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

Browse source 
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
Notes: sideshowbarker 2024-07-17 21:16:31 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/31bd5b1a02
Pull-request: https://github.com/SerenityOS/serenity/pull/15558
Reviewed-by: https://github.com/BertalanD
Reviewed-by: https://github.com/FireFox317
Reviewed-by: https://github.com/awesomekling ✅
Reviewed-by: https://github.com/linusg
17 changed files with 206 additions and 6 deletions
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1
AK/Assertions.h
View file

@ -24,4 +24,5 @@ extern "C" __attribute__((noreturn)) void ak_verification_failed(char const*);
# define VERIFY_NOT_REACHED() VERIFY(false) /* NOLINT(cert-dcl03-c,misc-static-assert) No, this can't be static_assert, it's a runtime check */
static constexpr bool TODO = false;
# define TODO() VERIFY(TODO) /* NOLINT(cert-dcl03-c,misc-static-assert) No, this can't be static_assert, it's a runtime check */
# define TODO_AARCH64() VERIFY(TODO) /* NOLINT(cert-dcl03-c,misc-static-assert) No, this can't be static_assert, it's a runtime check */
#endif

23
Tests/Kernel/crash.cpp
View file

@ -200,7 +200,14 @@ int main(int argc, char** argv)
return Crash::Failure::UnexpectedError;
u8* makeshift_esp = makeshift_stack + 2048;
#if ARCH(I386) || ARCH(X86_64)
asm volatile("mov %%eax, %%esp" ::"a"(makeshift_esp));
#elif ARCH(AARCH64)
(void)makeshift_esp;
TODO_AARCH64();
#else
# error Unknown architecture
#endif
getuid();
dbgln("Survived syscall with MAP_STACK stack");
@ -209,7 +216,14 @@ int main(int argc, char** argv)
return Crash::Failure::UnexpectedError;
u8* bad_esp = bad_stack + 2048;
#if ARCH(I386) || ARCH(X86_64)
asm volatile("mov %%eax, %%esp" ::"a"(bad_esp));
#elif ARCH(AARCH64)
(void)bad_esp;
TODO_AARCH64();
#else
# error Unknown architecture
#endif
getuid();
return Crash::Failure::DidNotCrash;
}).run(run_type);
@ -228,6 +242,9 @@ int main(int argc, char** argv)
#elif ARCH(X86_64)
asm volatile("movq %%rax, %%rsp" ::"a"(bad_esp));
asm volatile("pushq $0");
#elif ARCH(AARCH64)
(void)bad_esp;
TODO_AARCH64();
#else
# error Unknown architecture
#endif
@ -267,7 +284,13 @@ int main(int argc, char** argv)
if (do_trigger_user_mode_instruction_prevention) {
any_failures |= !Crash("Trigger x86 User Mode Instruction Prevention", []() {
#if ARCH(I386) || ARCH(X86_64)
asm volatile("str %eax");
#elif ARCH(AARCH64)
TODO_AARCH64();
#else
# error Unknown architecture
#endif
return Crash::Failure::DidNotCrash;
}).run(run_type);
}

3
Userland/Applications/CrashReporter/main.cpp
View file

@ -120,6 +120,9 @@ static TitleAndText build_cpu_registers(const ELF::Core::ThreadInfo& thread_info
builder.appendff(" r8={:p} r9={:p} r10={:p} r11={:p}\n", regs.r8, regs.r9, regs.r10, regs.r11);
builder.appendff("r12={:p} r13={:p} r14={:p} r15={:p}\n", regs.r12, regs.r13, regs.r14, regs.r15);
builder.appendff("rip={:p} rflags={:p}", regs.rip, regs.rflags);
#elif ARCH(AARCH64)
(void)regs;
TODO_AARCH64();
#else
# error Unknown architecture
#endif

6
Userland/Applications/Debugger/main.cpp
View file

@ -49,6 +49,9 @@ static void handle_print_registers(PtraceRegisters const& regs)
outln("r8 ={:p} r9 ={:p} r10={:p} r11={:p}", regs.r8, regs.r9, regs.r10, regs.r11);
outln("r12={:p} r13={:p} r14={:p} r15={:p}", regs.r12, regs.r13, regs.r14, regs.r15);
outln("rip={:p} rflags={:p}", regs.rip, regs.rflags);
#elif ARCH(AARCH64)
(void)regs;
TODO_AARCH64();
#else
# error Unknown architecture
#endif
@ -250,6 +253,9 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
const FlatPtr ip = regs.eip;
#elif ARCH(X86_64)
const FlatPtr ip = regs.rip;
#elif ARCH(AARCH64)
const FlatPtr ip = 0; // FIXME
TODO_AARCH64();
#else
# error Unknown architecture
#endif

5
Userland/DevTools/HackStudio/Debugger/RegistersModel.cpp
View file

@ -51,6 +51,8 @@ RegistersModel::RegistersModel(PtraceRegisters const& regs)
m_registers.append({ "es", regs.es });
m_registers.append({ "fs", regs.fs });
m_registers.append({ "gs", regs.gs });
#elif ARCH(AARCH64)
TODO_AARCH64();
#else
# error Unknown architecture
#endif
@ -97,6 +99,9 @@ RegistersModel::RegistersModel(PtraceRegisters const& current_regs, PtraceRegist
m_registers.append({ "es", current_regs.es, current_regs.es != previous_regs.es });
m_registers.append({ "fs", current_regs.fs, current_regs.fs != previous_regs.fs });
m_registers.append({ "gs", current_regs.gs, current_regs.gs != previous_regs.gs });
#elif ARCH(AARCH64)
(void)previous_regs;
TODO_AARCH64();
#else
# error Unknown architecture
#endif

