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[kernel] Update syscall buffer verify FAULT to show bad address #2216

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merged 1 commit into from
Feb 3, 2025
Merged

[kernel] Update syscall buffer verify FAULT to show bad address #2216

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2 changes: 1 addition & 1 deletion elks/arch/i86/mm/user.c
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@ int verfy_area(void *p, size_t len)
if (seg_verify_area(current->pid, current->t_regs.ds, offset))
return 0;

printk("FAULT\n");
printk("FAULT at user DS %04x:%04x size %u\n", current->t_regs.ds, p, len);
return -EFAULT;
}

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2 changes: 2 additions & 0 deletions libc/watcom/asm/divmod.asm
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Expand Up @@ -27,6 +27,7 @@ include struct.inc
; divides DX:AX / [BX]
; returns DX:AX with remainder in [BX]

push cx
xor cx,cx ; temp CX = 0
cmp dx,[bx] ; is upper 16 bits numerator less than denominator
jb short fast ; yes - only one DIV needed
Expand All @@ -38,6 +39,7 @@ include struct.inc
div word ptr [bx] ; AX = lower numerator / base, DX = remainder
mov [bx],dx ; store remainder
mov dx,cx ; DX = high quotient, AX = low quotient
pop cx
ret

__divmod endp
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