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bug fixes to make it work

master
Andrew Kelley 2020-04-24 02:09:30 -04:00
parent 229e99ca37
commit 058937e44d
2 changed files with 153 additions and 95 deletions
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2
src-self-hosted/codegen.zig
View File

@ -378,8 +378,8 @@ const Function = struct {
return self.fail(src, "TODO handle a larger string constant", .{});
// Emit the string literal directly into the code; jump over it.
const offset = self.code.items.len;
try self.genRelativeFwdJump(src, smaller_len);
const offset = self.code.items.len;
try self.code.appendSlice(bytes);
return MCValue{ .embedded_in_code = offset };
},

246
src-self-hosted/link.zig
View File

@ -174,7 +174,7 @@ const Update = struct {
if (program_header.p_offset <= start) continue;
if (program_header.p_offset < min_pos) min_pos = program_header.p_offset;
}
return min_pos;
return min_pos - start;
}
fn findFreeSpace(self: *Update, object_size: u64, min_alignment: u16) u64 {
@ -233,7 +233,7 @@ const Update = struct {
// There must always be a null section in index 0
try self.sections.append(.{
.sh_name = 0,
.sh_type = 0,
.sh_type = elf.SHT_NULL,
.sh_flags = 0,
.sh_addr = 0,
.sh_offset = 0,
@ -247,6 +247,8 @@ const Update = struct {
}
if (self.shstrtab_index == null) {
self.shstrtab_index = @intCast(u16, self.sections.items.len);
assert(self.shstrtab.items.len == 0);
try self.shstrtab.append(0); // need a 0 at position 0
const off = self.findFreeSpace(self.shstrtab.items.len, 1);
//std.debug.warn("found shstrtab free space 0x{x} to 0x{x}\n", .{ off, off + self.shstrtab.items.len });
try self.sections.append(.{
@ -299,7 +301,6 @@ const Update = struct {
.sh_size = file_size,
// The section header index of the associated string table.
.sh_link = self.shstrtab_index.?,
// One greater than the symbol table index of the last local symbol (binding STB_LOCAL).
.sh_info = @intCast(u32, self.module.exports.len),
.sh_addralign = min_align,
.sh_entsize = each_size,
@ -332,67 +333,8 @@ const Update = struct {
phdr_table_dirty = true;
}
const foreign_endian = self.module.target.cpu.arch.endian() != std.Target.current.cpu.arch.endian();
if (shdr_table_dirty) {
const allocated_size = self.allocatedSize(self.shdr_table_offset.?);
const needed_size = self.sections.items.len * phsize;
if (needed_size > allocated_size) {
self.shdr_table_offset = null; // free the space
self.shdr_table_offset = self.findFreeSpace(needed_size, phalign);
}
const allocator = self.sections.allocator;
switch (ptr_width) {
.p32 => {
const buf = try allocator.alloc(elf.Elf32_Shdr, self.sections.items.len);
defer allocator.free(buf);
for (buf) |*shdr, i| {
shdr.* = .{
.sh_name = self.sections.items[i].sh_name,
.sh_type = self.sections.items[i].sh_type,
.sh_flags = @intCast(u32, self.sections.items[i].sh_flags),
.sh_addr = @intCast(u32, self.sections.items[i].sh_addr),
.sh_offset = @intCast(u32, self.sections.items[i].sh_offset),
.sh_size = @intCast(u32, self.sections.items[i].sh_size),
.sh_link = self.sections.items[i].sh_link,
.sh_info = self.sections.items[i].sh_info,
.sh_addralign = @intCast(u32, self.sections.items[i].sh_addralign),
.sh_entsize = @intCast(u32, self.sections.items[i].sh_entsize),
};
if (foreign_endian) {
bswapAllFields(elf.Elf32_Shdr, shdr);
}
}
try self.file.pwriteAll(mem.sliceAsBytes(buf), self.shdr_table_offset.?);
