Initial changes for execve() support

tasks/mm0/include/file.h

@@ -16,6 +16,8 @@ int sys_lseek(struct tcb *sender, int fd, off_t offset, int whence);
 int sys_close(struct tcb *sender, int fd);
 int sys_fsync(struct tcb *sender, int fd);
 int file_open(struct tcb *opener, int fd);
+
+struct vm_file *do_open2(struct tcb *task, int fd, unsigned long vnum, unsigned long length);
 int flush_file_pages(struct vm_file *f);
 
 struct vfs_file_data {

tasks/mm0/include/lib/elf.h

@@ -0,0 +1,61 @@
+/*
+ * Definitions for Executable Linking Format
+ * Based on Portable Formats Specification v1.1
+ *
+ * Copyright (C) 2008 Bahadir Balban
+ */
+
+#ifndef __ELF_H__
+#define __ELF_H__
+
+#include <l4/types.h>
+
+/* ELF identification indices */
+#define EI_MAG0		0
+#define EI_MAG1		1
+#define EI_MAG2		2
+#define EI_MAG3		3
+#define EI_CLASS	4
+#define EI_DATA		5
+#define EI_VERSION	6
+#define EI_PAD		7
+
+/* Size of ELF identification field */
+#define EI_NIDENT	16
+
+/* Values for ELF identification fields */
+#define ELFMAG0		0x7f
+#define ELFMAG1		'E'
+#define ELFMAG2		'L'
+#define ELFMAG3		'F'
+
+/* Values for the ELF Class field */
+#define ELFCLASSNONE	0
+#define ELFCLASS32	1
+#define ELFCLASS64	2
+
+/* Values for the ELF Data field */
+#define ELFDATANONE	0
+#define ELFDATA2LSB	1
+#define ELFDATA2MSB	2
+
+
+struct elf_header {
+	u8 	e_ident[EI_NIDENT];	/* ELF identification */
+	u16	e_type;			/* Object file type */
+	u16	e_machine;		/* Machine architecture */
+	u32	e_version;		/* Object file version */
+	u32	e_entry;		/* Virtual entry address */
+	u32	e_phoff;		/* Program header offset */
+	u32	e_shoff;		/* Section header offset */
+	u32	e_flags;		/* Processor specific flags */
+	u16	e_ehsize;		/* ELF header size */
+	u16	e_phentsize;		/* Program header entry size */
+	u16	e_phnum;		/* Number of program headers */
+	u16	e_shentsize;		/* Section header entry size */
+	u16	e_shnum;		/* Number of section headers */
+	u16	e_shstrndx;		/* Shtable index for strings */
+} __attribute__((__packed__));
+
+
+#endif /* __ELF_H__ */

tasks/mm0/include/lib/elfsect.h

@@ -0,0 +1,60 @@
+/*
+ * Definitions for ELF Sections
+ * Based on Portable Formats Specification v1.1
+ *
+ * Copyright (C) 2008 Bahadir Balban
+ */
+
+#ifndef __ELFSECT_H__
+#define __ELFSECT_H__
+
+#include <l4/types.h>
+
+/* Special section indices */
+#define SHN_UNDEF			0
+#define SHN_LORESERVE			0xFF00
+#define SHN_LOPROC			0xFF00
+#define SHN_HIPROC			0xFF1F
+#define SHN_ABS				0xFFF1
+#define SHN_COMMON			0xFFF2
+#define SHN_HIRESERVE			0xFFFF
+
+
+struct elf_section_header {
+	u32	sh_name;	/* Index to section header str table for name */
+	u32	sh_type;	/* Categorises section's semantics */
+	u32	sh_flags;	/* Flags that define various attributes */
+	u32	sh_addr;	/* Virtual address for section */
+	u32	sh_offset;	/* Offset to contents from file beginning */
+	u32	sh_size;	/* Size of section (note SHT_NOBITS) */
+	u32	sh_link;
+	u32	sh_info;	/* Extra section info */
+	u32	sh_addralign;	/* Section alignment in power of 2 */
+	u32	sh_entsize;	/* Size of each entry if fixed */
+} __attribute__((__packed__));
+
+/* Section type codes */
+#define SHT_NULL			0	/* Inactive */
+#define SHT_PROGBITS			1	/* Program contents */
+#define SHT_SYMTAB			2	/* Symbol table */
+#define SHT_STRTAB			3	/* String table */
+#define SHT_RELA			4	/* Relocation entries */
+#define SHT_HASH			5	/* Symbol hash table */
+#define SHT_DYNAMIC			6	/* Dynamic linking info */
+#define SHT_NOTE			7	/* Optional, additional info */
+#define SHT_NOBITS			8	/* Does not occupy file space */
+#define SHT_REL				9	/* Relocation entries */
+#define SHT_SHLIB			10	/* Reserved */
+#define SHT_DYNSYM			11	/* Symbols for dynamic linking */
+#define SHT_LOPROC		0x70000000	/* Reserved for processors */
+#define SHT_HIPROC		0x7FFFFFFF	/* Reserved for processors */
+#define SHT_LOUSER		0x80000000	/* Reserved for user progs */
+#define SHT_HIUSER		0xFFFFFFFF	/* Reserved for user progs */
+
+/* Section attribute flags */
+#define SHF_WRITE		(1 << 0)	/* Writeable */
+#define SHF_ALLOC		(1 << 1)	/* Occupies actual memory */
+#define SHF_EXECINSTR		(1 << 2)	/* Executable */
+#define SHF_MASCPROC		0xF0000000	/* Reserved for processors */
+
+#endif /* __ELFSECT_H__ */

