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| author | JozanLeClerc <JozanLeClerc@noemail.net> | 2020-11-20 18:31:08 +0000 |
|---|---|---|
| committer | JozanLeClerc <JozanLeClerc@noemail.net> | 2020-11-20 18:31:08 +0000 |
| commit | c16e1a7f76d46c169f4063cfb056e6a7bb295437 (patch) | |
| tree | ffbaae69f0e064760f94f5dcf0d7da5c0d7c1d75 | |
| parent | In progress (diff) | |
| download | bsdsetsid-c16e1a7f76d46c169f4063cfb056e6a7bb295437.tar.gz bsdsetsid-c16e1a7f76d46c169f4063cfb056e6a7bb295437.tar.bz2 bsdsetsid-c16e1a7f76d46c169f4063cfb056e6a7bb295437.tar.xz bsdsetsid-c16e1a7f76d46c169f4063cfb056e6a7bb295437.tar.zst bsdsetsid-c16e1a7f76d46c169f4063cfb056e6a7bb295437.zip | |
For some reason it's bad
FossilOrigin-Name: 36252a8a5d81a5daaa6491ddd28f195d4558c3c7
| -rw-r--r-- | src/c_bsdsetsid.S | 46 | ||||
| -rw-r--r-- | src/e_err.S | 6 | ||||
| -rw-r--r-- | src/u_strlen.S | 12 |
3 files changed, 43 insertions, 21 deletions
diff --git a/src/c_bsdsetsid.S b/src/c_bsdsetsid.S index 7e1c6ae..70556a5 100644 --- a/src/c_bsdsetsid.S +++ b/src/c_bsdsetsid.S @@ -39,7 +39,7 @@ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * bsdsetsid: src/c_bsdsetsid.S - * 2020-11-20 18:18 + * 2020-11-20 19:30 * Joe * * This is the entrypoint of the program. @@ -51,6 +51,29 @@ status: .space 4, 0x0 .text .globl main +c_hex_dec: + xor %r10, %r10 + xor %r9, %r9 + xor %r8, %r8 + mov $0xa, %rbx + clc +.repeat: + xor %rdx, %rdx + idiv %rbx + or $0x0, %dl + mov $0x8, %rcx +.shift: + rcrb $0x1, %dl + rcr $0x1, %r10 + rcr $0x1, %r9 + rcr $0x1, %r8 + dec %rcx + and %rcx, %rcx + jnz .shift + and %rax, %rax + jnz .repeat + jmp c_parent_next + main: cmpb $0x1, %dil jle e_noarg @@ -67,23 +90,25 @@ main: c_parent: mov %rax, %rdi lea status, %rsi - mov $0x0, %rdx - mov $0x0, %rcx + xor %rdx, %rdx + xor %rcx, %rcx xor %rax, %rax movb $0x7, %al /* SYS_wait4 */ syscall - xor %rdi, %rdi - lea (%rsi), %rdi + mov %rsi, %rax + jmp c_hex_dec +c_parent_next: + mov %r10, %rdi movb $0x7, %al xor %rax, %rax movb $0x1, %al /* SYS_exit */ syscall c_child: - xor %rax, %rax - movb $0x93, %al /* SYS_setsid */ - syscall - jc e_setsid +# xor %rax, %rax +# movb $0x93, %al /* SYS_setsid */ +# syscall +# jc e_setsid xor %rax, %rax pop %rdx pop %rsi @@ -94,7 +119,8 @@ c_child: movb $0x3b, %al /* SYS_execve */ syscall jc e_execve - jmp c_exit + test %rax, %rax + js e_execve c_exit: xor %rdi, %rdi diff --git a/src/e_err.S b/src/e_err.S index bf5fa1d..e29e105 100644 --- a/src/e_err.S +++ b/src/e_err.S @@ -39,7 +39,7 @@ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * bsdsetsid: src/e_err.S - * 2020-11-20 16:43 + * 2020-11-20 19:10 * Joe * * General error handling happen here. @@ -96,9 +96,7 @@ e_execve: lea nl, %rdi call u_perr mov $0x4, %rdi - xor %rax, %rax - movb $0x1, %al /* SYS_exit */ - syscall + jmp e_exit e_exit: xor %rax, %rax diff --git a/src/u_strlen.S b/src/u_strlen.S index fb783ab..aaa6c02 100644 --- a/src/u_strlen.S +++ b/src/u_strlen.S @@ -39,7 +39,7 @@ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * bsdsetsid: src/u_strlen.S - * 2020-11-19 14:10 + * 2020-11-20 19:25 * Joe * * Simple implementation of strlen. @@ -50,14 +50,12 @@ u_strlen: mov %rdi, %rcx - -u_loop: +.u.loop: cmpb $0x0, (%rcx) - je u_ret + je .u.ret inc %rcx - jmp u_loop - -u_ret: + jmp .u.loop +.u.ret: sub %rdi, %rcx mov %rcx, %rax ret |