more elf64 support: phdrs, constants

R=rsc
DELTA=130  (68 added, 6 deleted, 56 changed)
OCL=31798
CL=31798

src/cmd/6l/asm.c

@@ -127,6 +127,7 @@ asmb(void)
 	vlong vl, va, fo, w, symo;
 	int strtabsize;
 	vlong symdatva = 0x99LL<<32;
+	Elf64PHdr *ph;
 	Elf64SHdr *sh;
 
 	strtabsize = 0;
@@ -450,47 +451,49 @@ asmb(void)
 		va = INITTEXT & ~((vlong)INITRND - 1);
 		w = HEADR+textsize;
 
-		elf64phdr(1,			/* text - type = PT_LOAD */
-			1L+4L,			/* text - flags = PF_X+PF_R */
-			0,			/* file offset */
-			va,			/* vaddr */
-			va,			/* paddr */
-			w,			/* file size */
-			w,			/* memory size */
-			INITRND);		/* alignment */
+		ph = newElf64PHdr();
+		ph->type = PT_LOAD; 	
+		ph->flags = PF_X+PF_R;
+		ph->vaddr = va;
+		ph->paddr = va;
+		ph->filesz = w;
+		ph->memsz = w;
+		ph->align = INITRND;
+		elf64phdr(ph);
 
 		fo = rnd(fo+w, INITRND);
 		va = rnd(va+w, INITRND);
 		w = datsize;
 
-		elf64phdr(1,			/* data - type = PT_LOAD */
-			2L+4L,			/* data - flags = PF_W+PF_R */
-			fo,			/* file offset */
-			va,			/* vaddr */
-			va,			/* paddr */
-			w,			/* file size */
-			w+bsssize,		/* memory size */
-			INITRND);		/* alignment */
+		ph = newElf64PHdr();
+		ph->type = PT_LOAD;
+		ph->flags = PF_W+PF_R;
+		ph->off = fo;
+		ph->vaddr = va;
+		ph->paddr = va;
+		ph->filesz = w;
+		ph->memsz = w+bsssize;
+		ph->align = INITRND;
+		elf64phdr(ph);
 
 		if(!debug['s']) {
-			elf64phdr(1,			/* data - type = PT_LOAD */
-				2L+4L,			/* data - flags = PF_W+PF_R */
-				symo,		/* file offset */
-				symdatva,			/* vaddr */
-				symdatva,			/* paddr */
-				8+symsize+lcsize,			/* file size */
-				8+symsize+lcsize,		/* memory size */
-				INITRND);		/* alignment */
-		}
-
-		elf64phdr(0x6474e551,		/* gok - type = gok */
-			1L+2L+4L,		/* gok - flags = PF_X+PF_W+PF_R */
-			0,			/* file offset */
-			0,			/* vaddr */
-			0,			/* paddr */
-			0,			/* file size */
-			0,			/* memory size */
-			8);			/* alignment */
+			ph = newElf64PHdr();
+			ph->type = PT_LOAD;
+			ph->flags = PF_W+PF_R;
+			ph->off = symo;
+			ph->vaddr = symdatva;
+			ph->paddr = symdatva;
+			ph->filesz = 8+symsize+lcsize;
+			ph->memsz = 8+symsize+lcsize;
+			ph->align = INITRND;
+			elf64phdr(ph);
+		}
+
+		ph = newElf64PHdr();
+		ph->type = 0x6474e551; 	/* gok */
+		ph->flags = PF_X+PF_W+PF_R;
+		ph->align = 8;
+		elf64phdr(ph);
 
 		sh = newElf64SHdr();
 		elf64shdr(nil, sh);
@@ -501,8 +504,8 @@ asmb(void)
 		w = textsize;
 
 		sh = newElf64SHdr();
-		sh->type = 1;
-		sh->flags = 6;
+		sh->type = SHT_PROGBITS;
+		sh->flags = SHF_ALLOC+SHF_EXECINSTR;
 		sh->addr = va;
 		sh->off = fo;
 		sh->size = w;
@@ -514,8 +517,8 @@ asmb(void)
 		w = datsize;
 
 		sh = newElf64SHdr();
-		sh->type = 1;
-		sh->flags = 3;
+		sh->type = SHT_PROGBITS;
+		sh->flags = SHF_WRITE+SHF_ALLOC;
 		sh->addr = va;
 		sh->off = fo;
 		sh->size = w;
@@ -527,8 +530,8 @@ asmb(void)
 		w = bsssize;
 
 		sh = newElf64SHdr();
-		sh->type = 8;
-		sh->flags = 3;
+		sh->type = SHT_NOBITS;
+		sh->flags = SHF_WRITE+SHF_ALLOC;
 		sh->addr = va;
 		sh->off = fo;
 		sh->size = w;
@@ -538,7 +541,7 @@ asmb(void)
 		w = strtabsize;
 
 		sh = newElf64SHdr();
-		sh->type = 3;
+		sh->type = SHT_STRTAB;
 		sh->off = fo;
 		sh->size = w;
 		sh->addralign = 1;
@@ -551,7 +554,7 @@ asmb(void)
 		w = symsize;
 
 		sh = newElf64SHdr();
-		sh->type = 1;	/* type 1 = SHT_PROGBITS */
+		sh->type = SHT_PROGBITS;
 		sh->off = fo;
 		sh->size = w;
 		sh->addralign = 1;
@@ -562,7 +565,7 @@ asmb(void)
 		w = lcsize;
 
