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regs: set up mxcsr properly; arch_regs_firsttimesetup()

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Matheus
2022-09-23 21:37:04 -03:00
parent bedd2f625e
commit 9cca7891b9
3 changed files with 12 additions and 1 deletions
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src/arch/x86_64/regs.c
+6 -1
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@@ -1,12 +1,16 @@
#include <arch/regs.h>
#include <arch/msr.h>
void arch_regs_firsttimesetup(arch_regs* regs, arch_extraregs* xregs){
xregs->mxcsr = 0x1F80; // all exceptions masked
}
void arch_regs_saveextra(arch_extraregs* regs){
// user gs was swapped
regs->gsbase = rdmsr(MSR_KERNELGSBASE);
regs->fsbase = rdmsr(MSR_FSBASE);
asm("fxsave (%%rax)" : : "a"(&regs->fx[0]));
asm("stmxcsr (%%rax)" : : "a"(&regs->mxcsr));
}
void arch_regs_setupextra(arch_extraregs* regs){
@@ -14,6 +18,7 @@ void arch_regs_setupextra(arch_extraregs* regs){
wrmsr(MSR_KERNELGSBASE, regs->gsbase);
wrmsr(MSR_FSBASE, regs->fsbase);
asm("fxrstor (%%rax)" : : "a"(&regs->fx[0]));
asm("ldmxcsr (%%rax)" : : "a"(&regs->mxcsr));
}
void arch_regs_setupkernel(arch_regs* regs, void* ip, void* stack, bool interrupts){