lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

3 files changed, 84 insertions, 0 deletions

diff --git a/lib/mlibc/options/rtdl/x86_64/elf.hpp b/lib/mlibc/options/rtdl/x86_64/elf.hpp
new file mode 100644
index 0000000..2a80644
--- /dev/null
+++ b/lib/mlibc/options/rtdl/x86_64/elf.hpp
@@ -0,0 +1,37 @@
+#pragma once
+
+#include <elf.h>
+
+#define ELF_CLASS ELFCLASS64
+#define ELF_MACHINE EM_X86_64
+
+using elf_ehdr = Elf64_Ehdr;
+using elf_phdr = Elf64_Phdr;
+using elf_dyn = Elf64_Dyn;
+using elf_rel = Elf64_Rel;
+using elf_rela = Elf64_Rela;
+using elf_relr = Elf64_Relr;
+using elf_sym = Elf64_Sym;
+using elf_addr = Elf64_Addr;
+
+using elf_info = Elf64_Xword;
+using elf_addend = Elf64_Sxword;
+
+#define ELF_R_SYM ELF64_R_SYM
+#define ELF_R_TYPE ELF64_R_TYPE
+#define ELF_ST_BIND ELF64_ST_BIND
+
+#define R_NONE R_X86_64_NONE
+#define R_JUMP_SLOT R_X86_64_JUMP_SLOT
+#define R_ABSOLUTE R_X86_64_64
+#define R_GLOB_DAT R_X86_64_GLOB_DAT
+#define R_RELATIVE R_X86_64_RELATIVE
+#define R_IRELATIVE R_X86_64_IRELATIVE
+// #define R_OFFSET
+#define R_COPY R_X86_64_COPY
+#define R_TLS_DTPMOD R_X86_64_DTPMOD64
+#define R_TLS_DTPREL R_X86_64_DTPOFF64
+#define R_TLS_TPREL R_X86_64_TPOFF64
+#define R_TLSDESC R_X86_64_TLSDESC
+
+#define TP_TCB_OFFSET 0
diff --git a/lib/mlibc/options/rtdl/x86_64/entry.S b/lib/mlibc/options/rtdl/x86_64/entry.S
new file mode 100644
index 0000000..ea64111
--- /dev/null
+++ b/lib/mlibc/options/rtdl/x86_64/entry.S
@@ -0,0 +1,11 @@
+
+.global _start
+_start:
+	call relocateSelf
+
+	mov %rsp, %rdi
+	call interpreterMain
+
+	jmp *%rax
+.section .note.GNU-stack,"",%progbits
+
diff --git a/lib/mlibc/options/rtdl/x86_64/runtime.S b/lib/mlibc/options/rtdl/x86_64/runtime.S
new file mode 100644
index 0000000..d8593c4
--- /dev/null
+++ b/lib/mlibc/options/rtdl/x86_64/runtime.S
@@ -0,0 +1,36 @@
+
+.global pltRelocateStub
+pltRelocateStub:
+	# we need to save / restore all registers than can hold function arguments
+	# we do not need to save callee-saved registers as they will not be trashed by lazyRelocate
+	# TODO: save floating point argument registers
+
+	push %rsi
+	push %rdi
+	mov 16(%rsp), %rdi
+	mov 24(%rsp), %rsi
+
+	push %rax
+	push %rcx
+	push %rdx
+	push %r8
+	push %r9
+	push %r10
+
+	call lazyRelocate
+	mov %rax, %r11
+
+	pop %r10
+	pop %r9
+	pop %r8
+	pop %rdx
+	pop %rcx
+	pop %rax
+	
+	pop %rdi
+	pop %rsi
+	add $16, %rsp
+	jmp *%r11
+
+.section .note.GNU-stack,"",%progbits
+