Hi,
Following my last post, I noticed that libraries (libc) are located
below the "64K" limit, in ".text" section!
My first question is; How to put them inside the ".fartext" section to
save memory space for datas ?
Should I recompile all msp430-libc with specify "FAR" attribute to any
functions declaration ?
I use Objdump to see what the compiler does ! In the ".text" section I
have all mixed informations : source and disassemby language, but on
".fartext" section I have only disassembly language !
It's seem that there is a confusion between ".text" and ".fartext"
addresses in objdump (binutils)!
To see what's happen, I force the start ".fartext" section address at
0x15C00 (0x5C00 + 0x10000) !
I made a example :
In lower memory space:
0x05C36 : My_Asm_add_function_in_text
0x05C3A : My_C_sub_function_in_text
In upper memory space:
0x15C00 :My_Asm_add_function_in_fartext
0x15C04 : My_C_sub_function_in_fartext
0x15C08 : main
I have all mixed Informations on both section at same place for lower
memory and only disassembly language for high memory !
Disassembly of section .text:
00005c00 <__init_stack>:
5c00: 31 40 ee 5b mov #23534, r1 ;#0x5bee
00005c04 <__low_level_init>:
return a - b;
}
CODE
int My_C_sub_function_in_fartext(int a, int b)
{
5c04: b2 40 80 5a mov #23168, &0x015c ;#0x5a80
5c08: 5c 01
00005c0a <__do_clear_bss>:
}
CODE
int main(void)
{
5c0a: 3f 40 00 00 mov #0, r15 ;#0x0000
int volatile a = 10, b = 20;
5c0e: 0f 93 tst r15
5c10: 04 24 jz $+10 ;abs 0x5c1a
5c12: 1f 83 dec r15
5c14: cf 43 00 1c mov.b #0, 7168(r15);r3 As==00,
0x1c00(r15)
while (1)
{
// main loop
a = My_Asm_add_function_in_text(a, b);
5c18: fc 23 jnz $-6 ;abs 0x5c12
00005c1a <__do_copy_data>:
5c1a: 3f 40 00 00 mov #0, r15 ;#0x0000
5c1e: 0f 93 tst r15
5c20: 06 24 jz $+14 ;abs 0x5c2e
5c22: 2f 83 decd r15
5c24: 40 18 9f 4f movx 23616(r15),7168(r15);0x05c40(r15),
0x01c00(r15)
5c28: 40 5c 00 1c
a = My_C_sub_function_in_text(a, b);
5c2c: fa 23 jnz $-10 ;abs 0x5c22
00005c2e <__jump_to_main>:
5c2e: 80 01 08 5c bra #0x15c08
00005c32 <__ctors_end>:
5c32: 80 00 3e 5c bra #0x05c3e
00005c36 <My_Asm_add_function_in_text>:
b = My_Asm_add_function_in_fartext(a, b);
5c36: 0f 5e add r14, r15
5c38: 10 01 reta
00005c3a <My_C_sub_function_in_text>:
int My_Asm_add_function_in_fartext(int a, int b);
int My_C_sub_function_in_text(int a, int b)
{
return a - b;
5c3a: 0f 8e sub r14, r15
}
5c3c: 10 01 reta
00005c3e <_unexpected_>:
5c3e: 00 13 reti
Disassembly of section .fartext:
00015c00 <My_Asm_add_function_in_fartext>:
15c00: 0f 5e add r14, r15
15c02: 10 01 reta
00015c04 <My_C_sub_function_in_fartext>:
15c04: 0f 8e sub r14, r15
15c06: 10 01 reta
00015c08 <main>:
15c08: 31 40 ea 5b mov #23530, r1 ;#0x5bea
15c0c: b1 40 0a 00 mov #10, 0(r1) ;#0x000a, 0x0000(r1)
15c10: 00 00
15c12: b1 40 14 00 mov #20, 2(r1) ;#0x0014, 0x0002(r1)
15c16: 02 00
15c18: 1e 41 02 00 mov 2(r1), r14 ;0x0002(r1)
15c1c: 2f 41 mov @r1, r15
15c1e: b0 13 36 5c calla #0x05c36
15c22: 81 4f 00 00 mov r15, 0(r1) ;0x0000(r1)
15c26: 1e 41 02 00 mov 2(r1), r14 ;0x0002(r1)
15c2a: 2f 41 mov @r1, r15
15c2c: b0 13 3a 5c calla #0x05c3a
15c30: 81 4f 00 00 mov r15, 0(r1) ;0x0000(r1)
15c34: 1e 41 02 00 mov 2(r1), r14 ;0x0002(r1)
15c38: 2f 41 mov @r1, r15
15c3a: b1 13 00 5c calla #0x15c00
15c3e: 81 4f 02 00 mov r15, 2(r1) ;0x0002(r1)
15c42: 1e 41 02 00 mov 2(r1), r14 ;0x0002(r1)
15c46: 2f 41 mov @r1, r15
15c48: b1 13 04 5c calla #0x15c04
15c4c: 81 4f 02 00 mov r15, 2(r1) ;0x0002(r1)
15c50: e3 3f jmp $-56 ;abs 0x5c18
Regards, Thierry
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