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refactor, improve exception message

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trimill 2024-01-29 21:10:29 -05:00
parent b9754579df
commit 417d5b17b8
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6 changed files with 130 additions and 85 deletions
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61
include/lib.h
View file

@ -1,92 +1,111 @@
#pragma once
#include <stddef.h>
/**
* The memcmp() function compares the first n bytes (each interpreted as unsigned char) of the memory
* areas s1 and s2.
*/
extern int memcmp(const void *restrict s1, const void *restrict s2, unsigned long n);
int memcmp(const void *restrict s1, const void *restrict s2, unsigned long n);
/**
* The memcpy() function copies n bytes from memory area src to memory area dest.
* The memory areas must not overlap.
*/
extern void *memcpy(void *restrict dest, const void *restrict src, unsigned long n);
void *memcpy(void *restrict dest, const void *restrict src, unsigned long n);
/**
* The memmove() function copies n bytes from memory area src to memory area dest. The memory areas
* may overlap: copying takes place as though the bytes in src are first copied into a temporary array
* that does not overlap src or dest, and the bytes are then copied from the temporary array to dest.
*/
extern void *memmove(void *dest, const void *src, unsigned long n);
void *memmove(void *dest, const void *src, unsigned long n);
/**
* The memset() function fills the first n bytes of the memory area pointed to by s with the constant
* byte c.
*/
extern void *memset(void *restrict dest, int c, unsigned long n);
void *memset(void *restrict dest, int c, unsigned long n);
/**
* The strcmp() function compares the two strings s1 and s2. The locale is not taken into account
* (for a locale-aware comparison, see strcoll(3)). The comparison is done using unsigned characters.
*/
extern int strncmp(const char *restrict s1, const char *restrict s2, unsigned long n);
int strncmp(const char *restrict s1, const char *restrict s2, unsigned long n);
/**
* Copys the string pointed to by src , into a string at the buffer pointer to by dest.
* The dest buffer must be long enough to hold src.
*/
extern char *strcpy(char *restrict dest, const char *restrict src);
char *strcpy(char *restrict dest, const char *restrict src);
/**
* Copys the string pointed to by src , into a string at the buffer pointer to by dest.
* The dest buffer must be long enough to hold src or size n.
*/
extern char *strncpy(char *restrict dest, const char *restrict src, unsigned long n);
char *strncpy(char *restrict dest, const char *restrict src, unsigned long n);
/**
* Calculates the length of the string pointed to by str, excluding
* the terminating null byte
* @param str - the string pointer
* @returns the length of the string in bytes
*/
size_t strlen(const char *str);
/**
* Concatenate the string pointed to by src after the string pointed
* to by dst.
* @param dst - the pointer to the destination string
* @param src - the pointer to the source string
* @returns dst
*/
char *strcat(char *restrict dst, const char *restrict src);
/**
* @returns 1 if c is a space
*/
extern int isspace(int c);
int isspace(int c);
/**
* @returns 1 if c is a digit (0 - 9)
*/
extern int isdigit(int c);
int isdigit(int c);
/**
* converts single digit int to base 36
* @param i - int
* @returns c - base 36 char
*/
extern char itoc(int i);
char itoc(int i);
/**
* converts single base 36 chat into int
* @param c - base 36 char
* @returns i - int
*/
extern int ctoi(char c);
int ctoi(char c);
/**
* Converts the initial portiion of the string pointed to by s to int.
* @param s - the string to convert
* @returns the number inside s or 0 on error
*/
extern int atoi(const char* s);
int atoi(const char* s);
/**
* Converts the initial portiion of the string pointed to by s to long.
* @param s - the string to convert
* @returns the number inside s or 0 on error
*/
extern long int atol(const char* s);
long int atol(const char* s);
/**
* Converts the initial portiion of the string pointed to by s to long long.
* @param s - the string to convert
* @returns the number inside s or 0 on error
*/
extern long long int atoll(const char* s);
long long int atoll(const char* s);
/**
* Converts a integer to asci inside a string with a given radix (base).
@ -94,7 +113,7 @@ extern long long int atoll(const char* s);
* @param buffer - the string buffer
* @param radix - the base to convert
*/
extern char *itoa(int n, char *buffer, int radix);
char *itoa(int n, char *buffer, int radix);
/**
* Converts a long to asci inside a string with a given radix (base).
@ -102,7 +121,7 @@ extern char *itoa(int n, char *buffer, int radix);
* @param buffer - the string buffer
* @param radix - the base to convert
*/
extern char *ltoa(long int n, char *buffer, int radix);
char *ltoa(long int n, char *buffer, int radix);
/**
* Converts a unsigned integer to asci inside a string with a given radix (base).
@ -110,7 +129,7 @@ extern char *ltoa(long int n, char *buffer, int radix);
* @param buffer - the string buffer
* @param radix - the base to convert
*/
extern char *utoa(unsigned int n, char *buffer, int radix);
char *utoa(unsigned int n, char *buffer, int radix);
/**
* Converts a unsigned long to asci inside a string with a given radix (base).
@ -118,7 +137,7 @@ extern char *utoa(unsigned int n, char *buffer, int radix);
* @param buffer - the string buffer
* @param radix - the base to convert
*/
extern char *ultoa(unsigned long int n, char *buffer, int radix);
char *ultoa(unsigned long int n, char *buffer, int radix);
/**
* Converts the string in str to an int value based on the given base.
@ -128,7 +147,7 @@ extern char *ultoa(unsigned long int n, char *buffer, int radix);
* @param base - the base to convert to
* @returns 0 on error or success, error if endptr is still equal to str
*/
extern int strtoi(const char *str, char **endptr, int base);
int strtoi(const char *str, char **endptr, int base);
/**
* Converts the string in str to an long value based on the given base.
@ -138,7 +157,7 @@ extern int strtoi(const char *str, char **endptr, int base);
* @param base - the base to convert to
* @returns 0 on error or success, error if endptr is still equal to str
*/
extern long int strtol(const char *str, char **endptr, int base);
long int strtol(const char *str, char **endptr, int base);
/**
* Converts the string in str to an long long value based on the given base.
@ -148,4 +167,4 @@ extern long int strtol(const char *str, char **endptr, int base);
* @param base - the base to convert to
* @returns 0 on error or success, error if endptr is still equal to str
*/
extern long long int strtoll(const char *str, char **endptr, int base);
long long int strtoll(const char *str, char **endptr, int base);

