I have a function that takes two usigned-long-long variables and two unsigned-char variables as argument. Here is the sample code: typedef unsigned char byte_t; typedef unsigned long long qword_t; void foo( byte_t state, qword_t srcAddr, byte_t routeOptions, qword_t dstAddr ) { ... } void main(void) { .... foo(0x00,0x1234ll,0x01, 0x5678ll); .... } Compiled with avr-gcc 3.4.3, for Atmega 128: avr-gcc -mmcu=atmega128 -g -Os -Wall -Wa,-adhlns=func1.o -std=gnu99 -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -ffreestanding -c func1.c -o func1.o When I tried to check the values of variable srcAddr and dstAddr within foo() using UART, they are not what they should be. srcAddr is something like 0xDE00000000001A6D, and dstAddr is 0x7800000000000056. However, If I change the order of these arguments to : void foo( qword_t srcAddr, qword_t dstAddr, byte_t state, byte_t routeOptions ) { ... } and the result would be correct.
Did you read: <http://gcc.gnu.org/bugs.html> because it says we don't want source with "...".
Fine, I'll list all codes if you insist: #include <avr/io.h> typedef unsigned char byte_t; typedef unsigned long long qword_t; void uart_init(void) { // 115200 & 8N1 UBRR1H = 0x00; UBRR1L = 0x08; UCSR1A |= (0x01<<U2X1); UCSR1C = 0x06; UCSR1B &= ~0x04; UCSR1B |= ((0x01<<RXEN1) | (0x01<<TXEN1)); } void uart_putchar(byte_t octet) { UDR1 = octet; while (!(UCSR1A & (0x01<<UDRE1))); } void uart_write(byte_t *octet, uint8_t len) { while (len--) { UDR1 = *octet++; while (!(UCSR1A & (0x01<<UDRE1))); } } void foo( byte_t state, qword_t srcAddr, byte_t routeOptions, qword_t dstAddr ) { uart_putchar(state); uart_write((byte_t *)(&srcAddr),8); uart_putchar(routeOptions); uart_write((byte_t *)(&dstAddr),8); } void main(void) { uart_init(); foo(0x00,0x1234ll,0x01, 0x5678ll); while(1); } and the output is: D1, 34,12,D1,D1,D1,D1,D1,D1, 01, AB,CD,00,CF,00,80,00,78 in hexdecimal format. Obviously it's incorrect. If I change the code to: #include <avr/io.h> typedef unsigned char byte_t; typedef unsigned long long qword_t; void uart_init(void) { // 115200 & 8N1 UBRR1H = 0x00; UBRR1L = 0x08; UCSR1A |= (0x01<<U2X1); UCSR1C = 0x06; UCSR1B &= ~0x04; UCSR1B |= ((0x01<<RXEN1) | (0x01<<TXEN1)); } void uart_putchar(byte_t octet) { UDR1 = octet; while (!(UCSR1A & (0x01<<UDRE1))); } void uart_write(byte_t *octet, uint8_t len) { while (len--) { UDR1 = *octet++; while (!(UCSR1A & (0x01<<UDRE1))); } } void foo( qword_t srcAddr, qword_t dstAddr, byte_t state, byte_t routeOptions ) { uart_putchar(state); uart_write((byte_t *)(&srcAddr),8); uart_putchar(routeOptions); uart_write((byte_t *)(&dstAddr),8); } void main(void) { uart_init(); foo(0x1234ll,0x5678ll,0x00,0x01); while(1); } And the output will be: 00, 34,12,00,00,00,00,00,00, 01, 78,56,00,00,00,00,00,00 Compiling Procedure: avr-gcc -mmcu=atmega128 -g -Os -Wall -Wa,-adhlns=main.lst -std=gnu99 -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -ffreestanding -Wl,-Map=main.map -Wl,--cref main.c -o main.elf avr-objcopy -O ihex -R .eeprom test.elf test.hex avr-objcopy -j .eeprom --set-section-flags=.eeprom="alloc,load" --change-section-lma .eeprom=0 -O ihex test.elf test.eep avr-objdump -h -S test.elf > test.lss avr-nm -n test.elf > test.sym Programming with AVR Studio 4.11 build 401, JTAGICE mkII
Sorry, typo. Compile Procedure: avr-gcc -mmcu=atmega128 -g -Os -Wall -Wa,-adhlns=test.lst -std=gnu99 -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -ffreestanding -Wl,-Map=test.map -Wl,--cref test.c -o test.elf avr-objcopy -O ihex -R .eeprom test.elf test.hex avr-objcopy -j .eeprom --set-section-flags=.eeprom="alloc,load" --change-section-lma .eeprom=0 -O ihex test.elf test.eep avr-objdump -h -S test.elf > test.lss avr-nm -n test.elf > test.sym
Marking this bug as duplicate of bug #27386 because that bug has reduced test case and more analysis. *** This bug has been marked as a duplicate of 27386 ***