},
.p64 => {
const buf = try allocator.alloc(elf.Elf64_Shdr, self.sections.items.len);
defer allocator.free(buf);
for (buf) |*shdr, i| {
shdr.* = .{
.sh_name = self.sections.items[i].sh_name,
.sh_type = self.sections.items[i].sh_type,
.sh_flags = self.sections.items[i].sh_flags,
.sh_addr = self.sections.items[i].sh_addr,
.sh_offset = self.sections.items[i].sh_offset,
.sh_size = self.sections.items[i].sh_size,
.sh_link = self.sections.items[i].sh_link,
.sh_info = self.sections.items[i].sh_info,
.sh_addralign = self.sections.items[i].sh_addralign,
.sh_entsize = self.sections.items[i].sh_entsize,
};
if (foreign_endian) {
bswapAllFields(elf.Elf64_Shdr, shdr);
}
}
try self.file.pwriteAll(mem.sliceAsBytes(buf), self.shdr_table_offset.?);
},
}
}
try self.writeCodeAndSymbols(&phdr_table_dirty);
try self.writeCodeAndSymbols(phdr_table_dirty, shdr_table_dirty);
if (phdr_table_dirty) {
const allocated_size = self.allocatedSize(self.phdr_table_offset.?);
@ -410,16 +352,7 @@ const Update = struct {
defer allocator.free(buf);
for (buf) |*phdr, i| {
phdr.* = .{
.p_type = self.program_headers.items[i].p_type,
.p_flags = self.program_headers.items[i].p_flags,
.p_offset = @intCast(u32, self.program_headers.items[i].p_offset),
.p_vaddr = @intCast(u32, self.program_headers.items[i].p_vaddr),
.p_paddr = @intCast(u32, self.program_headers.items[i].p_paddr),
.p_filesz = @intCast(u32, self.program_headers.items[i].p_filesz),
.p_memsz = @intCast(u32, self.program_headers.items[i].p_memsz),
.p_align = @intCast(u32, self.program_headers.items[i].p_align),
};
phdr.* = progHeaderTo32(self.program_headers.items[i]);
if (foreign_endian) {
bswapAllFields(elf.Elf32_Phdr, phdr);
}
@ -431,16 +364,7 @@ const Update = struct {
defer allocator.free(buf);
for (buf) |*phdr, i| {
phdr.* = .{
.p_type = self.program_headers.items[i].p_type,
.p_flags = self.program_headers.items[i].p_flags,
.p_offset = self.program_headers.items[i].p_offset,
.p_vaddr = self.program_headers.items[i].p_vaddr,
.p_paddr = self.program_headers.items[i].p_paddr,
.p_filesz = self.program_headers.items[i].p_filesz,
.p_memsz = self.program_headers.items[i].p_memsz,
.p_align = self.program_headers.items[i].p_align,
};
phdr.* = self.program_headers.items[i];
if (foreign_endian) {
bswapAllFields(elf.Elf64_Phdr, phdr);
}
@ -450,17 +374,63 @@ const Update = struct {
}
}
const shstrtab_sect = &self.sections.items[self.shstrtab_index.?];
if (shstrtab_dirty or self.shstrtab.items.len != shstrtab_sect.sh_size) {
const allocated_size = self.allocatedSize(shstrtab_sect.sh_offset);
const needed_size = self.shstrtab.items.len;
{
const shstrtab_sect = &self.sections.items[self.shstrtab_index.?];
if (shstrtab_dirty or self.shstrtab.items.len != shstrtab_sect.sh_size) {
const allocated_size = self.allocatedSize(shstrtab_sect.sh_offset);
const needed_size = self.shstrtab.items.len;
if (needed_size > allocated_size) {
shstrtab_sect.sh_size = 0; // free the space
shstrtab_sect.sh_offset = self.findFreeSpace(needed_size, 1);
}
shstrtab_sect.sh_size = needed_size;
//std.debug.warn("shstrtab start=0x{x} end=0x{x}\n", .{ shstrtab_sect.sh_offset, shstrtab_sect.sh_offset + needed_size });
try self.file.pwriteAll(self.shstrtab.items, shstrtab_sect.sh_offset);
if (!shdr_table_dirty) {
// Then it won't get written with the others and we need to do it.
