[PATCH v1 00/11] Add dynamic memory allocator support for nolibc

[Ammar Faizi <ammarfaizi2@gnuweeb.org>]

Hi,

This is a patchset to add dynamic memory allocator support for
nolibc after 2 RFCs, please review the changes carefully.

There are 3 *new* patches after RFC v2:
  Address report from Alviro:
   - Replace `asm` with `__asm__`.
  Address suggestions from David:
   - x86-64: Use appropriate register constraints if exist (Suggested by David).
   - i386: Use appropriate register constraints if exist.

@@ Changelog:
---
   Link RFC v2: https://lore.kernel.org/lkml/20220322102115.186179-1-ammarfaizi2@gnuweeb.org/
   RFC v2 -> v1:
     - Rebase, sync with Paul's tree.
     - Add new 3 patches [PATCH 03/11], [PATCH 04/11], [PATCH 05/11].

     [PATCH 02/11]
     - Append Reviewed-by tag from Nick.
     - s/Removing/remove/

     [PATCH 06/11]
     - Use the same pattern for syscall6, regardless using GCC or Clang
      (comment from David).
     - Use appropriate constraints for syscall6 instead of always using
      register variables (comment from David).

     [PATCH 09/11]
     - Round up the malloc() allocation to 4096 (comment from David).
     - Don't realloc() if we still have enough memory to contain the
       requested new size (comment from David).
     - Fix conflict with getenv() fix (after rebase).

   Link RFC v1: https://lore.kernel.org/lkml/20220320093750.159991-1-ammarfaizi2@gnuweeb.org/
   RFC v1 -> RFC v2:
    - Add 2 new patches [PATCH 5/8] and [PATCH 7/8].

    [PATCH 2/8]
    - Remove all `.global _start` for all build (GCC and Clang) instead of
      removing all `.weak _start` for clang build (Comment from Willy).

    [PATCH 3/8]
    - Fix %ebp saving method. Don't use redzone, i386 doesn't have a redzone
      (comment from David and Alviro).

    [PATCH 6/8]
    - Move container_of() and offsetof() macro to types.h with a
      separate patch (comment from Willy).

    [PATCH 8/8]
    - Update strdup and strndup implementation, use strlen and strnlen to get
      the string length first (comment from Willy and Alviro).
    - Fix the subject line prefix, it was "tools/include/string: ", it should be
      "tools/nolibc/string: ".
    - Update the commit message.

Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
---
Ammar Faizi (11):
  tools/nolibc: x86-64: Update System V ABI document link
  tools/nolibc: Remove .global _start from the entry point code
  tools/nolibc: Replace `asm` with `__asm__`
  tools/nolibc: x86-64: Use appropriate register constraints if exist
  tools/nolibc: i386: Use appropriate register constraints if exist
  tools/nolibc: i386: Implement syscall with 6 arguments
  tools/nolibc/sys: Implement `mmap()` and `munmap()`
  tools/nolibc/types: Implement `offsetof()` and `container_of()` macro
  tools/nolibc/stdlib: Implement `malloc()`, `calloc()`, `realloc()` and `free()`
  tools/nolibc/string: Implement `strnlen()`
  tools/include/string: Implement `strdup()` and `strndup()`

 tools/include/nolibc/arch-aarch64.h |  73 +++++-----
 tools/include/nolibc/arch-arm.h     |  59 ++++----
 tools/include/nolibc/arch-i386.h    | 188 ++++++++++++-------------
 tools/include/nolibc/arch-mips.h    |  63 +++++----
 tools/include/nolibc/arch-riscv.h   |  75 +++++-----
 tools/include/nolibc/arch-x86_64.h  | 207 +++++++++++++---------------
 tools/include/nolibc/stdlib.h       |  81 +++++++++++
 tools/include/nolibc/string.h       |  41 ++++++
 tools/include/nolibc/sys.h          |  62 +++++++++
 tools/include/nolibc/types.h        |  11 ++
 10 files changed, 515 insertions(+), 345 deletions(-)


base-commit: b3f38ba2d1ccaa4c4b2096a310e7b170ef559d4d
-- 
Ammar Faizi