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[CRT] Fix link issues with __ftol2 when compiling for NT6

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__ftol2 is exported from msvcrt on NT6+, not from ntdll for some reason. So native apps still need to statically link _ftol2 and _ftoul2_legacy, but apps linking to msvcrt only need to statically link _ftoul2_legacy (via msvcrtex), when on NT6+.
This commit is contained in:
Timo Kreuzer 2024-08-29 20:57:30 +03:00
parent 95c340dfb7
commit f80d978fc0
5 changed files with 81 additions and 61 deletions
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1
sdk/lib/crt/CMakeLists.txt
View file

@ -49,6 +49,7 @@ target_compile_definitions(user32_wsprintf PRIVATE _USER32_WSPRINTF)
if(MSVC AND ARCH STREQUAL "i386")
add_asm_files(ftol2_asm
math/i386/ftol2_asm.s
math/i386/ftoul2_legacy_asm.s
)
add_library(ftol2 ${ftol2_asm})
set_target_properties(ftol2 PROPERTIES LINKER_LANGUAGE "C")

66
sdk/lib/crt/math/i386/ftol2_asm.s
View file

@ -1,8 +1,10 @@
/*
* PROJECT: ReactOS CRT
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: Floating point conversion routines
* COPYRIGHT: Copyright 2024 Timo Kreuzer <timo.kreuzer@reactos.org>
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* PURPOSE: Run-Time Library
* FILE: lib/sdk/crt/math/i386/ftol2_asm.s
* PROGRAMER:
*
*/
#include <asm.inc>
@ -10,7 +12,6 @@
EXTERN __ftol:PROC
PUBLIC __ftol2
PUBLIC __ftol2_sse
PUBLIC __ftoul2_legacy
/* FUNCTIONS ***************************************************************/
.code
@ -24,59 +25,4 @@ __ftol2:
__ftol2_sse:
jmp __ftol
__real@43e0000000000000:
.quad HEX(43e0000000000000)
__ftoul2_legacy:
/* Compare the fp number, passed in st(0), against (LLONG_MAX + 1)
aka 9223372036854775808.0 (which is 0x43e0000000000000 in double format).
If it is smaller, it fits into an __int64, so we can pass it to _ftol2.
After this the original fp value has moved to st(1) */
fld qword ptr [__real@43e0000000000000]
fcom
/* Put the comparison result bits into ax */
fnstsw ax
/* Here we test the bits for c0 (0x01) and c3 (0x40).
We check the parity bit after the test. If it is set,
an even number of bits were set.
If both are 0, st(1) < st(0), i.e. our value is ok.
If both are 1, the value is NaN/Inf and we let _ftol2 handle it. */
test ah, HEX(41)
jnp __ftoul2_legacy2
/* Clean up the fp stack and forward to _ftol2 */
fstp st(0)
jmp __ftol2
__ftoul2_legacy2:
/* Subtract (LLONG_MAX + 1) from the given fp value and put the result in st(1).
st(0) = 9223372036854775808.0
st(1) = original fp value - 9223372036854775808.0 */
fsub st(1), st(0)
/* Compare the result to (LLONG_MAX + 1) again and pop the fp stack.
Here we check, whether c0 and c3 are both 0, indicating that st(0) > st(1),
i.e. fp - (LLONG_MAX + 1) < (LLONG_MAX + 1) */
fcomp
fnstsw ax
test ah, HEX(41)
jnz __ftoul2_legacy3
/* We have established that fp - (LLONG_MAX + 1) fits into an __int64,
so pass that to _ftol2 and manually add the difference to the result */
call __ftol2
add edx, HEX(80000000)
ret
__ftoul2_legacy3:
/* The value is too large, just return the error value */
xor eax, eax
mov edx, HEX(80000000)
ret
END

71
sdk/lib/crt/math/i386/ftoul2_legacy_asm.s Normal file
View file

@ -0,0 +1,71 @@
/*
* PROJECT: ReactOS CRT
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: Floating point conversion routines
* COPYRIGHT: Copyright 2024 Timo Kreuzer <timo.kreuzer@reactos.org>
*/
#include <asm.inc>
EXTERN __ftol2:PROC
/* FUNCTIONS ***************************************************************/
.code
__real@43e0000000000000:
.quad HEX(43e0000000000000)
PUBLIC __ftoul2_legacy
__ftoul2_legacy:
/* Compare the fp number, passed in st(0), against (LLONG_MAX + 1)
aka 9223372036854775808.0 (which is 0x43e0000000000000 in double format).
If it is smaller, it fits into an __int64, so we can pass it to _ftol2.
After this the original fp value has moved to st(1) */
fld qword ptr [__real@43e0000000000000]
fcom
/* Put the comparison result bits into ax */
fnstsw ax
/* Here we test the bits for c0 (0x01) and c3 (0x40).
We check the parity bit after the test. If it is set,
an even number of bits were set.
If both are 0, st(1) < st(0), i.e. our value is ok.
If both are 1, the value is NaN/Inf and we let _ftol2 handle it. */
test ah, HEX(41)
jnp __ftoul2_legacy2
/* Clean up the fp stack and forward to _ftol2 */
fstp st(0)
jmp __ftol2
__ftoul2_legacy2:
/* Subtract (LLONG_MAX + 1) from the given fp value and put the result in st(1).
st(0) = 9223372036854775808.0
st(1) = original fp value - 9223372036854775808.0 */
fsub st(1), st(0)
/* Compare the result to (LLONG_MAX + 1) again and pop the fp stack.
Here we check, whether c0 and c3 are both 0, indicating that st(0) > st(1),
i.e. fp - (LLONG_MAX + 1) < (LLONG_MAX + 1) */
fcomp
fnstsw ax
test ah, HEX(41)
jnz __ftoul2_legacy3
/* We have established that fp - (LLONG_MAX + 1) fits into an __int64,
so pass that to _ftol2 and manually add the difference to the result */
call __ftol2
add edx, HEX(80000000)
ret
__ftoul2_legacy3:
/* The value is too large, just return the error value */
xor eax, eax
mov edx, HEX(80000000)
ret
END

1
sdk/lib/crt/math/math.cmake
View file

@ -40,6 +40,7 @@ if(ARCH STREQUAL "i386")
math/i386/floor_asm.s
math/i386/ftol_asm.s
math/i386/ftol2_asm.s
math/i386/ftoul2_legacy_asm.s
math/i386/log_asm.s
math/i386/log10_asm.s
math/i386/pow_asm.s

3
sdk/lib/crt/msvcrtex.cmake
View file

@ -47,7 +47,8 @@ if(ARCH STREQUAL "i386")
endif()
if(MSVC AND DLL_EXPORT_VERSION LESS 0x600)
list(APPEND MSVCRTEX_ASM_SOURCE
except/i386/__CxxFrameHandler3.s)
except/i386/__CxxFrameHandler3.s
math/i386/ftoul2_legacy_asm.s)
list(APPEND MSVCRTEX_SOURCE
except/i386/CxxHandleV8Frame.c)
endif()