Opened 5 years ago
Closed 3 years ago
#817 closed defect (duplicate)
CPU target not set correctly for ia32 userspace
| Reported by: | Jiri Svoboda | Owned by: | |
|---|---|---|---|
| Priority: | major | Milestone: | |
| Component: | helenos-build/ia32 | Version: | mainline |
| Keywords: | Cc: | ||
| Blocker for: | Depends on: | #830 | |
| See also: |
Description
It appears that -march is not passed to compiler when building ia32 target.
This is suggested by meson/arch/ia32/meson.build line 37 which I quote:
# FIXME: enabling -march for uspace makes malloc tests crash. Investigate.
And when I compiled with i486 as processor, I found conditional move (cmove..) instructions in the vterm binary. Conditional move instructions were introduced in Pentium Pro (and are not supported by all CPUs of that family).
This means, among other things, that userspace would not work properly on older CPUs despite properly setting CPU as i486 in the build configuration.
Change History (3)
comment:1 by , 5 years ago
comment:3 by , 3 years ago
| Depends on: | → #830 |
|---|---|
| Resolution: | → duplicate |
| Status: | new → closed |
Indeed it is. Closing as duplicate of #830.
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I tried various combinations of CPU config, qemu versions and options:
qemu-system-i386 -cpu 486(works, but SHOULD NOT)qemu-system-i386 -M isapc -cpu 486(seems to work, serial console output, but no graphics)qemu-system-i386 --cpu 486(fails, as expected)Not sure about the lack of grahics output with
-M isapcbut even with that option it seems userspace tasks work, so not event {{{-M isapc -cpu 486} can be trusted to accurately restrict the CPU features to those of a 486 processor, so running in Qemu is not a valid test.