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Implement setjmp(3) and longjmp(3).

This commit is contained in:
Jonas 'Sortie' Termansen 2013-03-31 15:00:12 +02:00
parent 70a661e1ab
commit aca2a41401
4 changed files with 108 additions and 26 deletions
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2
libc/Makefile
View File

@ -166,6 +166,7 @@ clock.o \
close.o \
$(CPUDIR)/calltrace.o \
$(CPUDIR)/fork.o \
$(CPUDIR)/setjmp.o \
$(CPUDIR)/signal.o \
$(CPUDIR)/syscall.o \
creat.o \
@ -293,7 +294,6 @@ select.o \
setegid.o \
seteuid.o \
setgid.o \
setjmp.o \
setlocale.o \
settermmode.o \
setuid.o \

13
libc/include/setjmp.h
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@ -29,12 +29,13 @@
__BEGIN_DECLS
struct jmp_buf_struct
{
int unused;
};
typedef struct jmp_buf_struct jmp_buf[1];
#if defined(__x86_64__)
typedef unsigned long jmp_buf[8];
#elif defined(__i386__)
typedef unsigned long jmp_buf[6];
#else
#error "You need to implement jmp_buf on your CPU"
#endif
void longjmp(jmp_buf env, int val);
int setjmp(jmp_buf env);

62
libc/x64/setjmp.s Normal file
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@ -0,0 +1,62 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
x64/setjmp.s
Implement the assembly part of setjmp.
*******************************************************************************/
.global setjmp
.type setjmp, @function
setjmp:
# TODO: Floating point stuff!
mov %rbx, 0x00(%rdi)
mov %rsp, 0x08(%rdi)
mov %rbp, 0x10(%rdi)
mov %r12, 0x18(%rdi)
mov %r13, 0x20(%rdi)
mov %r14, 0x28(%rdi)
mov %r15, 0x30(%rdi)
mov 0(%rsp), %rax
mov %rax, 0x38(%rdi)
xorl %eax, %eax
.Lsetjmp_return:
ret
.size setjmp, . - setjmp
.global longjmp
.type longjmp, @function
longjmp:
testl %esi, %esi
jnz 1f
mov $1, %esi
1:
# TODO: Floating point stuff!
mov 0x00(%rdi), %rbx
mov 0x08(%rdi), %rsp
mov 0x10(%rdi), %rbp
mov 0x18(%rdi), %r12
mov 0x20(%rdi), %r13
mov 0x28(%rdi), %r14
mov 0x30(%rdi), %r15
mov 0x38(%rdi), %rax
mov %rax, 0(%rsp)
mov %esi, %eax
jmp .Lsetjmp_return
.size longjmp, . - longjmp

57
libc/setjmp.c → libc/x86/setjmp.s
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@ -1,6 +1,6 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012.
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
@ -17,25 +17,44 @@
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
setjmp.c
Stack environment declarations.
x86/setjmp.s
Implement the assembly part of setjmp.
*******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <setjmp.h>
.global setjmp
.type setjmp, @function
setjmp:
mov 4(%esp), %ecx
# TODO: Floating point stuff!
mov %ebx, 0x00(%ecx)
mov %esi, 0x04(%ecx)
mov %edi, 0x08(%ecx)
mov %ebp, 0x0C(%ecx)
mov %esp, 0x10(%ecx)
mov 0(%esp), %eax
mov %eax, 0x14(%ecx)
xorl %eax, %eax
.Lsetjmp_return:
ret
.size setjmp, . - setjmp
void longjmp(jmp_buf env, int val)
{
(void) env;
(void) val;
fprintf(stderr, "setjmp(3) and longjmp(3) are unimplemented, abort!\n");
abort();
}
int setjmp(jmp_buf env)
{
(void) env;
return 0;
}
.global longjmp
.type longjmp, @function
longjmp:
mov 4(%esp), %ecx
mov 8(%esp), %edx
testl %edx, %edx
jnz 1f
mov $1, %edx
1:
# TODO: Floating point stuff!
mov 0x04(%ecx), %esi
mov 0x08(%ecx), %edi
mov 0x0C(%ecx), %ebp
mov 0x10(%ecx), %esp
mov 0x14(%ecx), %eax
mov %eax, 0(%esp)
mov %edx, %eax
jmp .Lsetjmp_return
.size longjmp, . - longjmp