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

4
Userland/Libraries/LibCoredump/Backtrace.cpp
View file

@ -50,6 +50,10 @@ Backtrace::Backtrace(Reader const& coredump, const ELF::Core::ThreadInfo& thread
#elif ARCH(X86_64)
auto start_bp = m_thread_info.regs.rbp;
auto start_ip = m_thread_info.regs.rip;
#elif ARCH(AARCH64)
auto start_bp = 0;
auto start_ip = 0;
TODO_AARCH64();
#else
# error Unknown architecture
#endif

2
Userland/Libraries/LibDebug/DebugInfo.cpp
View file

@ -171,6 +171,8 @@ NonnullOwnPtrVector<DebugInfo::VariableInfo> DebugInfo::get_variables_in_current
ip = regs.eip;
#elif ARCH(X86_64)
ip = regs.rip;
#elif ARCH(AARCH64)
TODO_AARCH64();
#else
# error Unknown architecture
#endif

6
Userland/Libraries/LibDebug/DebugSession.cpp
View file

@ -343,11 +343,15 @@ FlatPtr DebugSession::single_step()
// After the debuggee has stopped, we clear the TRAP flag.
auto regs = get_registers();
#if ARCH(I386) || ARCH(X86_64)
constexpr u32 TRAP_FLAG = 0x100;
#endif
#if ARCH(I386)
regs.eflags |= TRAP_FLAG;
#elif ARCH(X86_64)
regs.rflags |= TRAP_FLAG;
#elif ARCH(AARCH64)
TODO_AARCH64();
#else
# error Unknown architecture
#endif
@ -365,6 +369,8 @@ FlatPtr DebugSession::single_step()
regs.eflags &= ~(TRAP_FLAG);
#elif ARCH(X86_64)
regs.rflags &= ~(TRAP_FLAG);
#elif ARCH(AARCH64)
TODO_AARCH64();
#else
# error Unknown architecture
#endif

9
Userland/Libraries/LibDebug/DebugSession.h
View file

@ -188,6 +188,9 @@ void DebugSession::run(DesiredInitialDebugeeState initial_debugee_state, Callbac
FlatPtr current_instruction = regs.eip;
#elif ARCH(X86_64)
FlatPtr current_instruction = regs.rip;
#elif ARCH(AARCH64)
FlatPtr current_instruction;
TODO_AARCH64();
#else
# error Unknown architecture
#endif
@ -211,6 +214,9 @@ void DebugSession::run(DesiredInitialDebugeeState initial_debugee_state, Callbac
FlatPtr current_ebp = regs.ebp;
#elif ARCH(X86_64)
FlatPtr current_ebp = regs.rbp;
#elif ARCH(AARCH64)
FlatPtr current_ebp;
TODO_AARCH64();
#else
# error Unknown architecture
#endif
@ -259,6 +265,9 @@ void DebugSession::run(DesiredInitialDebugeeState initial_debugee_state, Callbac
regs.eip = breakpoint_addr;
#elif ARCH(X86_64)
regs.rip = breakpoint_addr;
#elif ARCH(AARCH64)
(void)breakpoint_addr;
TODO_AARCH64();
#else
# error Unknown architecture
#endif

4
Userland/Libraries/LibELF/DynamicLinker.cpp
View file

@ -660,7 +660,11 @@ void ELF::DynamicLinker::linker_main(String&& main_program_name, int main_progra
dbgln_if(DYNAMIC_LOAD_DEBUG, "Jumping to entry point: {:p}", entry_point_function);
if (s_do_breakpoint_trap_before_entry) {
#ifdef AK_ARCH_AARCH64
asm("brk #0");
#else
asm("int3");
#endif
}
_invoke_entry(argc, argv, envp, entry_point_function);

8
Userland/Utilities/functrace.cpp
View file

@ -66,6 +66,11 @@ static void print_syscall(PtraceRegisters& regs, size_t depth)
regs.rcx,
regs.rbx,
end_color);
#elif ARCH(AARCH64)
(void)regs;
(void)begin_color;
(void)end_color;
TODO_AARCH64();
#else
# error Unknown architecture
#endif
@ -145,6 +150,9 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
const FlatPtr ip = regs.value().eip;
#elif ARCH(X86_64)
const FlatPtr ip = regs.value().rip;
#elif ARCH(AARCH64)
const FlatPtr ip = 0; // FIXME
TODO_AARCH64();
#else
# error Unknown architecture
#endif

9
Userland/Utilities/strace.cpp
View file

@ -894,6 +894,12 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
syscall_arg_t arg1 = regs.rdx;
syscall_arg_t arg2 = regs.rcx;
syscall_arg_t arg3 = regs.rbx;
#elif ARCH(AARCH64)
syscall_arg_t syscall_index = 0; // FIXME
syscall_arg_t arg1 = 0; // FIXME
syscall_arg_t arg2 = 0; // FIXME
syscall_arg_t arg3 = 0; // FIXME
TODO_AARCH64();
#else
# error Unknown architecture
#endif
@ -910,6 +916,9 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
u32 res = regs.eax;
#elif ARCH(X86_64)
u64 res = regs.rax;
#elif ARCH(AARCH64)
u64 res = 0; // FIXME
TODO_AARCH64();
#else
# error Unknown architecture
#endif