diff options
Diffstat (limited to 'gitlab/issues_text/target_missing/host_missing/accel_missing/1389')
| -rw-r--r-- | gitlab/issues_text/target_missing/host_missing/accel_missing/1389 | 61 |
1 files changed, 0 insertions, 61 deletions
diff --git a/gitlab/issues_text/target_missing/host_missing/accel_missing/1389 b/gitlab/issues_text/target_missing/host_missing/accel_missing/1389 deleted file mode 100644 index 1dfcb22b2..000000000 --- a/gitlab/issues_text/target_missing/host_missing/accel_missing/1389 +++ /dev/null @@ -1,61 +0,0 @@ -Qemu 7.2.0 My hobbby bootloader seemed to stop working -Description of problem: -I wrote a BIOS bootloader and OS, but updated to QEMU 7.2.0 and now I get an exception in my bootloader. -Specifically I am getting a page fault on the first line of map_pd: -``` -next_pdpt: - ; PDPT - mov [0xa000 + rdx * 8], rax ; PDPT[rdx] -> PD - and al, 0xfc ;; clear bits 1 and 2 - - mov rcx, 0 -map_pd: - mov [rax + rcx * 8], rdi ; PD[rcx] -> rax - add rdi, 0x200000 ; maps first 512 * 0x200000 or 1 GiB - sub rsi, 1 - cmp rsi, 0 - je done_map_rest - - add rcx, 1 - cmp rcx, 512 - jb map_pd - - add rdx, 1 ; do next GiB - add rax, 0x1000 ; next PD - or rax, (1 | 2) - - jmp next_pdpt -``` -I am getting the exception: -``` -check_exception old: 0xffffffff new 0xe - 0: v=0e e=0002 i=0 cpl=0 IP=0008:0000000000001311 pc=0000000000001311 SP=0010:0000000000007bf8 CR2=000000000020c000 -RAX=000000000020c000 RBX=00000000000b8040 RCX=0000000000000000 RDX=0000000000000201 -RSI=000000000003fe00 RDI=0000008040000083 RBP=0000000000000008 RSP=0000000000007bf8 -R8 =0000000000000000 R9 =0000000000000000 R10=0000000000000000 R11=0000000000000000 -R12=0000000000000000 R13=0000000000000000 R14=0000000000000000 R15=0000000000000000 -RIP=0000000000001311 RFL=00000046 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0 -ES =0010 0000000000000000 00000000 00009300 DPL=0 DS [-WA] -CS =0008 0000000000000000 00000000 00209a00 DPL=0 CS64 [-R-] -SS =0010 0000000000000000 00000000 00009300 DPL=0 DS [-WA] -DS =0010 0000000000000000 00000000 00009300 DPL=0 DS [-WA] -FS =0010 0000000000000000 00000000 00009300 DPL=0 DS [-WA] -GS =0010 0000000000000000 00000000 00009300 DPL=0 DS [-WA] -LDT=0000 0000000000000000 0000ffff 00008200 DPL=0 LDT -TR =0000 0000000000000000 0000ffff 00008b00 DPL=0 TSS64-busy -GDT= 0000000000001888 00000018 -IDT= 0000000090909000 00000000 -CR0=80000011 CR2=000000000020c000 CR3=0000000000009000 CR4=00000020 -DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 -DR6=00000000ffff0ff0 DR7=0000000000000400 -CCS=0000000000000200 CCD=0000000000000000 CCO=LOGICB -EFER=0000000000000500 -``` - -I am able to read the 0x20c000 address with gdb -Steps to reproduce: -1. clone and build https://github.com/darbysauter/myOS -2. run with `make run` on 7.0.0 -3. run with `make run` on 7.2.0 and there is an exception -Additional information: -I looked through the changelogs from 7.1 and 7.2 and nothing stood out to me. Not sure if some behaviour changed or some default changed. |