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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-06-30 12:24:58 +0000 |
|---|---|---|
| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-06-30 12:27:06 +0000 |
| commit | 33606b41d35115f887ea688b1a16f2ff85bf2fe4 (patch) | |
| tree | 406b2c7b19a087ba437c68f3dbf0b589fa1d6150 /results/scraper/launchpad-without-comments/1754038 | |
| parent | adedf8771bc4de3113041ca21bd4d0d1c0014b6a (diff) | |
| download | emulator-bug-study-33606b41d35115f887ea688b1a16f2ff85bf2fe4.tar.gz emulator-bug-study-33606b41d35115f887ea688b1a16f2ff85bf2fe4.zip | |
add launchpad bug reports without comments
Diffstat (limited to 'results/scraper/launchpad-without-comments/1754038')
| -rw-r--r-- | results/scraper/launchpad-without-comments/1754038 | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/1754038 b/results/scraper/launchpad-without-comments/1754038 new file mode 100644 index 00000000..661c98b1 --- /dev/null +++ b/results/scraper/launchpad-without-comments/1754038 @@ -0,0 +1,112 @@ +ARM M: Systick first wrap delayed (qemu-timers/icount prb?) + +When running this kind of code with qemu: + +static void SysTickISR(void) +{ + printf("SysTick\n"); +} + +void main() +{ + volatile int i, j; + printf("setup timer\n"); + *(uint32_t*) 0xE000E014 = 0x8FFFFF; //reload value + *(uint32_t*) 0xE000E018 = 0; //force reload + *(uint32_t*) 0xE000E010 = 7; //cpu clk + ISR + enable + + for (j = 0; j < 0x100; j++) { + for (i = 0; i < 0x100000; i++) + ; + printf("cnt %08x -- %8x\n", *(uint32_t*) 0xE000E018, *(uint32_t*)0xE000E010); + } +} + +I get the following output (comments added after '#'): + +setup timer +cnt 007cccca -- 7 +cnt 006998a2 -- 7 +cnt 00566479 -- 7 +cnt 0043304f -- 7 +cnt 002ffc26 -- 7 +cnt 001cc7fd -- 7 +cnt 000993d5 -- 7 +cnt 00000000 -- 7 <--- problem here, systick should wrap and raise isr +cnt 00000000 -- 7 +cnt 00000000 -- 7 +cnt 00000000 -- 7 +cnt 00000000 -- 7 +cnt 00000000 -- 7 +cnt 00000000 -- 7 +cnt 00000000 -- 7 +cnt 00000000 -- 7 +cnt 00000000 -- 7 +cnt 00000000 -- 7 +cnt 00000000 -- 7 +cnt 00000000 -- 7 +cnt 00000000 -- 7 +SysTick <--- delayed isr occuring here +cnt 000986e0 -- 10007 +SysTick +cnt 00865290 -- 10007 <---- then running fine as long as regs not modified +cnt 00731e51 -- 7 +cnt 005fea27 -- 7 +cnt 004cb5ff -- 7 +cnt 003981d6 -- 7 +cnt 00264dad -- 7 +cnt 00131984 -- 7 +SysTick +cnt 008fe545 -- 10007 +cnt 007cb106 -- 7 +cnt 00697cdd -- 7 +cnt 005648b4 -- 7 +cnt 0043148b -- 7 +cnt 002fe061 -- 7 +cnt 001cac38 -- 7 +cnt 00097810 -- 7 +SysTick +cnt 008643d6 -- 10007 +cnt 00730f97 -- 7 +cnt 005fdb6d -- 7 +cnt 004ca745 -- 7 +cnt 0039731c -- 7 +cnt 00263ef3 -- 7 +cnt 00130aca -- 7 +SysTick +cnt 008fd68b -- 10007 +cnt 007ca24c -- 7 +cnt 00696e23 -- 7 +cnt 005639fa -- 7 +cnt 004305d1 -- 7 +cnt 002fd1a8 -- 7 +cnt 001c9d7f -- 7 +cnt 00096956 -- 7 +SysTick +cnt 0086351d -- 10007 +cnt 007300dd -- 7 +cnt 005fccb4 -- 7 +cnt 004c988c -- 7 +cnt 00396463 -- 7 +cnt 00263039 -- 7 +cnt 0012fc10 -- 7 +[...] + +Command line and version: +qemu-system-arm -M lm3s6965evb -nographic -kernel hello.bin -monitor stdio -serial file:/dev/pts/6 -icount 4 -cpu cortex-m4 +QEMU 2.11.50 + +I am compiling from git repo, head is: +commit f32408f3b472a088467474ab152be3b6285b2d7b +Author: Daniel P. Berrangé <email address hidden> +Date: Tue Mar 6 13:43:17 2018 +0000 + +Config options: +./configure --target-list=arm-softmmu --enable-debug --disable-slirp --enable-tcg-interpreter --disable-blobs --disable-docs --disable-guest-agent --disable-gnutls --disable-nettle --disable-gcrypt --disable-sdl --disable-gtk --disable-vnc --disable-virtfs --disable-mpath --disable-xen --disable-brlapi --disable-curl --disable-bluez --disable-kvm --disable-hax --disable-hvf --disable-whpx --disable-rdma --disable-vde --disable-netmap --disable-linux-aio --disable-cap-ng --disable-attr --disable-vhost-net --disable-spice --disable-rbd --disable-libiscsi --disable-libnfs --disable-smartcard --disable-libusb --disable-live-block-migration --disable-usb-redir --disable-lzo --disable-snappy --disable-bzip2 --disable-seccomp --disable-glusterfs --disable-tpm --disable-libssh2 --disable-numa --disable-libxml2 --disable-tcmalloc --disable-jemalloc --disable-replication --disable-vhost-vsock --disable-opengl --disable-virglrenderer --disable-xfsctl --disable-qom-cast-debug --disable-vxhs --disable-crypto-afalg --disable-vhost-user --disable-capstone --disable-pie --extra-cflags=-mtune=native + + +Not working with git tag 2.10.0 (almost same config) + +Working with stock qemu-arm 2.5.0 from Ubuntu 16.04. + +I started investigating, though I am not familiar with qemu code and I could see that the execution is not geting out of qemu_tcg_rr_cpu_thread_fn() 'while' loop and timers are not triggered because the values in cpu->icount_extra or cpu->icount_budget are not to modified accordingly after the timer is set (host side) when the systick register is written (target side). \ No newline at end of file |