Make improvements

This change progresses our AARCH64 support:

- The AARCH64 build and tests are now passing
- Add 128-bit floating-point support to printf()
- Fix clone() so it initializes cosmo's x28 TLS register
- Fix TLS memory layout issue with aarch64 _Alignas vars
- Revamp microbenchmarking tools so they work on aarch64
- Make some subtle improvements to aarch64 crash reporting
- Make kisdangerous() memory checks more accurate on aarch64
- Remove sys_open() since it's not available on Linux AARCH64

This change makes general improvements to Cosmo and Redbean:

- Introduce GetHostIsa() function in Redbean
- You can now feature check using pledge(0, 0)
- You can now feature check using unveil("",0)
- Refactor some more x86-specific asm comments
- Refactor and write docs for some libm functions
- Make the mmap() API behave more similar to Linux
- Fix WIFSIGNALED() which wrongly returned true for zero
- Rename some obscure cosmo keywords from noFOO to dontFOO
This commit is contained in:
Justine Tunney 2023-06-03 08:12:13 -07:00
parent 5655c9a4e7
commit 8f522cb702
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
116 changed files with 1194 additions and 1025 deletions

View file

@ -27,6 +27,18 @@
*/
#include "libc/macros.internal.h"
// Clears floating point exception status, e.g.
//
// feclearexcept(FE_ALL_EXCEPT);
//
// @param excepts may bitwise-or the following:
// - `FE_INVALID`
// - `FE_DIVBYZERO`
// - `FE_OVERFLOW`
// - `FE_UNDERFLOW`
// - `FE_INEXACT`
// - `FE_ALL_EXCEPT` (all of the above)
// @return 0 on success, or nonzero on error
feclearexcept:
#ifdef __x86_64__
// maintain exceptions in the sse mxcsr, clear x87 exceptions
@ -53,9 +65,47 @@ feclearexcept:
msr fpsr,x1
mov w0,#0
ret
#else
#error "unsupported architecture"
#endif
.endfn feclearexcept,globl
// Checks for floating point exception.
//
// This function may be used to check the thread-local
// floating-point exception status bits, e.g.
//
// feclearexcept(FE_ALL_EXCEPT);
// volatile double x = 0, y = 1 / x;
// assert(fetestexcept(FE_ALL_EXCEPT) == FE_DIVBYZERO);
//
// @param excepts may bitwise-or the following:
// - `FE_INVALID`
// - `FE_DIVBYZERO`
// - `FE_OVERFLOW`
// - `FE_UNDERFLOW`
// - `FE_INEXACT`
// - `FE_ALL_EXCEPT` (all of the above)
// @return mask of which exception status codes are currently set,
// or zero if there aren't any floating point exceptions
fetestexcept:
#ifdef __x86_64__
and $0x3f,%edi
push %rax
stmxcsr (%rsp)
pop %rsi
fnstsw %ax
or %esi,%eax
and %edi,%eax
ret
#elif defined(__aarch64__)
and w0,w0,#0x1f
mrs x1,fpsr
and w0,w0,w1
ret
#endif
.endfn fetestexcept,globl
feraiseexcept:
#ifdef __x86_64__
and $0x3f,%edi
@ -159,21 +209,3 @@ fesetenv:
ret
#endif
.endfn fesetenv,globl
fetestexcept:
#ifdef __x86_64__
and $0x3f,%edi
push %rax
stmxcsr (%rsp)
pop %rsi
fnstsw %ax
or %esi,%eax
and %edi,%eax
ret
#elif defined(__aarch64__)
and w0,w0,#0x1f
mrs x1,fpsr
and w0,w0,w1
ret
#endif
.endfn fetestexcept,globl