Split common headers in header/src files.

5 files changed, 187 insertions, 0 deletions

diff --git a/lib/include/auxv.h b/lib/include/auxv.h
new file mode 100644
index 0000000..42dac38
--- /dev/null
+++ b/lib/include/auxv.h
@@ -0,0 +1,36 @@
+// Copyright (c) 2020 Johannes Stoelp
+
+#pragma once
+
+#include <stdint.h>
+
+/// ----------------
+/// Auxiliary Vector
+/// ----------------
+
+// NOTE: [x86-64] Either AT_EXECFD or AT_PHDR must be supplied by the Kernel.
+
+#define AT_NULL    0  /* [ignored] Mark end of auxiliary vetcor */
+#define AT_IGNORE  1  /* [ignored] */
+#define AT_EXECFD  2  /* [val] File descriptor of user program (in case Linux Kernel didn't mapped) */
+#define AT_PHDR    3  /* [ptr] Address of Phdr of use program (in case Kernel mapped user program) */
+#define AT_PHENT   4  /* [val] Size in bytes of one Phdr entry */
+#define AT_PHNUM   5  /* [val] Number of Phread entries */
+#define AT_PAGESZ  6  /* [val] System page size */
+#define AT_BASE    7  /* [ptr] `base address` interpreter was loaded to */
+#define AT_FLAGS   8  /* [val] */
+#define AT_ENTRY   9  /* [ptr] Entry point of user program */
+#define AT_NOTELF  10 /* [val] >0 if not an ELF file */
+#define AT_UID     11 /* [val] Real user id of process */
+#define AT_EUID    12 /* [val] Effective user id of process */
+#define AT_GID     13 /* [val] Real group id of process */
+#define AT_EGID    14 /* [val] Effective user id of process */
+#define AT_MAX_CNT 15
+
+typedef struct {
+    uint64_t tag;
+    union {
+        uint64_t val;
+        void* ptr;
+    };
+} Auxv64Entry;
diff --git a/lib/include/elf.h b/lib/include/elf.h
new file mode 100644
index 0000000..a0fe6f7
--- /dev/null
+++ b/lib/include/elf.h
@@ -0,0 +1,75 @@
+// Copyright (c) 2020 Johannes Stoelp
+
+#pragma once
+
+#include <stdint.h>
+
+/// --------------
+/// Program Header
+/// --------------
+
+#define PT_NULL    0 /* ignored */
+#define PT_LOAD    1 /* Mark loadable segment (allowed p_memsz > p_filesz). */
+#define PT_DYNAMIC 2 /* Location of .dynamic section */
+#define PT_INTERP  3 /* Location of .interp section */
+#define PT_NOTE    4 /* Location of auxiliary information */
+#define PT_SHLIB   5 /* Reserved, but unspecified semantic */
+#define PT_PHDR    6 /* Location & size of program headers itself */
+
+#define PT_GNU_EH_FRAME 0x6474e550 /* [x86-64] stack unwinding tables */
+#define PT_LOPROC       0x70000000
+#define PT_HIPROC       0x7fffffff
+
+#define PF_X 0x1 /* Phdr flag eXecute flag bitmask */
+#define PF_W 0x2 /* Phdr flag Write flag bitmask */
+#define PF_R 0x4 /* Phdr flag Read flag bitmask */
+
+typedef struct {
+    uint32_t type;    // Segment kind.
+    uint32_t flags;   // Flags describing Segment attributes like R, W, X.
+    uint64_t offset;  // Offset into the file where the Segment starts.
+    uint64_t vaddr;   // Virtual address of first byte of Segment in memory.
+    uint64_t paddr;   // Physical address, ignored in our case.
+    uint64_t filesz;  // Number of bytes of the Segment in the file image.
+    uint64_t memsz;   // Number of bytes of the segement in memory.
