diff --git a/include/process.h b/include/process.h index ee1573d..62f92b8 100755 --- a/include/process.h +++ b/include/process.h @@ -143,3 +143,7 @@ void task_init(); u32 task_getfreePID (); u32 task_usePID (u32 pid); u32 task_create(); +u32 elf_test(u8 *src); +u32 elf_load(u8 *src, u32 pid); +process *getcurrentprocess(); +void task_run(u32 pid); diff --git a/lib/interrupts.c b/lib/interrupts.c index 9769352..5ae92d7 100755 --- a/lib/interrupts.c +++ b/lib/interrupts.c @@ -9,6 +9,7 @@ #include "gdt.h" #include "system.h" #include "debug.h" +#include "process.h" #define IDT_SIZE 256 /* nombre de descripteurs */ @@ -401,6 +402,16 @@ void exception13() cpuerror("#GP General protection fault (GPF)",dump); } +static u8 ex14_errors1[]="Supervisory process tried to read a non-present page entry"; +static u8 ex14_errors2[]="Supervisory process tried to read a page and caused a protection fault"; +static u8 ex14_errors3[]="Supervisory process tried to write to a non-present page entry"; +static u8 ex14_errors4[]="Supervisory process tried to write a page and caused a protection fault"; +static u8 ex14_errors5[]="User process tried to read a non-present page entry"; +static u8 ex14_errors6[]="User process tried to read a page and caused a protection fault"; +static u8 ex14_errors7[]="User process tried to write to a non-present page entry"; +static u8 ex14_errors8[]="User process tried to write a page and caused a protection fault"; +static u8 *ex14_errors[]={&ex14_errors1,&ex14_errors2,&ex14_errors3,&ex14_errors4,&ex14_errors5,&ex14_errors6,&ex14_errors7,&ex14_errors8}; + void exception14() { regs *dump; @@ -413,37 +424,20 @@ void exception14() dump->esp=*oldesp; dump->ebp=*((u32 *) dump->esp); dump->eip=current->eip; - u8* errorstring; - u8 completeerrorstring[255]; - switch (current->error_code & 0xF) { - case 0: - errorstring="Supervisory process tried to read a non-present page entry"; - break; - case 1: - errorstring="Supervisory process tried to read a page and caused a protection fault"; - break; - case 2: - errorstring="Supervisory process tried to write to a non-present page entry"; - break; - case 3: - errorstring="Supervisory process tried to write a page and caused a protection fault"; - break; - case 4: - errorstring="User process tried to read a non-present page entry"; - break; - case 5: - errorstring="User process tried to read a page and caused a protection fault"; - break; - case 6: - errorstring="User process tried to write to a non-present page entry"; - break; - case 7: - errorstring="User process tried to write a page and caused a protection fault"; - break; - } - // printf("%X",current->error_code); - sprintf(&completeerrorstring,"#PF Page fault - %s at adress %X",errorstring,dump->cr2); - cpuerror(&completeerrorstring,dump); + if (dump->cr2 >= USER_CODE && dump->cr2 < USER_STACK) + { + virtual_range_new(getcurrentprocess()->pdd, (u8 *) (dump->cr2 & 0xFFFFF000), PAGESIZE, PAGE_ALL); + } + else { + printf("Page fault - %s at adress %Y cs:eip - %Y:%Y\r\n",ex14_errors[current->error_code & 0xF],dump->cr2,dump->cs,dump->eip); + cpuerror("#SS Page fault",dump); + } + dump->ebp=oldesp; + restdebugcpu(); + leave(); + sti(); + asm("addl $0x04,%%esp"::); + iret(); } void exception15() diff --git a/lib/makefile b/lib/makefile index 1099343..e76ea7e 100755 --- a/lib/makefile +++ b/lib/makefile @@ -1,4 +1,4 @@ -CC=gcc -O0 -g -nostdinc -ffreestanding -fno-builtin -Wall -w -m32 -F elf_i386 -I ../include +CC=gcc -O0 -g -nostdinc -ffreestanding -fno-builtin -Wall -w -m32 -F elf_i386 -fno-pie -no-pie -I ../include LINK=ld -m elf_i386 -r -o SRCS= $(wildcard *.c) OBJS= $(SRCS:.c=.o) diff --git a/lib/process.c b/lib/process.c index 89f2fb4..bc7db02 100644 --- a/lib/process.c +++ b/lib/process.c @@ -12,13 +12,13 @@ process *current; u32 lastpid; -u8 elf_errors1[]="Aucune signature ELF"; -u8 elf_errors2[]="Fichier au format ELF mais non 32 bits"; -u8 elf_errors3[]="ELF non LSB"; -u8 elf_errors4[]="ELF mauvaise version"; -u8 elf_errors5[]="ELF pour OS ne correspondant pas"; -u8 elf_errors6[]="Mauvais type de machine"; -u8 *elf_errors[6]={&elf_errors1,&elf_errors2,&elf_errors3,&elf_errors4,&elf_errors5,&elf_errors6}; +static u8 elf_errors1[]="Aucune signature ELF"; +static u8 elf_errors2[]="Fichier au format ELF mais non 32 bits"; +static u8 elf_errors3[]="ELF non LSB"; +static u8 elf_errors4[]="ELF mauvaise version"; +static u8 elf_errors5[]="ELF pour OS ne correspondant pas"; +static u8 elf_errors6[]="Mauvais type de machine"; +static u8 *elf_errors[]={&elf_errors1,&elf_errors2,&elf_errors3,&elf_errors4,&elf_errors5,&elf_errors6}; /*******************************************************************************/ /* Vérifie la signature ELF @@ -44,7 +44,7 @@ u32 elf_test(u8 *src) return 4; if (header->e_ident[EI_OSABI]!=ELFOSABI_COS2000) return 5; - if (header->e_machine==EM_386) + if (header->e_machine!=EM_386) return 6; return 0; } @@ -68,7 +68,7 @@ u32 elf_load(u8 *src, u32 pid) program = (elf32p *) (src + header->e_phoff); code=elf_test(src); if (code!=0) { - printf("Mauvais format ELF : N°%s !\r\n",elf_errors[code-1]); + printf("Erreur de chargement ELF, %s !\r\n",elf_errors[code-1]); return NULL; } for (i = 0; i < header->e_phnum; i++, program++) { @@ -91,12 +91,13 @@ u32 elf_load(u8 *src, u32 pid) processes[pid].bss_low = (u8*) v_begin; processes[pid].bss_high = (u8*) v_end; } - memcpy((u8 *) v_begin, (u8 *) (src + program->p_offset), program->p_filesz,0); + memcpy((u8 *) (src + program->p_offset),(u8 *) v_begin , program->p_filesz,0); if (program->p_memsz > program->p_filesz) for (i = program->p_filesz, ptr = (u8 *) program->p_vaddr; i < program->p_memsz; i++) ptr[i] = 0; } } + processes[pid].entry=header->e_entry; return header->e_entry; } @@ -133,6 +134,13 @@ u32 task_getfreePID () return i; } +/*******************************************************************************/ +/* Récupère les informations sur le processus courant */ +process *getcurrentprocess() +{ + return current; +} + /*******************************************************************************/ /* Determine le dernier PID occupé */ @@ -141,11 +149,19 @@ u32 task_usePID (u32 pid) lastpid=pid; } +/*******************************************************************************/ +/* Execute une tâche */ + +void task_run(u32 pid) +{ + processes[pid].status = STATUS_RUN; +} + /*******************************************************************************/ /* Initialise une tâche */ u32 task_create(u8 *code) -{ +{ process *previous=current; u32 pid=task_getfreePID(); task_usePID(pid); @@ -156,15 +172,17 @@ u32 task_create(u8 *code) current = &processes[pid]; setcr3(processes[pid].pdd->addr->paddr); kstack = virtual_page_getfree(); - processes[pid].dump.ss = SEL_USER_STACK || RPL_RING3; + processes[pid].dump.ss = SEL_USER_STACK | RPL_RING3; processes[pid].dump.esp = USER_STACK; processes[pid].dump.eflags = 0x0; - processes[pid].dump.cs = SEL_USER_CODE || RPL_RING3; + processes[pid].dump.cs = SEL_USER_CODE | RPL_RING3; processes[pid].dump.eip = elf_load(code,pid); - processes[pid].dump.ds = SEL_USER_DATA || RPL_RING3; - processes[pid].dump.es = SEL_USER_DATA || RPL_RING3; - processes[pid].dump.fs = SEL_USER_DATA || RPL_RING3; - processes[pid].dump.gs = SEL_USER_DATA || RPL_RING3; + if (processes[pid].dump.eip==NULL) + return NULL; + processes[pid].dump.ds = SEL_USER_DATA | RPL_RING3; + processes[pid].dump.es = SEL_USER_DATA | RPL_RING3; + processes[pid].dump.fs = SEL_USER_DATA | RPL_RING3; + processes[pid].dump.gs = SEL_USER_DATA | RPL_RING3; processes[pid].dump.cr3 = (u32) processes[pid].pdd->addr->paddr; processes[pid].kstack.ss0 = SEL_KERNEL_STACK; processes[pid].kstack.esp0 = (u32) kstack->vaddr + PAGESIZE - 16; @@ -178,6 +196,14 @@ u32 task_create(u8 *code) processes[pid].result = 0; processes[pid].status = STATUS_READY; current = previous; - setcr3(current->dump.cr3); - return pid; + if (current==NULL) + { + u32 pd = KERNEL_PD_ADDR; + setcr3(pd); + } + else + { + setcr3(current->dump.cr3); + } + return pid; } diff --git a/lib/shell.c b/lib/shell.c index 7f0f6e5..131a0c7 100644 --- a/lib/shell.c +++ b/lib/shell.c @@ -41,7 +41,7 @@ static command commands[] = { {"font" , "", &sfont}, {"test3d" , "", &test3d}, {"detectpci" , "", &detectpci}, - {"wmem" , "", &showmem}, + {"mem" , "", &showmem}, {"testmem" , "", &testmem}, {"testcall" , "", &testcall}, {"testtask" , "", &testtask}, @@ -87,9 +87,14 @@ int test(void) /*******************************************************************************/ /* Test l'usage de création de tâche */ +#include "test.c" + int testtask() { + task_init(); print("*** Creation d'une tache"); + u32 pid=task_create(&programs_test); + task_run(pid); } /*******************************************************************************/ diff --git a/lib/test.c b/lib/test.c new file mode 100644 index 0000000..45afb34 --- /dev/null +++ b/lib/test.c @@ -0,0 +1,225 @@ +/* +Programme de test compilé en mode USER avec SYSCALL, le binaire est intégré au noyau pour test en attendant d'avoir un pilot de disque */ + +#include "types.h" + +static u8 programs_test[] = { + 0x7f, 0x45, 0x4c, 0x46, 0x01, 0x01, 0x01, 0x10, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x40, 0x34, 0x00, 0x00, 0x00, 0x08, 0x08, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x34, 0x00, 0x20, 0x00, 0x02, 0x00, 0x28, 0x00, + 0x0e, 0x00, 0x0d, 0x00, 0x01, 0x00, 0x00, 0x00, 0x74, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x40, 0xdc, 0x00, 0x00, 0x00, + 0xdc, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, + 0x51, 0xe5, 0x74, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x06, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x8d, 0x4c, 0x24, 0x04, + 0x83, 0xe4, 0xf0, 0xff, 0x71, 0xfc, 0x55, 0x89, 0xe5, 0x53, 0x51, 0xe8, + 0x38, 0x00, 0x00, 0x00, 0x05, 0xbc, 0x00, 0x00, 0x00, 0x89, 0xc3, 0xe8, + 0x08, 0x00, 0x00, 0x00, 0x90, 0x59, 0x5b, 0x5d, 0x8d, 0x61, 0xfc, 0xc3, + 0x55, 0x89, 0xe5, 0x83, 0xec, 0x10, 0xe8, 0x19, 0x00, 0x00, 0x00, 0x05, + 0x9d, 0x00, 0x00, 0x00, 0xb8, 0x00, 0x00, 0x00, 0x00, 0x89, 0xe1, 0xba, + 0x46, 0x00, 0x00, 0x40, 0x0f, 0x34, 0x89, 0x45, 0xfc, 0x90, 0xc9, 0xc3, + 0x8b, 0x04, 0x24, 0xc3, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x7a, 