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Add the generic syscall function

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topjohnwu 2024-02-23 18:41:39 -08:00
parent 66cee19cea
commit e0cbe28711
12 changed files with 622 additions and 0 deletions
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1
native/src/crt0/Android.mk
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@ -13,6 +13,7 @@ LOCAL_SRC_FILES := \
nolibc.c \ nolibc.c \
stdio.c \ stdio.c \
syscall.c \ syscall.c \
syscall/syscall-$(TARGET_ARCH).S \
tinystdio/tinystdio.c tinystdio/tinystdio.c
include $(BUILD_STATIC_LIBRARY) include $(BUILD_STATIC_LIBRARY)

5
native/src/crt0/nolibc.c
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@ -9,3 +9,8 @@ static int g_errno = 0;
int *__errno(void) { int *__errno(void) {
return &g_errno; return &g_errno;
} }
long __set_errno_internal(int n) {
g_errno = n;
return -1;
}

115
native/src/crt0/syscall/private/bionic_asm.h Normal file
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@ -0,0 +1,115 @@
/*
* Copyright (C) 2013 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#pragma once
#define __ASSEMBLY__
/* https://github.com/android/ndk/issues/1422 */
#include <features.h>
#include <asm/unistd.h> /* For system call numbers. */
#define MAX_ERRNO 4095 /* For recognizing system call error returns. */
#define __bionic_asm_custom_entry(f)
#define __bionic_asm_custom_end(f)
#define __bionic_asm_function_type @function
#define __bionic_asm_custom_note_gnu_section()
#if defined(__aarch64__)
#include "bionic_asm_arm64.h"
#elif defined(__arm__)
#include "bionic_asm_arm.h"
#elif defined(__i386__)
#include "bionic_asm_x86.h"
#elif defined(__riscv)
#include "bionic_asm_riscv64.h"
#elif defined(__x86_64__)
#include "bionic_asm_x86_64.h"
#endif
// Starts a normal assembler routine.
#define ENTRY(__f) __ENTRY_WITH_BINDING(__f, .globl)
// Starts an assembler routine with hidden visibility.
#define ENTRY_PRIVATE(__f) \
__ENTRY_WITH_BINDING(__f, .globl); \
.hidden __f;
// Starts an assembler routine that's weak so native bridges can override it.
#define ENTRY_WEAK_FOR_NATIVE_BRIDGE(__f) __ENTRY_WITH_BINDING(__f, .weak)
// Starts an assembler routine with hidden visibility and no DWARF information.
// Only used for internal functions passed via sa_restorer.
// TODO: can't we just delete all those and let the kernel do its thing?
#define ENTRY_NO_DWARF_PRIVATE(__f) \
__ENTRY_NO_DWARF(__f, .globl); \
.hidden __f;
// (Implementation detail.)
#define __ENTRY_NO_DWARF(__f, __binding) \
.text; \
__binding __f; \
.balign __bionic_asm_align; \
.type __f, __bionic_asm_function_type; \
__f: \
__bionic_asm_custom_entry(__f);
// (Implementation detail.)
#define __ENTRY_WITH_BINDING(__f, __binding) \
__ENTRY_NO_DWARF(__f, __binding); \
.cfi_startproc;
// Ends a normal assembler routine.
#define END(__f) \
.cfi_endproc; \
END_NO_DWARF(__f)
// Ends an assembler routine with no DWARF information.
// Only used for internal functions passed via sa_restorer.
// TODO: can't we just delete all those and let the kernel do its thing?
#define END_NO_DWARF(__f) \
.size __f, .- __f; \
__bionic_asm_custom_end(__f)
// Creates an alias `alias` for the symbol `original`.
#define ALIAS_SYMBOL(alias, original) \
.globl alias; \
.equ alias, original
// Creates an alias `alias` for the symbol `original` that's weak so it can be
// separately overridden by native bridges.
#define ALIAS_SYMBOL_WEAK_FOR_NATIVE_BRIDGE(alias, original) \
.weak alias; \
.equ alias, original
// Adds a GNU property ELF note. Important on arm64 to declare PAC/BTI support.
#define NOTE_GNU_PROPERTY() __bionic_asm_custom_note_gnu_section()
// Gives local labels a more convenient and readable syntax.
#define L(__label) .L##__label