+    uint64_t align;
+} Elf64Phdr;
+
+/// ---------------
+/// Dynamic Section
+/// ---------------
+
+#define DT_NULL     0 /* [ignored] Marks end of dynamic section */
+#define DT_NEEDED   1 /* [val] Name of needed library */
+#define DT_PLTRELSZ 2 /* [val] Size in bytes of PLT relocs */
+#define DT_PLTGOT   3 /* [ptr] Processor defined value */
+#define DT_HASH     4 /* [ptr] Address of symbol hash table */
+#define DT_STRTAB   5 /* [ptr] Address of string table */
+#define DT_SYMTAB   6 /* [ptr] Address of symbol table */
+#define DT_RELA     7 /* [ptr] Address of Rela relocs */
+#define DT_RELASZ   8 /* [val] Total size of Rela relocs */
+#define DT_RELAENT  9 /* [val] Size of one Rela reloc */
+#define DT_STRSZ    10 /* [val] Size of string table */
+#define DT_SYMENT   11 /* [val] Size of one symbol table entry */
+#define DT_INIT     12 /* [ptr] Address of init function */
+#define DT_FINI     13 /* [ptr] Address of termination function */
+#define DT_SONAME   14 /* [val] Name of shared object */
+#define DT_RPATH    15 /* [val] Library search path (deprecated) */
+#define DT_SYMBOLIC 16 /* [ignored] Start symbol search here */
+#define DT_REL      17 /* [ptr] Address of Rel relocs */
+#define DT_RELSZ    18 /* [val] Total size of Rel relocs */
+#define DT_RELENT   19 /* [val] Size of one Rel reloc */
+#define DT_PLTREL   20 /* [val] Type of reloc in PLT */
+#define DT_DEBUG    21 /* [ptr] For debugging; unspecified */
+#define DT_TEXTREL  22 /* [ignored] Reloc might modify .text */
+#define DT_JMPREL   23 /* [ptr] Address of PLT relocs */
+#define DT_BIND_NOW 24 /* [ignored] Process relocations of object */
+#define DT_MAX_CNT  25
+
+typedef struct {
+    uint64_t tag;
+    union {
+        uint64_t val;
+        void* ptr;
+    };
+} Elf64Dyn;
diff --git a/lib/include/fmt.h b/lib/include/fmt.h
new file mode 100644
index 0000000..61215bc
--- /dev/null
+++ b/lib/include/fmt.h
@@ -0,0 +1,8 @@
+// Copyright (c) 2020 Johannes Stoelp
+
+#pragma once
+
+#include <stdarg.h>
+
+int vfmt(char* buf, unsigned long len, const char* fmt, va_list ap);
+int fmt(char* buf, unsigned long len, const char* fmt, ...);
diff --git a/lib/include/io.h b/lib/include/io.h
new file mode 100644
index 0000000..5ca78a3
--- /dev/null
+++ b/lib/include/io.h
@@ -0,0 +1,5 @@
+// Copyright (c) 2020 Johannes Stoelp
+
+#pragma once
+
+int pfmt(const char* fmt, ...);
diff --git a/lib/include/syscall.h b/lib/include/syscall.h
new file mode 100644
index 0000000..4947155
--- /dev/null
+++ b/lib/include/syscall.h
@@ -0,0 +1,63 @@
+// Copyright (c) 2020 Johannes Stoelp
+
+#pragma once
+
+#if !defined(__linux__) || !defined(__x86_64__)
+#    error "Only supported on linux(x86_64)!"
+#endif
+
+// Inline ASM
+//   Syntax:
+//     asm asm-qualifiers (AssemblerTemplate : OutputOperands : InputOperands : Clobbers)
+//
+//   Output operand constraints:
+//     = | operand (variable) is written to by this instruction
+//     + | operand (variable) is written to / read from by this instruction
+//
+//   Input/Output operand constraints:
+//     r | allocate general purpose register
+//
+//   Machine specific constraints (x86_64):
+//     a  | a register (eg rax)
+//     d  | d register (eg rdx)
+//     D  | di register (eg rdi)
+//     S  | si register (eg rsi)
+//
+//  Local register variables:
+//    In case a specific register is required which can not be specified via a
+//    machine specific constraint.
+//    ```c
+//    register long r12 asm ("r12") = 42;
+//    asm("nop" : : "r"(r12));
+//    ```
+//
+// Reference:
+//   https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html
+//   https://gcc.gnu.org/onlinedocs/gcc/Machine-Constraints.html#Machine-Constraints
+//   https://gcc.gnu.org/onlinedocs/gcc/Local-Register-Variables.html
+
+// Linux syscall ABI
+//  x86-64
+//    #syscall: rax
+//    ret     : rax
+//    instr   : syscall
+//    args    : rdi   rsi   rdx   r10   r8    r9
+//
+// Reference:
+//   syscall(2)
+
+#define argcast(A)              ((long)(A))
+#define syscall1(n, a1)         _syscall1(n, argcast(a1))
+#define syscall3(n, a1, a2, a3) _syscall3(n, argcast(a1), argcast(a2), argcast(a3))
+
+static inline long _syscall1(long n, long a1) {
+    long ret;
+    asm volatile("syscall" : "=a"(ret) : "a"(n), "D"(a1) : "memory");
+    return ret;
+}
+
+static inline long _syscall3(long n, long a1, long a2, long a3) {
+    long ret;
+    asm volatile("syscall" : "=a"(ret) : "a"(n), "D"(a1), "S"(a2), "d"(a3) : "memory");
+    return ret;
+}