0x52, 0x00, 0x01, 0x7c, 0x08, 0x01, 0x1b, 0x0c, 0x04, 0x04, + 0x88, 0x01, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x00, 0x00, + 0x90, 0xff, 0xff, 0xff, 0x28, 0x00, 0x00, 0x00, 0x00, 0x44, 0x0c, 0x01, + 0x00, 0x47, 0x10, 0x05, 0x02, 0x75, 0x00, 0x44, 0x0f, 0x03, 0x75, 0x78, + 0x06, 0x10, 0x03, 0x02, 0x75, 0x7c, 0x53, 0xc1, 0x0c, 0x01, 0x00, 0x41, + 0xc3, 0x41, 0xc5, 0x43, 0x0c, 0x04, 0x04, 0x00, 0x10, 0x00, 0x00, 0x00, + 0x50, 0x00, 0x00, 0x00, 0xa8, 0xff, 0xff, 0xff, 0x04, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x00, 0x00, 0x64, 0x00, 0x00, 0x00, + 0x70, 0xff, 0xff, 0xff, 0x24, 0x00, 0x00, 0x00, 0x00, 0x41, 0x0e, 0x08, + 0x85, 0x02, 0x42, 0x0d, 0x05, 0x60, 0xc5, 0x0c, 0x04, 0x04, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x96, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x01, + 0x2a, 0x00, 0x00, 0x00, 0x0c, 0x89, 0x00, 0x00, 0x00, 0x90, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x40, 0x28, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x02, 0x01, 0x06, 0x84, 0x00, 0x00, 0x00, 0x02, 0x02, 0x05, 0xcc, + 0x00, 0x00, 0x00, 0x03, 0x04, 0x05, 0x69, 0x6e, 0x74, 0x00, 0x02, 0x08, + 0x05, 0x00, 0x00, 0x00, 0x00, 0x02, 0x04, 0x05, 0x05, 0x00, 0x00, 0x00, + 0x02, 0x01, 0x06, 0x7d, 0x00, 0x00, 0x00, 0x02, 0x01, 0x08, 0x7b, 0x00, + 0x00, 0x00, 0x02, 0x02, 0x07, 0xb3, 0x00, 0x00, 0x00, 0x02, 0x04, 0x07, + 0x18, 0x00, 0x00, 0x00, 0x02, 0x08, 0x07, 0x13, 0x00, 0x00, 0x00, 0x02, + 0x04, 0x07, 0x1d, 0x00, 0x00, 0x00, 0x04, 0x25, 0x00, 0x00, 0x00, 0x7d, + 0x00, 0x00, 0x00, 0x05, 0x00, 0x06, 0xc6, 0x00, 0x00, 0x00, 0x02, 0x25, + 0x72, 0x00, 0x00, 0x00, 0x07, 0x0e, 0x00, 0x00, 0x00, 0x01, 0x08, 0x00, + 0x00, 0x00, 0x40, 0x28, 0x00, 0x00, 0x00, 0x01, 0x9c, 0x00, 0xbd, 0x00, + 0x00, 0x00, 0x04, 0x00, 0x61, 0x00, 0x00, 0x00, 0x04, 0x01, 0x0d, 0x01, + 0x00, 0x00, 0x0c, 0xd6, 0x00, 0x00, 0x00, 0xe6, 0x00, 0x00, 0x00, 0x28, + 0x00, 0x00, 0x40, 0x24, 0x00, 0x00, 0x00, 0x4c, 0x00, 0x00, 0x00, 0x02, + 0x01, 0x06, 0x84, 0x00, 0x00, 0x00, 0x02, 0x02, 0x05, 0xcc, 0x00, 0x00, + 0x00, 0x03, 0x04, 0x05, 0x69, 0x6e, 0x74, 0x00, 0x02, 0x08, 0x05, 0x00, + 0x00, 0x00, 0x00, 0x02, 0x04, 0x05, 0x05, 0x00, 0x00, 0x00, 0x02, 0x01, + 0x06, 0x7d, 0x00, 0x00, 0x00, 0x02, 0x01, 0x08, 0x7b, 0x00, 0x00, 0x00, + 0x02, 0x02, 0x07, 0xb3, 0x00, 0x00, 0x00, 0x02, 0x04, 0x07, 0x18, 0x00, + 0x00, 0x00, 0x02, 0x08, 0x07, 0x13, 0x00, 0x00, 0x00, 0x04, 0x75, 0x33, + 0x32, 0x00, 0x02, 0x1d, 0x76, 0x00, 0x00, 0x00, 0x02, 0x04, 0x07, 0x1d, + 0x00, 0x00, 0x00, 0x05, 0x25, 0x00, 0x00, 0x00, 0x88, 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0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, + 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x6d, 0x07, 0x00, 0x00, 0x99, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 +}; diff --git a/makefile b/makefile index 1d7a8be..e3e23d9 100755 --- a/makefile +++ b/makefile @@ -31,7 +31,7 @@ clean: littleclean: make -C system clean make -C lib clean - make -C final littleclean) + make -C final littleclean make -C programs clean sync diff --git a/system/makefile b/system/makefile index 922a303..da424b4 100755 --- a/system/makefile +++ b/system/makefile @@ -1,4 +1,4 @@ -GCC=gcc -O0 -g -nostdinc -ffreestanding -fno-builtin -Wall -w -I ../include -m32 -c -o +GCC=gcc -O0 -g -nostdinc -ffreestanding -fno-builtin -Wall -w -I ../include -m32 -fno-pie -no-pie -c -o ASM=nasm LINK=ld -m elf_i386 -T linker.lds -n -o