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[kernel] Add MXCSR handling, mask SIMD exceptions

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Now threads inherit their MXCSR (sans exception state bits) SIMD
settings from their creator. By default, all exceptions are masked, and
both "to zero" flags are set.
This commit is contained in:
Justin C. Miller
2023-05-21 14:48:27 -07:00
parent f215b98f74
commit da14fd123e
7 changed files with 68 additions and 9 deletions
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24
src/kernel/interrupts.cpp
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@@ -145,6 +145,30 @@ isr_handler(cpu_state *regs)
}
break;
case isr::isrSIMDFPE: {
uint32_t mxcsr = 0;
asm volatile ("stmxcsr %0" : "=m"(mxcsr));
util::format({message, sizeof(message)},
"SIMD Exception; MXCSR[%s%s%s%s%s%s%s%s%s%s%s%s%s%s rc:%d]",
(mxcsr & 0x0001) ? " IE" : "",
(mxcsr & 0x0002) ? " DE" : "",
(mxcsr & 0x0004) ? " ZE" : "",
(mxcsr & 0x0008) ? " OE" : "",
(mxcsr & 0x0010) ? " UE" : "",
(mxcsr & 0x0020) ? " PE" : "",
(mxcsr & 0x0040) ? " DAZ" : "",
(mxcsr & 0x0080) ? " IM" : "",
(mxcsr & 0x0100) ? " DM" : "",
(mxcsr & 0x0200) ? " ZM" : "",
(mxcsr & 0x0400) ? " OM" : "",
(mxcsr & 0x0800) ? " UM" : "",
(mxcsr & 0x1000) ? " PM" : "",
(mxcsr & 0x8000) ? " FTZ" : "",
((mxcsr >> 13) & 0x3));
kassert(false, message, regs);
}
break;
case isr::isrSpurious:
// No EOI for the spurious interrupt
return;