try self.writeSectHeader(self.shstrtab_index.?);
}
}
}
if (shdr_table_dirty) {
const allocated_size = self.allocatedSize(self.shdr_table_offset.?);
const needed_size = self.sections.items.len * phsize;
if (needed_size > allocated_size) {
shstrtab_sect.sh_size = 0; // free the space
shstrtab_sect.sh_offset = self.findFreeSpace(needed_size, 1);
shstrtab_sect.sh_size = needed_size;
self.shdr_table_offset = null; // free the space
self.shdr_table_offset = self.findFreeSpace(needed_size, phalign);
}
const allocator = self.sections.allocator;
switch (ptr_width) {
.p32 => {
const buf = try allocator.alloc(elf.Elf32_Shdr, self.sections.items.len);
defer allocator.free(buf);
for (buf) |*shdr, i| {
shdr.* = sectHeaderTo32(self.sections.items[i]);
if (foreign_endian) {
bswapAllFields(elf.Elf32_Shdr, shdr);
}
}
try self.file.pwriteAll(mem.sliceAsBytes(buf), self.shdr_table_offset.?);
},
.p64 => {
const buf = try allocator.alloc(elf.Elf64_Shdr, self.sections.items.len);
defer allocator.free(buf);
for (buf) |*shdr, i| {
shdr.* = self.sections.items[i];
//std.debug.warn("writing section {}\n", .{shdr.*});
if (foreign_endian) {
bswapAllFields(elf.Elf64_Shdr, shdr);
}
}
try self.file.pwriteAll(mem.sliceAsBytes(buf), self.shdr_table_offset.?);
},
}
try self.file.pwriteAll(self.shstrtab.items, shstrtab_sect.sh_offset);
}
if (self.entry_addr == null) {
const msg = try std.fmt.allocPrint(self.errors.allocator, "no entry point found", .{});
@ -592,7 +562,7 @@ const Update = struct {
try self.file.pwriteAll(hdr_buf[0..index], 0);
}
fn writeCodeAndSymbols(self: *Update, phdr_table_dirty: *bool) !void {
fn writeCodeAndSymbols(self: *Update, phdr_table_dirty: bool, shdr_table_dirty: bool) !void {
// index 0 is always a null symbol
try self.symbols.resize(1);
self.symbols.items[0] = .{
@ -606,6 +576,7 @@ const Update = struct {
const phdr = &self.program_headers.items[self.phdr_load_re_index.?];
var vaddr: u64 = phdr.p_vaddr;
var file_off: u64 = phdr.p_offset;
var code = std.ArrayList(u8).init(self.sections.allocator);
defer code.deinit();
@ -625,6 +596,7 @@ const Update = struct {
}
continue;
}
try self.file.pwriteAll(code.items, file_off);
if (mem.eql(u8, exp.name, "_start")) {
self.entry_addr = vaddr;
@ -645,12 +617,67 @@ const Update = struct {
phdr.p_memsz = vaddr - phdr.p_vaddr;
phdr.p_filesz = phdr.p_memsz;
phdr_table_dirty.* = true;
const shdr = &self.sections.items[self.text_section_index.?];
shdr.sh_size = phdr.p_filesz;
if (!phdr_table_dirty) {
// Then it won't get written with the others and we need to do it.
try self.writeProgHeader(self.phdr_load_re_index.?);
}
if (!shdr_table_dirty) {
// Then it won't get written with the others and we need to do it.