48
native/src/crt0/syscall/private/bionic_asm_arm.h Normal file
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@ -0,0 +1,48 @@
/* $OpenBSD: asm.h,v 1.1 2004/02/01 05:09:49 drahn Exp $ */
/* $NetBSD: asm.h,v 1.4 2001/07/16 05:43:32 matt Exp $ */
/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)asm.h 5.5 (Berkeley) 5/7/91
*/
#pragma once
#define __bionic_asm_align 0
#undef __bionic_asm_custom_entry
#undef __bionic_asm_custom_end
#define __bionic_asm_custom_entry(f) .fnstart
#define __bionic_asm_custom_end(f) .fnend
#undef __bionic_asm_function_type
#define __bionic_asm_function_type #function

79
native/src/crt0/syscall/private/bionic_asm_arm64.h Normal file
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@ -0,0 +1,79 @@
/* $OpenBSD: asm.h,v 1.1 2004/02/01 05:09:49 drahn Exp $ */
/* $NetBSD: asm.h,v 1.4 2001/07/16 05:43:32 matt Exp $ */
/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)asm.h 5.5 (Berkeley) 5/7/91
*/
#pragma once
#define __bionic_asm_align 16
#undef __bionic_asm_function_type
#define __bionic_asm_function_type %function
#if defined(__ARM_FEATURE_BTI_DEFAULT)
#define __bionic_asm_aarch64_feature_bti (1 << 0)
#undef __bionic_asm_custom_entry
#define __bionic_asm_custom_entry(f) bti c
#else
#define __bionic_asm_aarch64_feature_bti 0
#endif
#if defined(__ARM_FEATURE_PAC_DEFAULT)
#define __bionic_asm_aarch64_feature_pac (1 << 1)
#else
#define __bionic_asm_aarch64_feature_pac 0
#endif
#undef __bionic_asm_custom_note_gnu_section
#define __bionic_asm_custom_note_gnu_section() \
.pushsection .note.gnu.property, "a"; \
.balign 8; \
.long 4; \
.long 0x10; \
.long 0x5; /* NT_GNU_PROPERTY_TYPE_0 */ \
.asciz "GNU"; \
.long 0xc0000000; /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */ \
.long 4; \
.long (__bionic_asm_aarch64_feature_pac | \
__bionic_asm_aarch64_feature_bti); \
.long 0; \
.popsection;
#define NT_MEMTAG_LEVEL_MASK 3
#define NT_MEMTAG_LEVEL_NONE 0
#define NT_MEMTAG_LEVEL_ASYNC 1
#define NT_MEMTAG_LEVEL_SYNC 2
#define NT_MEMTAG_HEAP 4
#define NT_MEMTAG_STACK 8

43
native/src/crt0/syscall/private/bionic_asm_riscv64.h Normal file
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@ -0,0 +1,43 @@
/* $OpenBSD: asm.h,v 1.1 2004/02/01 05:09:49 drahn Exp $ */
/* $NetBSD: asm.h,v 1.4 2001/07/16 05:43:32 matt Exp $ */
/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)asm.h 5.5 (Berkeley) 5/7/91
*/
#pragma once
#define __bionic_asm_align 16
#undef __bionic_asm_function_type
#define __bionic_asm_function_type %function

51
native/src/crt0/syscall/private/bionic_asm_x86.h Normal file
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@ -0,0 +1,51 @@
/* $NetBSD: asm.h,v 1.40 2011/06/16 13:16:20 joerg Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)asm.h 5.5 (Berkeley) 5/7/91
*/
#pragma once
#define PIC_PROLOGUE \
pushl %ebx; \
call 666f; \
666: \
popl %ebx; \
addl $_GLOBAL_OFFSET_TABLE_+[.-666b], %ebx
#define PIC_EPILOGUE \
popl %ebx
#define PIC_PLT(x) x@PLT
#define PIC_GOT(x) x@GOT(%ebx)
#define PIC_GOTOFF(x) x@GOTOFF(%ebx)
#define __bionic_asm_align 16

42
native/src/crt0/syscall/private/bionic_asm_x86_64.h Normal file
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@ -0,0 +1,42 @@
/* $NetBSD: asm.h,v 1.18 2013/09/12 15:36:17 joerg Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)asm.h 5.5 (Berkeley) 5/7/91
*/
#pragma once
#define PIC_PLT(x) x@PLT
#define PIC_GOT(x) x@GOTPCREL(%rip)
#define __bionic_asm_align 16

