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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;
}

57
Userland/Libraries/LibC/math.cpp
View file

@ -9,7 +9,9 @@
#include <AK/BuiltinWrappers.h>
#include <AK/ExtraMathConstants.h>
#include <AK/FPControl.h>
#ifndef AK_ARCH_AARCH64
# include <AK/FPControl.h>
#endif
#include <AK/Math.h>
#include <AK/Platform.h>
#include <AK/StdLibExtras.h>
@ -62,7 +64,7 @@ enum class RoundingMode {
template<typename T>
union FloatExtractor;
#if ARCH(I386) || ARCH(X86_64)
#if ARCH(I386) || ARCH(X86_64) || ARCH(AARCH64)
// This assumes long double is 80 bits, which is true with GCC on Intel platforms
template<>
union FloatExtractor<long double> {
@ -413,6 +415,7 @@ MAKE_AK_BACKED2(remainder);
long double truncl(long double x) NOEXCEPT
{
#ifndef AK_ARCH_AARCH64
if (fabsl(x) < LONG_LONG_MAX) {
// This is 1.6 times faster than the implementation using the "internal_to_integer"
// helper (on x86_64)
@ -425,12 +428,14 @@ long double truncl(long double x) NOEXCEPT
: [temp] "m"(temp));
return x;
}
#endif
return internal_to_integer(x, RoundingMode::ToZero);
}
double trunc(double x) NOEXCEPT
{
#ifndef AK_ARCH_AARCH64
if (fabs(x) < LONG_LONG_MAX) {
u64 temp;
asm(
@ -440,12 +445,14 @@ double trunc(double x) NOEXCEPT
: [temp] "m"(temp));
return x;
}
#endif
return internal_to_integer(x, RoundingMode::ToZero);
}
float truncf(float x) NOEXCEPT
{
#ifndef AK_ARCH_AARCH64
if (fabsf(x) < LONG_LONG_MAX) {
u64 temp;
asm(
@ -455,40 +462,60 @@ float truncf(float x) NOEXCEPT
: [temp] "m"(temp));
return x;
}
#endif
return internal_to_integer(x, RoundingMode::ToZero);
}
long double rintl(long double value)
{
#ifdef AK_ARCH_AARCH64
(void)value;
TODO_AARCH64();
#else
long double res;
asm(
"frndint\n"
: "=t"(res)
: "0"(value));
return res;
#endif
}
double rint(double value)
{
#ifdef AK_ARCH_AARCH64
(void)value;
TODO_AARCH64();
#else
double res;
asm(
"frndint\n"
: "=t"(res)
: "0"(value));
return res;
#endif
}
float rintf(float value)
{
#ifdef AK_ARCH_AARCH64
(void)value;
TODO_AARCH64();
#else
float res;
asm(
"frndint\n"
: "=t"(res)
: "0"(value));
return res;
#endif
}
long lrintl(long double value)
{
#ifdef AK_ARCH_AARCH64
(void)value;
TODO_AARCH64();
#else
long res;
asm(
"fistpl %0\n"
@ -496,9 +523,14 @@ long lrintl(long double value)
: "t"(value)
: "st");
return res;
#endif
}
long lrint(double value)
{
#ifdef AK_ARCH_AARCH64
(void)value;
TODO_AARCH64();
#else
long res;
asm(
"fistpl %0\n"
@ -506,9 +538,14 @@ long lrint(double value)
: "t"(value)
: "st");
return res;
#endif
}
long lrintf(float value)
{
#ifdef AK_ARCH_AARCH64
(void)value;
TODO_AARCH64();
#else
long res;
asm(
"fistpl %0\n"
@ -516,10 +553,15 @@ long lrintf(float value)
: "t"(value)
: "st");
return res;
#endif
}
long long llrintl(long double value)
{
#ifdef AK_ARCH_AARCH64
(void)value;
TODO_AARCH64();
#else
long long res;
asm(
"fistpq %0\n"
@ -527,9 +569,14 @@ long long llrintl(long double value)
: "t"(value)
: "st");
return res;
#endif
}
long long llrint(double value)
{
#ifdef AK_ARCH_AARCH64
(void)value;
TODO_AARCH64();
#else
long long res;
asm(
"fistpq %0\n"
@ -537,9 +584,14 @@ long long llrint(double value)
: "t"(value)
: "st");
return res;
#endif
}
long long llrintf(float value)
{
#ifdef AK_ARCH_AARCH64
(void)value;
TODO_AARCH64();
#else
long long res;
asm(
"fistpq %0\n"
@ -547,6 +599,7 @@ long long llrintf(float value)
: "t"(value)
: "st");
return res;
#endif
}
// On systems where FLT_RADIX == 2, ldexp is equivalent to scalbn

4
Userland/Libraries/LibC/pthread.cpp
View file

@ -102,6 +102,10 @@ static int create_thread(pthread_t* thread, void* (*entry)(void*), void* argumen
thread_params->rsi = (FlatPtr)argument;
thread_params->rdx = (FlatPtr)thread_params->stack_location;
thread_params->rcx = thread_params->stack_size;
#elif ARCH(AARCH64)
(void)entry;
(void)argument;
TODO_AARCH64();
#else
# error Unknown architecture
#endif

13
Userland/Libraries/LibC/string.cpp
View file

@ -136,6 +136,11 @@ void* memcpy(void* dest_ptr, void const* src_ptr, size_t n)
"rep movsb"
: "+D"(dest_ptr), "+S"(src_ptr), "+c"(n)::"memory");
return original_dest;
#elif ARCH(AARCH64)
(void)dest_ptr;
(void)src_ptr;
(void)n;
TODO_AARCH64();
#else
# error Unknown architecture
#endif
@ -168,6 +173,14 @@ void* memset(void* dest_ptr, int c, size_t n)
}
#elif ARCH(X86_64)
// For x86-64, an optimized ASM implementation is found in ./arch/x86_64/memset.S
#elif ARCH(AARCH64)
void* memset(void* dest_ptr, int c, size_t n)
{
(void)dest_ptr;
(void)c;
(void)n;
TODO_AARCH64();
}
#else
# error Unknown architecture
#endif

18
Userland/Libraries/LibC/sys/arch/i386/regs.h
View file

@ -23,8 +23,10 @@ struct [[gnu::packed]] PtraceRegisters : public __mcontext {
{
# if ARCH(I386)
return eip;
# else
# elif ARCH(X86_64)
return rip;
# else
TODO_AARCH64();
# endif
}
@ -32,8 +34,11 @@ struct [[gnu::packed]] PtraceRegisters : public __mcontext {
{
# if ARCH(I386)
eip = ip;
# else
# elif ARCH(X86_64)
rip = ip;
# else
(void)ip;
TODO_AARCH64();
# endif
}
@ -41,8 +46,10 @@ struct [[gnu::packed]] PtraceRegisters : public __mcontext {
{
# if ARCH(I386)
return ebp;
# else
# elif ARCH(X86_64)
return rbp;
# else
TODO_AARCH64();
# endif
}
@ -50,8 +57,11 @@ struct [[gnu::packed]] PtraceRegisters : public __mcontext {
{
# if ARCH(I386)
ebp = bp;
# else
# elif ARCH(X86_64)
rbp = bp;
# else
(void)bp;
TODO_AARCH64();
# endif
}
# endif