 		sh = newElf64SHdr();
-		sh->type = 1;	/* type 1 = SHT_PROGBITS */
+		sh->type = SHT_PROGBITS;
 		sh->off = fo;
 		sh->size = w;
 		sh->addralign = 1;

src/cmd/ld/elf64.c

@@ -7,19 +7,16 @@
 #include "../ld/elf64.h"
 
 void
-elf64phdr(int type, int flags, vlong foff,
-	vlong vaddr, vlong paddr,
-	vlong filesize, vlong memsize, vlong align)
+elf64phdr(Elf64PHdr *e)
 {
-
-	lputl(type);			/*  type */
-	lputl(flags);			/* flags */
-	vputl(foff);			/* file offset */
-	vputl(vaddr);			/* vaddr */
-	vputl(paddr);			/* paddr */
-	vputl(filesize);		/* file size */
-	vputl(memsize);		/* memory size */
-	vputl(align);			/* alignment */
+	lputl(e->type);
+	lputl(e->flags);
+	vputl(e->off);
+	vputl(e->vaddr);
+	vputl(e->paddr);
+	vputl(e->filesz);
+	vputl(e->memsz);
+	vputl(e->align);
 }
 
 void
@@ -106,3 +103,14 @@ newElf64SHdr()
 	return e;
 }
 
+
+Elf64PHdr*
+newElf64PHdr()
+{
+	Elf64PHdr *e;
+
+	e = malloc(sizeof *e);
+	memset(e, 0, sizeof *e);
+	return e;
+}
+

src/cmd/ld/elf64.h

@@ -47,6 +47,7 @@ typedef int64	Elf64_Sxword; 	/* Signed long integer */
 
 typedef struct Elf64Hdr		Elf64Hdr;
 typedef struct Elf64SHdr	Elf64SHdr;
+typedef struct Elf64PHdr	Elf64PHdr;
 
 struct Elf64Hdr
 {
@@ -66,6 +67,32 @@ struct Elf64Hdr
 	Elf64_Half	shstrndx;	/* Section name string table index */
 };
 
+struct Elf64PHdr
+{
+	Elf64_Word	type;	/* Type of segment */ 
+	Elf64_Word	flags;	/* Segment attributes */ 
+	Elf64_Off	off;	/* Offset in file */ 
+	Elf64_Addr	vaddr;	/* Virtual address in memory */ 
+	Elf64_Addr	paddr;	/* Reserved */ 
+	Elf64_Xword	filesz;	/* Size of segment in file */ 
+	Elf64_Xword	memsz;	/* Size of segment in memory */ 
+	Elf64_Xword	align;	/* Alignment of segment */ 
+};
+
+/* P types */
+#define	PT_NULL		0	/* Unused entry */
+#define	PT_LOAD		1	/* Loadable segment */
+#define	PT_DYNAMIC	2	/* Dynamic linking tables */
+#define	PT_INTERP	3	/* Program interpreter path name */
+#define	PT_NOTE		4	/* Note sections */
+
+/* P flags */
+#define	PF_X	0x1	/* Execute permission */
+#define	PF_W	0x2	/* Write permission */
+#define	PF_R	0x4	/* Read permission */
+#define	PF_MASKOS	0x00FF0000 /* reserved for environment-specific use */
+#define	PF_MASKPROC	0xFF000000 /*reserved for processor-specific use */
+
 struct Elf64SHdr
 {
 	Elf64_Word	name;	/* Section name */
@@ -80,10 +107,34 @@ struct Elf64SHdr
 	Elf64_Xword	entsize;	/* Size of entries, if section has table */
 };
 
+/* S types */
+#define SHT_NULL	0	/* Unused section header */
+#define SHT_PROGBITS	1	/* Information defined by the program */
+#define SHT_SYMTAB	2	/* Linker symbol table */
+#define SHT_STRTAB	3	/* String table */
+#define SHT_RELA	4 	/* "Rela" type relocation entries */
+#define SHT_HASH	5	/* Symbol hash table */
+#define SHT_DYNAMIC	6	/* Dynamic linking tables */
+#define SHT_NOTE	7	/* Note information */
+#define SHT_NOBITS	8	/* Uninitialized space; does not occupy any space in the file */ 
+#define SHT_REL		9	/* "Rel" type relocation entries */
+#define SHT_SHLIB	10	/* Reserved */
+#define SHT_DYNSYM	11	/* A dynamic loader symbol table */ 
+#define SHT_LOOS	0x60000000	/* Environment-specific use */
+#define SHT_HIOS	0x6FFFFFFF 
+#define SHT_LOPROC	0x70000000	/* Processor-specific use */
+#define SHT_HIPROC 0x7FFFFFFF
+
+/* S flags */
+#define	SHF_WRITE	0x1 /* Writable data */
+#define	SHF_ALLOC	0x2 /* Allocated in memory image of program */ 
+#define	SHF_EXECINSTR	0x4 /* Executable instructions */
+#define	SHF_MASKOS	0x0F000000	/* Environment-specific use */
+#define	SHF_MASKPROC	0xF0000000	/* Processor-specific use */
+
 Elf64SHdr	*newElf64SHdr();
+Elf64PHdr	*newElf64PHdr();
 uint32	elf64headr(void);
-void	elf64phdr(int type, int flags, vlong foff,
-	vlong vaddr, vlong paddr,
-	vlong filesize, vlong memsize, vlong align);
+void	elf64phdr(Elf64PHdr*);
 void	elf64shdr(char*, Elf64SHdr*);
 int	elf64strtable(void);