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AK+Userland: Stub out code that isn't currently implemented on AARCH64

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Even though this almost certainly wouldn't run properly even if we had
a working kernel for AARCH64 this at least lets us build all the
userland binaries.
This commit is contained in:
Gunnar Beutner 2022-10-12 21:55:05 +02:00 • committed by Linus Groh
parent c18c84dbfd
commit 31bd5b1a02
17 changed files with 206 additions and 6 deletions
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40
Userland/Libraries/LibC/fenv.cpp
View file

@ -10,6 +10,7 @@
// This is the size of the floating point environment image in protected mode
static_assert(sizeof(__x87_floating_point_environment) == 28);
#ifndef AK_ARCH_AARCH64
static u16 read_status_register()
{
u16 status_register;
@ -45,6 +46,7 @@ static void set_mxcsr(u32 new_mxcsr)
}
static constexpr u32 default_mxcsr_value = 0x1f80;
#endif
extern "C" {
@ -53,10 +55,14 @@ int fegetenv(fenv_t* env)
if (!env)
return 1;
#ifdef AK_ARCH_AARCH64
TODO_AARCH64();
#else
asm volatile("fnstenv %0"
: "=m"(env->__x87_fpu_env)::"memory");
env->__mxcsr = read_mxcsr();
#endif
return 0;
}
@ -66,6 +72,9 @@ int fesetenv(fenv_t const* env)
if (!env)
return 1;
#ifdef AK_ARCH_AARCH64
TODO_AARCH64();
#else
if (env == FE_DFL_ENV) {
asm volatile("finit");
set_mxcsr(default_mxcsr_value);
@ -76,6 +85,7 @@ int fesetenv(fenv_t const* env)
: "memory");
set_mxcsr(env->__mxcsr);
#endif
return 0;
}
@ -87,9 +97,13 @@ int feholdexcept(fenv_t* env)
fenv_t current_env;
fegetenv(&current_env);
#ifdef AK_ARCH_AARCH64
TODO_AARCH64();
#else
current_env.__x87_fpu_env.__status_word &= ~FE_ALL_EXCEPT;
current_env.__x87_fpu_env.__status_word &= ~(1 << 7); // Clear the "Exception Status Summary" bit
current_env.__x87_fpu_env.__control_word &= FE_ALL_EXCEPT; // Masking these bits stops the corresponding exceptions from being generated according to the Intel Programmer's Manual
#endif
fesetenv(&current_env);
@ -122,8 +136,12 @@ int fesetexceptflag(fexcept_t const* except, int exceptions)
fegetenv(&current_env);
exceptions &= FE_ALL_EXCEPT;
#ifdef AK_ARCH_AARCH64
TODO_AARCH64();
#else
current_env.__x87_fpu_env.__status_word &= exceptions;
current_env.__x87_fpu_env.__status_word &= ~(1 << 7); // Make sure exceptions don't get raised
#endif
fesetenv(&current_env);
return 0;
@ -131,8 +149,12 @@ int fesetexceptflag(fexcept_t const* except, int exceptions)
int fegetround()
{
#ifdef AK_ARCH_AARCH64
TODO_AARCH64();
#else
// There's no way to signal whether the SSE rounding mode and x87 ones are different, so we assume they're the same
return (read_status_register() >> 10) & 3;
#endif
}
int fesetround(int rounding_mode)
@ -140,6 +162,9 @@ int fesetround(int rounding_mode)
if (rounding_mode < FE_TONEAREST || rounding_mode > FE_TOWARDZERO)
return 1;
#ifdef AK_ARCH_AARCH64
TODO_AARCH64();
#else
auto control_word = read_control_word();
control_word &= ~(3 << 10);
@ -154,6 +179,8 @@ int fesetround(int rounding_mode)
set_mxcsr(mxcsr);
#endif
return 0;
}
@ -164,8 +191,12 @@ int feclearexcept(int exceptions)
fenv_t current_env;
fegetenv(&current_env);
#ifdef AK_ARCH_AARCH64
TODO_AARCH64();
#else
current_env.__x87_fpu_env.__status_word &= ~exceptions;
current_env.__x87_fpu_env.__status_word &= ~(1 << 7); // Clear the "Exception Status Summary" bit
#endif
fesetenv(&current_env);
return 0;
@ -173,10 +204,15 @@ int feclearexcept(int exceptions)
int fetestexcept(int exceptions)
{
#ifdef AK_ARCH_AARCH64
(void)exceptions;
TODO_AARCH64();
#else
u16 status_register = read_status_register() & FE_ALL_EXCEPT;
exceptions &= FE_ALL_EXCEPT;
return status_register & exceptions;
#endif
}
int feraiseexcept(int exceptions)
@ -186,6 +222,9 @@ int feraiseexcept(int exceptions)
exceptions &= FE_ALL_EXCEPT;
#ifdef AK_ARCH_AARCH64
TODO_AARCH64();
#else
// While the order in which the exceptions is raised is unspecified, FE_OVERFLOW and FE_UNDERFLOW must be raised before FE_INEXACT, so handle that case in this branch
if (exceptions & FE_INEXACT) {
env.__x87_fpu_env.__status_word &= ((u16)exceptions & ~FE_INEXACT);
@ -203,6 +242,7 @@ int feraiseexcept(int exceptions)
env.__x87_fpu_env.__status_word &= exceptions;
fesetenv(&env);
asm volatile("fwait");
#endif
return 0;
}