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Kernel: Don't build with -mregparm=3

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It was really confusing to have different calling conventions in kernel
and userspace. Also this has prevented us from linking with libgcc.
This commit is contained in:
Andreas Kling 2019-11-06 13:03:45 +01:00
parent 01b21e5e05
commit 1c6f8d3cbd
6 changed files with 54 additions and 52 deletions
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23
Kernel/Arch/i386/CPU.h
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@ -251,16 +251,15 @@ inline u32 read_fs_u32(u32 offset)
u32 val;
asm volatile(
"movl %%fs:%a[off], %k[val]"
: [val] "=r" (val)
: [off] "ir" (offset));
: [ val ] "=r"(val)
: [ off ] "ir"(offset));
return val;
}
inline void write_fs_u32(u32 offset, u32 val)
{
asm volatile(
"movl %k[val], %%fs:%a[off]"
:: [off] "ir" (offset), [val] "ir" (val)
"movl %k[val], %%fs:%a[off]" ::[off] "ir"(offset), [ val ] "ir"(val)
: "memory");
}
@ -383,7 +382,6 @@ struct [[gnu::packed]] RegisterDump
u16 ss_if_crossRing;
};
struct [[gnu::aligned(16)]] FPUState
{
u8 buffer[512];
@ -397,8 +395,8 @@ inline constexpr u32 page_base_of(u32 address)
class CPUID {
public:
CPUID(u32 function) { asm volatile("cpuid"
: "=a"(m_eax), "=b"(m_ebx), "=c"(m_ecx), "=d"(m_edx)
: "a"(function), "c"(0)); }
: "=a"(m_eax), "=b"(m_ebx), "=c"(m_ecx), "=d"(m_edx)
: "a"(function), "c"(0)); }
u32 eax() const { return m_eax; }
u32 ebx() const { return m_ebx; }
u32 ecx() const { return m_ecx; }
@ -459,21 +457,20 @@ public:
MSR(const MSR&) = delete;
MSR& operator=(const MSR&) = delete;
MSR(uint32_t msr):
m_msr(msr)
MSR(uint32_t msr)
: m_msr(msr)
{
}
void get(u32& low, u32& high)
{
asm volatile("rdmsr"
: "=a"(low), "=d"(high)
: "c"(m_msr));
: "=a"(low), "=d"(high)
: "c"(m_msr));
}
void set(u32 low, u32 high)
{
asm volatile("wrmsr"
:: "a"(low), "d"(high), "c"(m_msr));
asm volatile("wrmsr" ::"a"(low), "d"(high), "c"(m_msr));
}
};