populate ELF header information on the initial stack so that glibc can set up TLS properly

kernel/host.c

@@ -254,7 +254,7 @@ static void process_msg_prepare_process(unsigned long rphys)
 	dkprintf("env OK\n");
 
 	p->rprocess = (unsigned long)proc;
-	init_process_stack(proc, argc, argv, envc, env);
+	init_process_stack(proc, pn, argc, argv, envc, env);
 
 	dkprintf("new process : %p [%d] / table : %p\n", proc, proc->pid,
 	        proc->vm->page_table);

kernel/include/auxvec.h

@@ -0,0 +1,33 @@
+#ifndef _LINUX_AUXVEC_H
+#define _LINUX_AUXVEC_H
+
+/* Symbolic values for the entries in the auxiliary table
+   put on the initial stack */
+#define AT_NULL   0	/* end of vector */
+#define AT_IGNORE 1	/* entry should be ignored */
+#define AT_EXECFD 2	/* file descriptor of program */
+#define AT_PHDR   3	/* program headers for program */
+#define AT_PHENT  4	/* size of program header entry */
+#define AT_PHNUM  5	/* number of program headers */
+#define AT_PAGESZ 6	/* system page size */
+#define AT_BASE   7	/* base address of interpreter */
+#define AT_FLAGS  8	/* flags */
+#define AT_ENTRY  9	/* entry point of program */
+#define AT_NOTELF 10	/* program is not ELF */
+#define AT_UID    11	/* real uid */
+#define AT_EUID   12	/* effective uid */
+#define AT_GID    13	/* real gid */
+#define AT_EGID   14	/* effective gid */
+#define AT_PLATFORM 15  /* string identifying CPU for optimizations */
+#define AT_HWCAP  16    /* arch dependent hints at CPU capabilities */
+#define AT_CLKTCK 17	/* frequency at which times() increments */
+/* AT_* values 18 through 22 are reserved */
+#define AT_SECURE 23   /* secure mode boolean */
+#define AT_BASE_PLATFORM 24	/* string identifying real platform, may
+				 * differ from AT_PLATFORM. */
+#define AT_RANDOM 25	/* address of 16 random bytes */
+
+#define AT_EXECFN  31	/* filename of program */
+
+
+#endif /* _LINUX_AUXVEC_H */

kernel/include/process.h

@@ -86,7 +86,9 @@ int add_process_large_range(struct process *process,
                             unsigned long flag, unsigned long *phys);
 int remove_process_region(struct process *proc,
                           unsigned long start, unsigned long end);
-void init_process_stack(struct process *process, int argc, char **argv, 
+struct program_load_desc;
+void init_process_stack(struct process *process, struct program_load_desc *pn,
+                        int argc, char **argv, 
                         int envc, char **env);
 unsigned long extend_process_region(struct process *proc,
                                     unsigned long start, unsigned long end,

kernel/include/syscall.h

@@ -90,6 +90,9 @@ struct program_load_desc {
 	int pid;
 	unsigned long entry;
 	unsigned long rprocess;
+	unsigned long at_phdr;
+	unsigned long at_phent;
+	unsigned long at_phnum;
 	char *args;
 	unsigned long args_len;
 	char *envs;

kernel/process.c

@@ -6,6 +6,7 @@
 #include <aal/debug.h>
 #include <page.h>
 #include <cpulocal.h>
+#include <auxvec.h>
 
 #define DEBUG_PRINT_PROCESS
 
@@ -199,7 +200,8 @@ int add_process_memory_range(struct process *process,
 
 
 
-void init_process_stack(struct process *process, int argc, char **argv, 
+void init_process_stack(struct process *process, struct program_load_desc *pn,
+                        int argc, char **argv, 
                         int envc, char **env)
 {
 	int s_ind = 0;
@@ -215,11 +217,16 @@ void init_process_stack(struct process *process, int argc, char **argv,
 	                         USER_END,
 	                         virt_to_phys(stack), VR_STACK);
 
-	p[-1] = 0;     /* AT_NULL */
+	s_ind = -1;
-	p[-2] = 0;
+	p[s_ind--] = 0;     /* AT_NULL */
-	p[-3] = USER_END - sizeof(unsigned long) * 2;
+	p[s_ind--] = 0;
-	p[-4] = 0;     /* envp terminating NULL */
+	p[s_ind--] = pn->at_phnum; /* AT_PHNUM */
-	s_ind = -5;
+	p[s_ind--] = AT_PHNUM;
+	p[s_ind--] = pn->at_phent;  /* AT_PHENT */
+	p[s_ind--] = AT_PHENT;
+	p[s_ind--] = pn->at_phdr;  /* AT_PHDR */
+	p[s_ind--] = AT_PHDR;	
+	p[s_ind--] = 0;     /* envp terminating NULL */
 	/* envp */
 	for (arg_ind = envc - 1; arg_ind > -1; --arg_ind) {
 		p[s_ind--] = (unsigned long)env[arg_ind];

linux/executer/mcexec.c

@@ -60,6 +60,8 @@ struct program_load_desc *load_elf(FILE *fp)
 	Elf64_Phdr phdr;
 	int i, j, nhdrs = 0;
 	struct program_load_desc *desc;
+	unsigned long load_addr = 0;
+	int load_addr_set = 0;
 
 	if (fread(&hdr, sizeof(hdr), 1, fp) < 1) {
 		__eprint("Cannot read Ehdr.\n");
@@ -103,11 +105,20 @@ struct program_load_desc *load_elf(FILE *fp)
 			          desc->sections[j].offset,
 			          desc->sections[j].len);
 			j++;
+
+			if (!load_addr_set) {
+				load_addr_set = 1;
+				load_addr = phdr.p_vaddr - phdr.p_offset;
+			}
 		}
 	}
 	desc->pid = getpid();
 	desc->entry = hdr.e_entry;
 
+	desc->at_phdr = load_addr + hdr.e_phoff;
+	desc->at_phent = sizeof(phdr);
+	desc->at_phnum = hdr.e_phnum;
+
 	return desc;
 }
 

linux/include/uprotocol.h

@@ -31,6 +31,9 @@ struct program_load_desc {
 	int pid;
 	unsigned long entry;
 	unsigned long rprocess;
+	unsigned long at_phdr;
+	unsigned long at_phent;
+	unsigned long at_phnum;
 	char *args;
 	unsigned long args_len;
 	char *envs;