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ANSI C compatibility and support for AArch64

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bzt 2021-02-10 05:58:06 +01:00
parent 6ce6aa74a9
commit a8ad890000
6 changed files with 29 additions and 15 deletions
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4
README.md
View file

@ -83,8 +83,8 @@ USE_LLVM = 1
include uefi/Makefile
```
The build environment configurator was created in a way that it can handle any number of architectures, however
there's only `x86_64` crt0 implemented for now. There's an experimental `aarch64` crt0, which only compiles with
the LLVM toolchain, GNU ld has some issues with it, saying "unsupported relocation" for ImageBase.
only `x86_64` crt0 has been throughfully tested for now. There's an `aarch64` crt0 too, but since I don't have
an ARM UEFI board, it hasn't been tested on real machine. Should work though.
Notable Differences to POSIX libc
---------------------------------

2
examples/01_helloworld/Makefile
View file

@ -5,7 +5,7 @@ TARGET = helloworld.efi
#define your sources here
SRCS = $(wildcard *.c)
# define your default compiler flags
CFLAGS = -pedantic -Wall -Wextra -Werror --std=c11 -O2
CFLAGS = -pedantic -Wall -Wextra -Werror --ansi -O2
# define your default linker flags
#LDFLAGS =
# define your additional libraries here

12
uefi/Makefile
View file

@ -34,14 +34,20 @@ LIBS += -o $(TARGET).so -luefi -T uefi/elf_$(ARCH)_efi.lds
ifneq ($(ARCH),$(MYARCH))
CC = $(ARCH)-elf-gcc
LD = $(ARCH)-elf-ld
OBJCOPY ?= $(ARCH)-elf-objcopy
else
CC = gcc
LD = ld
endif
OBJCOPY ?= objcopy
endif
ifeq ($(ARCH),aarch64)
EFIARCH = pei-aarch64-little
else
EFIARCH = efi-app-$(ARCH)
endif
AR ?= ar
else
CFLAGS += --target=$(ARCH)-pc-win32-coff -Wno-builtin-requires-header -Wno-incompatible-library-redeclaration
CFLAGS += --target=$(ARCH)-pc-win32-coff -Wno-builtin-requires-header -Wno-incompatible-library-redeclaration -Wno-long-long
LDFLAGS += -subsystem:efi_application -nodefaultlib -dll -entry:uefi_init uefi/*.o
LIBS = -out:$(TARGET)
CC = clang
@ -73,7 +79,7 @@ endif
$(TARGET): $(TARGET).so
ifeq ($(USE_LLVM),)
@$(OBJCOPY) -j .text -j .sdata -j .data -j .dynamic -j .dynsym -j .rel -j .rela -j .rel.* -j .rela.* -j .reloc --target efi-app-$(ARCH) --subsystem=10 $^ $@
@$(OBJCOPY) -j .text -j .sdata -j .data -j .dynamic -j .dynsym -j .rel -j .rela -j .rel.* -j .rela.* -j .reloc --target $(EFIARCH) --subsystem=10 $^ $@ || echo target: $(EFIARCH)
@rm $(TARGET).so
endif

8
uefi/crt_aarch64.c
View file

@ -74,8 +74,7 @@ void bootstrap()
#ifndef __clang__
" .globl _start\n"
"_start:\n"
" adr x2, ImageBase\n"
/* " mov x2, xzr\n" */
" ldr x2, =ImageBase\n"
" adrp x3, _DYNAMIC\n"
" add x3, x3, #:lo12:_DYNAMIC\n"
" bl uefi_init\n"
@ -95,8 +94,10 @@ void bootstrap()
"__chkstk:\n"
" ret\n"
#endif
);
/* setjmp and longjmp */
__asm__ __volatile__ (
" .p2align 3\n"
" .globl setjmp\n"
"setjmp:\n"
@ -114,7 +115,8 @@ void bootstrap()
" stp d14, d15, [x0, #160]\n"
" mov w0, #0\n"
" ret\n"
);
__asm__ __volatile__ (
" .globl longjmp\n"
"longjmp:\n"
" ldp x19, x20, [x0, #0]\n"

5
uefi/crt_x86_64.c
View file

@ -93,8 +93,10 @@ void bootstrap()
"__chkstk:\n"
" ret\n"
#endif
);
/* setjmp and longjmp */
__asm__ __volatile__ (
" .globl setjmp\n"
"setjmp:\n"
" pop %rsi\n"
@ -109,7 +111,8 @@ void bootstrap()
" movq %rsi,0x38(%rdi)\n"
" xor %rax,%rax\n"
" ret\n"
);
__asm__ __volatile__ (
" .globl longjmp\n"
"longjmp:\n"
" movl %esi, %eax\n"

7
uefi/uefi.h
View file

@ -51,6 +51,9 @@ typedef long long int64_t;
typedef unsigned long long uint64_t;
typedef unsigned long long uintptr_t;
#endif
extern char c_assert1[sizeof(uint32_t) == 4 ? 1 : -1];
extern char c_assert2[sizeof(uint64_t) == 8 ? 1 : -1];
extern char c_assert3[sizeof(uintptr_t) == 8 ? 1 : -1];
#ifndef NULL
#define NULL ((void*)0)
@ -901,7 +904,7 @@ typedef efi_status_t (EFIAPI *efi_file_set_info_t)(efi_file_handle_t *File, efi_
void *Buffer);
typedef efi_status_t (EFIAPI *efi_file_flush_t)(efi_file_handle_t *File);
typedef struct efi_file_handle_s {
struct efi_file_handle_s {
uint64_t Revision;
efi_file_open_t Open;
efi_file_close_t Close;
@ -913,7 +916,7 @@ typedef struct efi_file_handle_s {
efi_file_get_info_t GetInfo;
efi_file_set_info_t SetInfo;
efi_file_flush_t Flush;
} efi_file_handle_t;
};
/*** Shell Parameter Protocols ***/
#ifndef EFI_SHELL_PARAMETERS_PROTOCOL_GUID