}
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}
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return 0;
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}
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static int count(char ** vec)
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{
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int i;
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for(i = 0; *vec; i++) {
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vec++;
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}
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return(i);
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}
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static int prepare_binprm(struct linux_binprm *bprm)
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{
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struct stat st;
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int mode;
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int retval, id_change;
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if(fstat(bprm->fd, &st) < 0) {
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return(-errno);
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}
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mode = st.st_mode;
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if(!S_ISREG(mode)) { /* Must be regular file */
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return(-EACCES);
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}
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if(!(mode & 0111)) { /* Must have at least one execute bit set */
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return(-EACCES);
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}
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bprm->e_uid = geteuid();
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bprm->e_gid = getegid();
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id_change = 0;
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/* Set-uid? */
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if(mode & S_ISUID) {
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bprm->e_uid = st.st_uid;
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if(bprm->e_uid != geteuid()) {
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id_change = 1;
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}
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}
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/* Set-gid? */
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/*
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* If setgid is set but no group execute bit then this
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* is a candidate for mandatory locking, not a setgid
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* executable.
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*/
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if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
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bprm->e_gid = st.st_gid;
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if (!in_group_p(bprm->e_gid)) {
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id_change = 1;
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}
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}
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memset(bprm->buf, 0, sizeof(bprm->buf));
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retval = lseek(bprm->fd, 0L, SEEK_SET);
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if(retval >= 0) {
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retval = read(bprm->fd, bprm->buf, 128);
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}
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if(retval < 0) {
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perror("prepare_binprm");
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exit(-1);
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/* return(-errno); */
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}
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else {
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return(retval);
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}
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}
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static inline void memcpy_to_target(target_ulong dest, const void *src,
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unsigned long len)
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{
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void *host_ptr;
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host_ptr = lock_user(dest, len, 0);
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memcpy(host_ptr, src, len);
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unlock_user(host_ptr, dest, 1);
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}
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unsigned long setup_arg_pages(target_ulong p, struct linux_binprm * bprm,
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struct image_info * info)
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{
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@ -628,11 +495,6 @@ unsigned long setup_arg_pages(target_ulong p, struct linux_binprm * bprm,
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stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE;
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p += stack_base;
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if (bprm->loader) {
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bprm->loader += stack_base;
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}
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bprm->exec += stack_base;
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for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
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if (bprm->page[i]) {
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info->rss++;
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@ -703,7 +565,6 @@ static unsigned long create_elf_tables(target_ulong p, int argc, int envc,
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unsigned long interp_load_addr, int ibcs,
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struct image_info *info)
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{
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target_ulong argv, envp;
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target_ulong sp;
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int size;
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target_ulong u_platform;
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@ -765,28 +626,7 @@ static unsigned long create_elf_tables(target_ulong p, int argc, int envc,
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#endif
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#undef NEW_AUX_ENT
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sp -= (envc + 1) * n;
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envp = sp;
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sp -= (argc + 1) * n;
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argv = sp;
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if (!ibcs) {
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sp -= n; tputl(sp, envp);
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sp -= n; tputl(sp, argv);
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}
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sp -= n; tputl(sp, argc);
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info->arg_start = p;
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while (argc-->0) {
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tputl(argv, p); argv += n;
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p += target_strlen(p) + 1;
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}
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tputl(argv, 0);
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info->arg_end = info->env_start = p;
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while (envc-->0) {
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tputl(envp, p); envp += n;
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p += target_strlen(p) + 1;
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}