8
src/arch/amd64/idt.S
View file

@ -7,11 +7,13 @@ extern idt_pic_mouse
extern idt_pic_eoi
%macro PUSHALL 0
push rax
push rbx
push rcx
push rdx
push rsi
push rbp
push rdi
push rsi
push r8
push r9
push r10
@ -31,11 +33,13 @@ extern idt_pic_eoi
pop r10
pop r9
pop r8
pop rdi
pop rsi
pop rdi
pop rbp
pop rdx
pop rcx
pop rbx
pop rax
%endmacro
; call the exception handler with the interrupt number

119
src/arch/amd64/idt.c
View file

@ -73,68 +73,81 @@ void idt_init(void) {
// Intel manual vol 3 ch 6.3.1
char *EXCEPTIONS[] = {
"Exception 0x00 Divide Error",
"Exception 0x01 Debug Exception",
"Exception 0x02 NMI Interrupt",
"Exception 0x03 Breakpoint",
"Exception 0x04 Overflow",
"Exception 0x05 BOUND Range Exceeded",
"Exception 0x06 Invalid Opcode",
"Exception 0x07 Device Not Available",
"Exception 0x08 Double Fault",
"Exception 0x09 Coprocessor Segment Overrun",
"Exception 0x0A Invalid TSS",
"Exception 0x0B Segment Not Present",
"Exception 0x0C Stack-Segment Fault",
"Exception 0x0D General Protection",
"Exception 0x0E Page Fault",
"Exception 0x0F Reserved",
"Exception 0x10 x87 FPU Floating-Point Error",
"Exception 0x11 Alignment Check",
"Exception 0x12 Machine Check",
"Exception 0x13 SIMD Floaing-Point Exception",
"Exception 0x14 Virtualization Exception",
"Exception 0x15 Control Protection Exception",
"Exception 0x16 Reserved",
"Exception 0x17 Reserved",
"Exception 0x18 Reserved",
"Exception 0x19 Reserved",
"Exception 0x1A Reserved",
"Exception 0x1B Reserved",
"Exception 0x1C Reserved",
"Exception 0x1D Reserved",
"Exception 0x1E Reserved",
"Exception 0x1F Reserved",
"0x00 Division Error",
"0x01 Debug",
"0x02 NMI",
"0x03 Breakpoint",
"0x04 Overflow",
"0x05 BOUND Range Exceeded",
"0x06 Invalid Opcode",
"0x07 Device Not Available",
"0x08 Double Fault",
"0x09 Coprocessor Segment Overrun",
"0x0A Invalid TSS",
"0x0B Segment Not Present",
"0x0C Stack-Segment Fault",
"0x0D General Protection Fault",
"0x0E Page Fault",
"0x0F Reserved",
"0x10 x87 Floating-Point Error",
"0x11 Alignment Check",
"0x12 Machine Check",
"0x13 SIMD Floaing-Point Exception",
"0x14 Virtualization Exception",
"0x15 Control Protection Exception",
"0x16 Reserved",
"0x17 Reserved",
"0x18 Reserved",
"0x19 Reserved",
"0x1A Reserved",
"0x1B Reserved",
"0x1C Hypervisor Injection Exception",
"0x1D VMM Communication Exception",
"0x1E Security Exception",
"0x1F Reserved",
};
void idt_exception_handler(uint64_t exception, uint64_t code) {
// TODO don't just panic