51
native/src/crt0/syscall/syscall-arm.S Normal file
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@ -0,0 +1,51 @@
/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "private/bionic_asm.h"
ENTRY(syscall)
mov ip, sp
stmfd sp!, {r4, r5, r6, r7}
.cfi_def_cfa_offset 16
.cfi_rel_offset r4, 0
.cfi_rel_offset r5, 4
.cfi_rel_offset r6, 8
.cfi_rel_offset r7, 12
mov r7, r0
mov r0, r1
mov r1, r2
mov r2, r3
ldmfd ip, {r3, r4, r5, r6}
swi #0
ldmfd sp!, {r4, r5, r6, r7}
.cfi_def_cfa_offset 0
cmn r0, #(MAX_ERRNO + 1)
bxls lr
neg r0, r0
b __set_errno_internal
END(syscall)

51
native/src/crt0/syscall/syscall-arm64.S Normal file
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@ -0,0 +1,51 @@
/*
* Copyright (C) 2013 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "private/bionic_asm.h"
ENTRY(syscall)
/* Move syscall No. from x0 to x8 */
mov x8, x0
/* Move syscall parameters from x1 thru x6 to x0 thru x5 */
mov x0, x1
mov x1, x2
mov x2, x3
mov x3, x4
mov x4, x5
mov x5, x6
svc #0
/* check if syscall returned successfully */
cmn x0, #(MAX_ERRNO + 1)
cneg x0, x0, hi
b.hi __set_errno_internal
ret
END(syscall)
NOTE_GNU_PROPERTY()

73
native/src/crt0/syscall/syscall-x86.S Normal file
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@ -0,0 +1,73 @@
/*
* Generic syscall call.
* Upon entry:
* %eax: system call number - caller save
* %ebx: arg0 to system call - callee save
* %ecx: arg1 - caller save
* %edx: arg2 - caller save
* %esi: arg3 - callee save
* %edi: arg4 - callee save
* %ebp: arg5 - callee save
*/
#include "private/bionic_asm.h"
ENTRY(syscall)
# Push the callee save registers.
push %ebx
.cfi_adjust_cfa_offset 4
.cfi_rel_offset ebx, 0
push %esi
.cfi_adjust_cfa_offset 4
.cfi_rel_offset esi, 0
push %edi
.cfi_adjust_cfa_offset 4
.cfi_rel_offset edi, 0
push %ebp
.cfi_adjust_cfa_offset 4
.cfi_rel_offset ebp, 0
# Get and save the system call entry address.
call __kernel_syscall
push %eax
.cfi_adjust_cfa_offset 4
.cfi_rel_offset eax, 0
# Load all the arguments from the calling frame.
# (Not all will be valid, depending on the syscall.)
mov 24(%esp),%eax
mov 28(%esp),%ebx
mov 32(%esp),%ecx
mov 36(%esp),%edx
mov 40(%esp),%esi
mov 44(%esp),%edi
mov 48(%esp),%ebp
# Make the system call.
call *(%esp)
addl $4, %esp
# Error?
cmpl $-MAX_ERRNO, %eax
jb 1f
# Yes, so set errno.
negl %eax
pushl %eax
call __set_errno_internal
addl $4, %esp
1:
# Restore the callee save registers.
pop %ebp
.cfi_adjust_cfa_offset -4
.cfi_restore ebp
pop %edi
.cfi_adjust_cfa_offset -4
.cfi_restore edi
pop %esi
.cfi_adjust_cfa_offset -4
.cfi_restore esi
pop %ebx
.cfi_adjust_cfa_offset -4
.cfi_restore ebx
ret
END(syscall)

63
native/src/crt0/syscall/syscall-x86_64.S Normal file
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@ -0,0 +1,63 @@
/*
* Copyright (C) 2013 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Generic syscall call.
* Upon entry:
* %rax: system call number
* %rdi: arg0 to system call
* %rsi: arg1
* %rdx: arg2
* %rcx: arg3 - syscall expects it at %r10
* %r8: arg4
* %r9: arg5
*/
#include "private/bionic_asm.h"
ENTRY(syscall)
# All arguments are passed via registers.
# (Not all will be valid, depending on the syscall.)
mov %edi, %eax
mov %rsi, %rdi
mov %rdx, %rsi
mov %rcx, %rdx
mov %r8, %r10
mov %r9, %r8
mov 8(%rsp), %r9
# Make the system call.
syscall
cmpq $-MAX_ERRNO, %rax
jb 1f
negl %eax
movl %eax, %edi
call __set_errno_internal
1:
ret
END(syscall)