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tputl(envp, 0);
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info->env_end = p;
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sp = loader_build_argptr(envc, argc, sp, p, !ibcs);
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return sp;
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}
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@ -1001,8 +841,8 @@ static void load_symbols(struct elfhdr *hdr, int fd)
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syminfos = s;
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}
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static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
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struct image_info * info)
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int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
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struct image_info * info)
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{
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struct elfhdr elf_ex;
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struct elfhdr interp_elf_ex;
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@ -1034,17 +874,19 @@ static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * r
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bswap_ehdr(&elf_ex);
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#endif
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if (elf_ex.e_ident[0] != 0x7f ||
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strncmp(&elf_ex.e_ident[1], "ELF",3) != 0) {
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return -ENOEXEC;
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}
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/* First of all, some simple consistency checks */
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if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
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(! elf_check_arch(elf_ex.e_machine))) {
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return -ENOEXEC;
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}
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bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p);
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bprm->p = copy_elf_strings(bprm->envc,bprm->envp,bprm->page,bprm->p);
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bprm->p = copy_elf_strings(bprm->argc,bprm->argv,bprm->page,bprm->p);
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if (!bprm->p) {
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retval = -E2BIG;
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}
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/* Now read in all of the header information */
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elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum);
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if (elf_phdata == NULL) {
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@ -1188,7 +1030,7 @@ static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * r
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/* OK, we are done with that, now set up the arg stuff,
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and then start this sucker up */
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if (!bprm->sh_bang) {
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{
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char * passed_p;
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if (interpreter_type == INTERPRETER_AOUT) {
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@ -1196,7 +1038,7 @@ static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * r
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passed_p = passed_fileno;
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if (elf_interpreter) {
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bprm->p = copy_strings(1,&passed_p,bprm->page,bprm->p);
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bprm->p = copy_elf_strings(1,&passed_p,bprm->page,bprm->p);
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bprm->argc++;
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}
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}
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@ -1347,11 +1189,10 @@ static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * r
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interp_load_addr,
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(interpreter_type == INTERPRETER_AOUT ? 0 : 1),
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info);
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if (interpreter_type == INTERPRETER_AOUT)
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info->arg_start += strlen(passed_fileno) + 1;
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info->start_brk = info->brk = elf_brk;
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info->end_code = end_code;
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info->start_code = start_code;
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info->start_data = end_code;
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info->end_data = end_data;
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info->start_stack = bprm->p;
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@ -1380,79 +1221,18 @@ static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * r
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MAP_FIXED | MAP_PRIVATE, -1, 0);
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}
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#ifdef ELF_PLAT_INIT
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/*
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* The ABI may specify that certain registers be set up in special
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* ways (on i386 %edx is the address of a DT_FINI function, for
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* example. This macro performs whatever initialization to
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* the regs structure is required.
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*/
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ELF_PLAT_INIT(regs);
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#endif
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info->entry = elf_entry;
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return 0;
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}
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int elf_exec(const char * filename, char ** argv, char ** envp,
|
||||
struct target_pt_regs * regs, struct image_info *infop)
|
||||
{
|
||||
struct linux_binprm bprm;
|
||||
int retval;
|
||||
int i;
|
||||
|
||||
bprm.p = TARGET_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int);
|
||||
for (i=0 ; i<MAX_ARG_PAGES ; i++) /* clear page-table */
|
||||
bprm.page[i] = 0;
|
||||
retval = open(filename, O_RDONLY);
|
||||
if (retval < 0)
|
||||
return retval;
|
||||
bprm.fd = retval;
|
||||
bprm.filename = (char *)filename;
|
||||
bprm.sh_bang = 0;
|
||||
bprm.loader = 0;
|
||||
bprm.exec = 0;
|
||||
bprm.dont_iput = 0;
|
||||
bprm.argc = count(argv);
|
||||
bprm.envc = count(envp);
|
||||
|
||||
retval = prepare_binprm(&bprm);
|
||||
|
||||
if(retval>=0) {
|
||||
bprm.p = copy_strings(1, &bprm.filename, bprm.page, bprm.p);
|
||||
bprm.exec = bprm.p;
|
||||
bprm.p = copy_strings(bprm.envc,envp,bprm.page,bprm.p);
|
||||
bprm.p = copy_strings(bprm.argc,argv,bprm.page,bprm.p);
|
||||
if (!bprm.p) {
|
||||
retval = -E2BIG;
|
||||
}
|
||||
}
|
||||
|
||||
if(retval>=0) {
|
||||
retval = load_elf_binary(&bprm,regs,infop);
|
||||
}
|
||||
|
||||
if(retval>=0) {
|
||||
/* success. Initialize important registers */
|
||||
init_thread(regs, infop);
|
||||
return retval;
|
||||
}
|
||||
|
||||
/* Something went wrong, return the inode and free the argument pages*/
|
||||
for (i=0 ; i<MAX_ARG_PAGES ; i++) {
|
||||
free(bprm.page[i]);
|
||||
}
|
||||
return(retval);
|
||||
}
|
||||
|
||||
|
||||
static int load_aout_interp(void * exptr, int interp_fd)
|
||||
{
|
||||
printf("a.out interpreter not yet supported\n");
|
||||
return(0);
|
||||
}
|
||||
|
||||
void do_init_thread(struct target_pt_regs *regs, struct image_info *infop)
|
||||
{
|
||||
init_thread(regs, infop);
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue