040362e379
. make exec() callers (i.e. vfs and rs) determine the memory layout by explicitly reserving regions using mmap() calls on behalf of the exec()ing process, i.e. handling all of the exec logic, thereby eliminating all special exec() knowledge from VM. . the new procedure is: clear the exec()ing process first, then call third-party mmap()s to reserve memory, then copy the executable file section contents in, all using callbacks tailored to the caller's way of starting an executable . i.e. no more explicit EXEC_NEWMEM-style calls in PM or VM as with rigid 2-section arguments . this naturally allows generalizing exec() by simply loading all ELF sections . drop/merge of lots of duplicate exec() code into libexec . not copying the code sections to vfs and into the executable again is a measurable performance improvement (about 3.3% faster for 'make' in src/servers/)
52 lines
2 KiB
C
52 lines
2 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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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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libexec_loadfunc_t load; /* Load callback */
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libexec_clearfunc_t clear; /* Clear callback */
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void *opaque; /* Callback data */
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vir_bytes stack_size; /* Desired stack size */
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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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int read_header_elf(char *exec_hdr, int hdr_len,
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vir_bytes *text_vaddr, phys_bytes *text_paddr,
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vir_bytes *text_filebytes, vir_bytes *text_membytes,
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vir_bytes *data_vaddr, phys_bytes *data_paddr,
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vir_bytes *data_filebytes, vir_bytes *data_membytes,
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vir_bytes *pc, off_t *text_offset, off_t *data_offset);
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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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#endif /* !_LIBEXEC_H_ */
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