tasks/mm0/include/lib/elfsym.h

@@ -0,0 +1,59 @@
+/*
+ * Definitions for ELF Symbol tables, symbols
+ * Based on Portable Formats Specification v1.1
+ *
+ * Copyright (C) 2008 Bahadir Balban
+ */
+#ifndef __ELFSYM_H__
+#define __ELFSYM_H__
+
+#include <l4/types.h>
+
+struct elf_symbol_entry {
+	u32	st_name;	/* Index into string table */
+	u32	st_value;	/* Symbol value; address, aboslute etc. */
+	u32	st_size;	/* Number of bytes contained in object */
+	u8	st_info;	/* Type and binding attributes */
+	u8	st_other;	/* Unused, 0 */
+	u16	st_shndx;	/* Section header index associated with entry */
+} __attribute__((__packed__));
+
+/* To manipulate binding and type attributes on st_info field */
+#define ELF32_ST_BIND(i)	((i) >> 4)
+#define ELF32_ST_TYPE(i)	((i) & 0xF)
+#define ELF32_ST_INFO(b, t)	(((b) << 4) + ((t) & 0xF))
+
+/* Symbol binding codes */
+#define STB_LOCAL		0
+#define STB_GLOBAL		1
+#define STB_WEAK		2
+#define STB_LOPROC		13
+#define STB_HIPROC		15
+
+/* Symbol types */
+#define STT_NOTYPE		0
+#define STT_OBJECT		1
+#define STT_FUNC		2
+#define STT_SECTION		3
+#define STT_FILE		4
+#define STT_LOPROC		13
+#define STT_HIPROC		15
+
+/* Relocation structures */
+struct elf_rel {
+	u32	r_offset;
+	u32	r_info;
+} __attribute__((__packed__));
+
+struct elf_rela {
+	u32	r_offset;
+	u32	r_info;
+	s32	r_addend;
+} __attribute__((__packed__));
+
+/* Macros to manipulate r_info field */
+#define ELF32_R_SYM(i)			((i) >> 8)
+#define ELF32_R_TYPE(i)			((u8)(i))
+#define ELF32_R_INFO(s,t)		(((s) << 8) + (u8)(t))
+
+#endif /* __ELFSYM_H__ */

tasks/mm0/include/syscalls.h

@@ -31,6 +31,7 @@ int sys_shmdt(struct tcb *requester, const void *shmaddr);
 
 int sys_shmget(key_t key, int size, int shmflg);
 
+int sys_execve(struct tcb *sender, char *pathname, char *argv[], char *envp[]);
 int sys_fork(struct tcb *parent);
 int sys_clone(struct tcb *parent, void *child_stack, unsigned int clone_flags);
 void sys_exit(struct tcb *task, int status);

tasks/mm0/include/task.h

@@ -17,6 +17,9 @@
 
 #define __TASKNAME__			__PAGERNAME__
 
+#define ARGS_MAX			DEFAULT_ENV_SIZE
+#define PATH_MAX			PAGE_SIZE
+
 #define TASK_FILES_MAX			32
 
 /* POSIX minimum is 4Kb */