Hello,
When TinyCC compiles a program using nolibc's
[crt.h](https://github.com/torvalds/linux/blob/21b136cc63d2a9ddd60d4699552b69c214b32964/tools/include/nolibc/crt.h),
the resulting program always has an argc of 0, but this does not happen with
GCC. I simply don't have a grasp on assembly enough to see what is wrong, but I
have attached it if somebody could help me interpret it.
Cheers,
- Jonathan M. Wilbur
00000000004003e8 <_start_c>:
4003e8: 55 push %rbp
4003e9: 48 89 e5 mov %rsp,%rbp
4003ec: 48 81 ec 40 00 00 00 sub $0x40,%rsp
4003f3: 48 89 7d f8 mov %rdi,-0x8(%rbp)
4003f7: e8 b5 4b 00 00 callq 404fb1 <__stack_chk_init>
4003fc: 48 8b 45 f8 mov -0x8(%rbp),%rax
400400: 48 8b 00 mov (%rax),%rax
400403: 48 89 45 f0 mov %rax,-0x10(%rbp)
400407: 48 8b 45 f8 mov -0x8(%rbp),%rax
40040b: 48 83 c0 08 add $0x8,%rax
40040f: 48 89 45 e8 mov %rax,-0x18(%rbp)
400413: 48 8b 45 f0 mov -0x10(%rbp),%rax
400417: 48 c1 e0 03 shl $0x3,%rax
40041b: 48 8b 4d e8 mov -0x18(%rbp),%rcx
40041f: 48 01 c1 add %rax,%rcx
400422: 48 83 c1 08 add $0x8,%rcx
400426: 48 89 4d e0 mov %rcx,-0x20(%rbp)
40042a: 4c 8b 1d 5f 9f 20 00 mov 0x209f5f(%rip),%r11 #
60a390 <_GLOBAL_OFFSET_TABLE_+0x18>
400431: 49 89 0b mov %rcx,(%r11)
400434: 48 8b 45 e0 mov -0x20(%rbp),%rax
400438: 48 89 45 c8 mov %rax,-0x38(%rbp)
40043c: 48 8b 45 c8 mov -0x38(%rbp),%rax
400440: 48 89 c1 mov %rax,%rcx
400443: 48 83 c0 08 add $0x8,%rax
400447: 48 89 45 c8 mov %rax,-0x38(%rbp)
40044b: 48 8b 09 mov (%rcx),%rcx
40044e: 48 83 f9 00 cmp $0x0,%rcx
400452: 0f 84 02 00 00 00 je 40045a <_start_c+0x72>
400458: eb e2 jmp 40043c <_start_c+0x54>
40045a: 48 8b 45 c8 mov -0x38(%rbp),%rax
40045e: 4c 8b 1d 33 9f 20 00 mov 0x209f33(%rip),%r11 #
60a398 <_GLOBAL_OFFSET_TABLE_+0x20>
400465: 49 89 03 mov %rax,(%r11)
400468: 48 8b 05 31 9f 20 00 mov 0x209f31(%rip),%rax #
60a3a0 <_GLOBAL_OFFSET_TABLE_+0x28>
40046f: 48 89 45 d0 mov %rax,-0x30(%rbp)
400473: 48 8b 45 d0 mov -0x30(%rbp),%rax
400477: 48 8b 0d 2a 9f 20 00 mov 0x209f2a(%rip),%rcx #
60a3a8 <_GLOBAL_OFFSET_TABLE_+0x30>
40047e: 48 39 c8 cmp %rcx,%rax
400481: 0f 83 2a 00 00 00 jae 4004b1 <_start_c+0xc9>
400487: e9 11 00 00 00 jmpq 40049d <_start_c+0xb5>
40048c: 48 8b 45 d0 mov -0x30(%rbp),%rax
400490: 48 89 c1 mov %rax,%rcx
400493: 48 83 c0 08 add $0x8,%rax
400497: 48 89 45 d0 mov %rax,-0x30(%rbp)
