0cfff08e56
In libexec, split the memory allocation method into cleared and non-cleared. Cleared gives zeroed memory, non-cleared gives 'junk' memory (that will be overwritten anyway, and so needn't be cleared) that is faster to get. Also introduce the 'memmap' method that can be used, if available, to map code and data from executables into a process using the third-party mmap() mode. Change-Id: I26694fd3c21deb8b97e01ed675dfc14719b0672b
71 lines
3 KiB
C
71 lines
3 KiB
C
#ifndef _LIBEXEC_H_
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#define _LIBEXEC_H_ 1
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#include <sys/exec_elf.h>
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struct exec_info;
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typedef int (*libexec_loadfunc_t)(struct exec_info *execi,
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off_t offset, off_t vaddr, size_t len);
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typedef int (*libexec_clearfunc_t)(struct exec_info *execi,
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off_t vaddr, size_t len);
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typedef int (*libexec_allocfunc_t)(struct exec_info *execi,
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off_t vaddr, size_t len);
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typedef int (*libexec_procclearfunc_t)(struct exec_info *execi);
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typedef int (*libexec_mmap_t)(struct exec_info *execi,
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vir_bytes vaddr, vir_bytes len, vir_bytes foffset, u16_t clearend,
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int protflags);
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struct exec_info {
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/* Filled in by libexec caller */
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endpoint_t proc_e; /* Process endpoint */
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char *hdr; /* Header or full image */
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size_t hdr_len; /* Size of hdr */
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vir_bytes frame_len; /* Stack size */
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char progname[PROC_NAME_LEN]; /* Program name */
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uid_t new_uid; /* Process UID after exec */
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gid_t new_gid; /* Process GID after exec */
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int allow_setuid; /* Allow set{u,g}id execution? */
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vir_bytes stack_size; /* Desired stack size */
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vir_bytes load_offset; /* Desired load offset */
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off_t filesize; /* How big is the file */
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/* Callback pointers for use by libexec */
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libexec_loadfunc_t copymem; /* Copy callback */
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libexec_clearfunc_t clearmem; /* Clear callback */
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libexec_allocfunc_t allocmem_prealloc_cleared; /* Alloc callback */
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libexec_allocfunc_t allocmem_prealloc_junk; /* Alloc callback */
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libexec_allocfunc_t allocmem_ondemand; /* Alloc callback */
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libexec_procclearfunc_t clearproc; /* Clear process callback */
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libexec_mmap_t memmap; /* mmap callback */
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void *opaque; /* Callback data */
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/* Filled in by libexec load function */
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vir_bytes load_base; /* Where executable is loaded */
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vir_bytes pc; /* Entry point of exec file */
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vir_bytes stack_high; /* High stack addr */
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};
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int elf_has_interpreter(char *exec_hdr, int hdr_len, char *interp, int maxsz);
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int elf_phdr(char *exec_hdr, int hdr_len, vir_bytes *phdr);
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void libexec_patch_ptr(char stack[ARG_MAX], vir_bytes base);
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int libexec_pm_newexec(endpoint_t proc_e, struct exec_info *execi);
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typedef int (*libexec_exec_loadfunc_t)(struct exec_info *execi);
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int libexec_load_elf(struct exec_info *execi);
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int libexec_copy_memcpy(struct exec_info *execi, off_t offset, off_t vaddr, size_t len);
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int libexec_clear_memset(struct exec_info *execi, off_t vaddr, size_t len);
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int libexec_alloc_mmap_prealloc_cleared(struct exec_info *execi, off_t vaddr, size_t len);
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int libexec_alloc_mmap_prealloc_junk(struct exec_info *execi, off_t vaddr, size_t len);
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int libexec_alloc_mmap_ondemand(struct exec_info *execi, off_t vaddr, size_t len);
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int libexec_clearproc_vm_procctl(struct exec_info *execi);
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int libexec_clear_sys_memset(struct exec_info *execi, off_t vaddr, size_t len);
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#endif /* !_LIBEXEC_H_ */
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