char buf[24];
char msg[256] = "Exception ";
strcat(msg, EXCEPTIONS[exception]);
strcat(msg, "\nError code 0x");
ultoa(code, buf, 16);
strcat(msg, buf);
// page faults store the offending address in cr2
if(exception == 0x0E) {
strcat(msg, "\nPage fault address: 0x");
void *addr;
__asm__ volatile ("mov %%cr2, %0" : "=r"(addr));
ultoa((size_t)addr, buf, 16);
strcat(msg, buf);
}
panic(msg);
}
void idt_pic_eoi(uint8_t exception) {
pic_eoi(exception - PIC_REMAP_OFFSET);
}
static size_t timer = 0;
int counter = 0;
void idt_pic_timer(void) {
timer += 1;
char buf[20];
ltoa(timer, buf, 10);
serial_out_str(buf);
serial_out_str("\n");
// print a message once we know the timer works
// but avoid spamming the logs
if (counter == 3) {
serial_out_str("pic timer!\n");
}
if (counter <= 3) {
counter++;
}
}
void idt_pic_keyboard(void) {
serial_out_str("ps2 kbd");
}
void idt_pic_keyboard(void) {}
void idt_pic_mouse(void) {
serial_out_str("ps2 mouse");
}
void idt_exception_handler(uint64_t exception, uint64_t code) {
// TODO don't just panic
char buf[80];
char *end = strcpy(buf, EXCEPTIONS[exception]);
end = strcpy(end, "\nError code 0x");
ltoa(code, end, 16);
panic(buf);
}
void idt_pic_mouse(void) {}

5
src/arch/amd64/panic.c
View file

@ -6,11 +6,12 @@
_Noreturn void _panic_impl(char *line, char *file, char *msg) {
cli();
serial_out_str("\n\n!!! PANIC !!!\n");
serial_out_str(msg);
serial_out_str("\nin file ");
serial_out_str("In file ");
serial_out_str(file);
serial_out_str(" at line ");
serial_out_str(line);
serial_out_str(":\n");
serial_out_str(msg);
serial_out('\n');
while (1) {
halt();

9
src/kmain.c
View file

@ -5,14 +5,11 @@
#include <shim.h>
void kmain(struct boot_info *info) {
char buf[20];
*(char*)0xB8000 = 'c';
memory_init(info->map);
//*(char*)(0xB8002 + 0x20'0000) = 'd';
itoa((long)info, buf, 16);
itoa(*(long*)info, buf, 16);
serial_out_str("entered kmain\n");
*(char*)(0xB8000 + 0x144) = 'h';
*(char*)(0xB8000 + 0x146) = 'i';
//fb_init(1024, 768);
serial_out_str(buf);
while (1) {
// loop so we dont halt
// this allows interrupts to fire

11
src/lib.c
View file

@ -54,6 +54,17 @@ char *strncpy(char *restrict dest, const char *restrict src, unsigned long n) {
return dest;
}
size_t strlen(const char *str) {
const char *p;
for(p = str; *p != 0; p++) {}
return p - str;
}
char *strcat(char *restrict dst, const char *restrict src) {
strcpy(dst + strlen(dst), src);
return dst;
}
int isspace(int c) {
switch (c) {
case ' ':