40049b: eb d6 jmp 400473 <_start_c+0x8b>
40049d: 48 8b 45 d0 mov -0x30(%rbp),%rax
4004a1: 48 89 45 c0 mov %rax,-0x40(%rbp)
4004a5: 4c 8b 5d c0 mov -0x40(%rbp),%r11
4004a9: 4d 8b 1b mov (%r11),%r11
4004ac: 41 ff d3 callq *%r11
4004af: eb db jmp 40048c <_start_c+0xa4>
4004b1: 48 8b 05 f8 9e 20 00 mov 0x209ef8(%rip),%rax #
60a3b0 <_GLOBAL_OFFSET_TABLE_+0x38>
4004b8: 48 89 45 d0 mov %rax,-0x30(%rbp)
4004bc: 48 8b 45 d0 mov -0x30(%rbp),%rax
4004c0: 48 8b 0d f1 9e 20 00 mov 0x209ef1(%rip),%rcx #
60a3b8 <_GLOBAL_OFFSET_TABLE_+0x40>
4004c7: 48 39 c8 cmp %rcx,%rax
4004ca: 0f 83 2a 00 00 00 jae 4004fa <_start_c+0x112>
4004d0: e9 11 00 00 00 jmpq 4004e6 <_start_c+0xfe>
4004d5: 48 8b 45 d0 mov -0x30(%rbp),%rax
4004d9: 48 89 c1 mov %rax,%rcx
4004dc: 48 83 c0 08 add $0x8,%rax
4004e0: 48 89 45 d0 mov %rax,-0x30(%rbp)
4004e4: eb d6 jmp 4004bc <_start_c+0xd4>
4004e6: 48 8b 45 d0 mov -0x30(%rbp),%rax
4004ea: 48 89 45 c0 mov %rax,-0x40(%rbp)
4004ee: 4c 8b 5d c0 mov -0x40(%rbp),%r11
4004f2: 4d 8b 1b mov (%r11),%r11
4004f5: 41 ff d3 callq *%r11
4004f8: eb db jmp 4004d5 <_start_c+0xed>
4004fa: 48 8b 45 e0 mov -0x20(%rbp),%rax
4004fe: 49 89 c2 mov %rax,%r10
400501: 48 8b 45 e8 mov -0x18(%rbp),%rax
400505: 48 89 c6 mov %rax,%rsi
400508: 8b 45 f0 mov -0x10(%rbp),%eax
40050b: 48 89 c7 mov %rax,%rdi
40050e: 4c 89 d2 mov %r10,%rdx
400511: e8 3b 96 00 00 callq 409b51 <main>
400516: 89 45 dc mov %eax,-0x24(%rbp)
400519: 48 8b 05 a0 9e 20 00 mov 0x209ea0(%rip),%rax #
60a3c0 <_GLOBAL_OFFSET_TABLE_+0x48>
400520: 48 89 45 d0 mov %rax,-0x30(%rbp)
400524: 48 8b 45 d0 mov -0x30(%rbp),%rax
400528: 48 8b 0d 99 9e 20 00 mov 0x209e99(%rip),%rcx #
60a3c8 <_GLOBAL_OFFSET_TABLE_+0x50>
40052f: 48 39 c8 cmp %rcx,%rax
400532: 0f 86 1c 00 00 00 jbe 400554 <_start_c+0x16c>
400538: 48 8b 45 d0 mov -0x30(%rbp),%rax
40053c: 48 83 c0 f8 add $0xfffffffffffffff8,%rax
400540: 48 89 45 d0 mov %rax,-0x30(%rbp)
400544: 48 89 45 c0 mov %rax,-0x40(%rbp)
400548: 4c 8b 5d c0 mov -0x40(%rbp),%r11
40054c: 4d 8b 1b mov (%r11),%r11
40054f: 41 ff d3 callq *%r11
400552: eb d0 jmp 400524 <_start_c+0x13c>
400554: 8b 45 dc mov -0x24(%rbp),%eax
400557: 48 89 c7 mov %rax,%rdi
40055a: e8 f2 06 00 00 callq 400c51 <exit>
40055f: c9 leaveq
400560: c3 retq
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