try self.writeSectHeader(self.text_section_index.?);
}
}
return self.writeSymbols();
}
fn writeProgHeader(self: *Update, index: usize) !void {
const foreign_endian = self.module.target.cpu.arch.endian() != std.Target.current.cpu.arch.endian();
const offset = self.program_headers.items[index].p_offset;
switch (self.module.target.cpu.arch.ptrBitWidth()) {
32 => {
var phdr = [1]elf.Elf32_Phdr{progHeaderTo32(self.program_headers.items[index])};
if (foreign_endian) {
bswapAllFields(elf.Elf32_Phdr, &phdr[0]);
}
return self.file.pwriteAll(mem.sliceAsBytes(&phdr), offset);
},
64 => {
var phdr = [1]elf.Elf64_Phdr{self.program_headers.items[index]};
if (foreign_endian) {
bswapAllFields(elf.Elf64_Phdr, &phdr[0]);
}
return self.file.pwriteAll(mem.sliceAsBytes(&phdr), offset);
},
else => return error.UnsupportedArchitecture,
}
}
fn writeSectHeader(self: *Update, index: usize) !void {
const foreign_endian = self.module.target.cpu.arch.endian() != std.Target.current.cpu.arch.endian();
const offset = self.sections.items[index].sh_offset;
switch (self.module.target.cpu.arch.ptrBitWidth()) {
32 => {
var shdr: [1]elf.Elf32_Shdr = undefined;
shdr[0] = sectHeaderTo32(self.sections.items[index]);
if (foreign_endian) {
bswapAllFields(elf.Elf32_Shdr, &shdr[0]);
}
return self.file.pwriteAll(mem.sliceAsBytes(&shdr), offset);
},
64 => {
var shdr = [1]elf.Elf64_Shdr{self.sections.items[index]};
if (foreign_endian) {
bswapAllFields(elf.Elf64_Shdr, &shdr[0]);
}
return self.file.pwriteAll(mem.sliceAsBytes(&shdr), offset);
},
else => return error.UnsupportedArchitecture,
}
}
fn writeSymbols(self: *Update) !void {
const ptr_width: enum { p32, p64 } = switch (self.module.target.cpu.arch.ptrBitWidth()) {
32 => .p32,
@ -667,8 +694,11 @@ const Update = struct {
if (needed_size > allocated_size) {
syms_sect.sh_size = 0; // free the space
syms_sect.sh_offset = self.findFreeSpace(needed_size, sym_align);
syms_sect.sh_size = needed_size;
//std.debug.warn("moved symtab to 0x{x} to 0x{x}\n", .{ syms_sect.sh_offset, syms_sect.sh_offset + needed_size });
}
//std.debug.warn("symtab start=0x{x} end=0x{x}\n", .{ syms_sect.sh_offset, syms_sect.sh_offset + needed_size });
syms_sect.sh_size = needed_size;
syms_sect.sh_info = @intCast(u32, self.symbols.items.len);
const allocator = self.symbols.allocator;
const foreign_endian = self.module.target.cpu.arch.endian() != std.Target.current.cpu.arch.endian();
switch (ptr_width) {
@ -760,3 +790,31 @@ fn satMul(a: var, b: var) @TypeOf(a, b) {
fn bswapAllFields(comptime S: type, ptr: *S) void {
@panic("TODO implement bswapAllFields");
}
fn progHeaderTo32(phdr: elf.Elf64_Phdr) elf.Elf32_Phdr {
return .{
.p_type = phdr.p_type,
.p_flags = phdr.p_flags,
.p_offset = @intCast(u32, phdr.p_offset),
.p_vaddr = @intCast(u32, phdr.p_vaddr),
.p_paddr = @intCast(u32, phdr.p_paddr),
.p_filesz = @intCast(u32, phdr.p_filesz),
.p_memsz = @intCast(u32, phdr.p_memsz),
.p_align = @intCast(u32, phdr.p_align),
};
}
fn sectHeaderTo32(shdr: elf.Elf64_Shdr) elf.Elf32_Shdr {
return .{
.sh_name = shdr.sh_name,
.sh_type = shdr.sh_type,
.sh_flags = @intCast(u32, shdr.sh_flags),
.sh_addr = @intCast(u32, shdr.sh_addr),
.sh_offset = @intCast(u32, shdr.sh_offset),
.sh_size = @intCast(u32, shdr.sh_size),
.sh_link = shdr.sh_link,
.sh_info = shdr.sh_info,
.sh_addralign = @intCast(u32, shdr.sh_addralign),
.sh_entsize = @intCast(u32, shdr.sh_entsize),
};
}