On arm and arm64, the setjmp/longjmp implementations (in both msvcrt.dll
and ucrtbase.dll) require binaries to have proper SEH information. On
arm, we can get around this by passing NULL as the frame/ctx parameter
to _setjmp, but that doesn't work on arm64.
Work around it by providing a custom implementation of the functions
in libmingwex instead.
The arm32 implementation is authored by André Hentschel.
Signed-off-by: Martin Storsjö <[email protected]>
Signed-off-by: André Hentschel <[email protected]>
---
mingw-w64-crt/misc/mingw_getsp.S | 99 ++++++++++++++++++++++++++++++++++++++++
mingw-w64-headers/crt/setjmp.h | 4 ++
2 files changed, 103 insertions(+)
diff --git a/mingw-w64-crt/misc/mingw_getsp.S b/mingw-w64-crt/misc/mingw_getsp.S
index 97510c8..5d224d1 100644
--- a/mingw-w64-crt/misc/mingw_getsp.S
+++ b/mingw-w64-crt/misc/mingw_getsp.S
@@ -51,3 +51,102 @@ __MINGW_USYMBOL(longjmp):
jmp *__imp__longjmp
#endif
#endif /* !(defined(_ARM_) || defined(__arm__)) */
+
+#if defined(_ARM_) || defined(__arm__) || defined(_ARM64_) ||
defined(__aarch64__)
+ .globl __MINGW_USYMBOL(__mingw_setjmp)
+ .def __MINGW_USYMBOL(__mingw_setjmp); .scl 2; .type
32; .endef
+__MINGW_USYMBOL(__mingw_setjmp):
+#if defined(_ARM_) || defined(__arm__)
+ mov r1, #0
+ str r1, [r0] /* jmp_buf->Frame */
+ str r4, [r0, #0x4] /* jmp_buf->R4 */
+ str r5, [r0, #0x8] /* jmp_buf->R5 */
+ str r6, [r0, #0xc] /* jmp_buf->R6 */
+ str r7, [r0, #0x10] /* jmp_buf->R7 */
+ str r8, [r0, #0x14] /* jmp_buf->R8 */
+ str r9, [r0, #0x18] /* jmp_buf->R9 */
+ str r10, [r0, #0x1c] /* jmp_buf->R10 */
+ str r11, [r0, #0x20] /* jmp_buf->R11 */
+ str sp, [r0, #0x24] /* jmp_buf->Sp */
+ str lr, [r0, #0x28] /* jmp_buf->Pc */
+ vmrs r2, fpscr
+ str r2, [r0, #0x2c] /* jmp_buf->Fpscr */
+ vstr d8, [r0, #0x30] /* jmp_buf->D[0] */
+ vstr d9, [r0, #0x38] /* jmp_buf->D[1] */
+ vstr d10, [r0, #0x40] /* jmp_buf->D[2] */
+ vstr d11, [r0, #0x48] /* jmp_buf->D[3] */
+ vstr d12, [r0, #0x50] /* jmp_buf->D[4] */
+ vstr d13, [r0, #0x58] /* jmp_buf->D[5] */
+ vstr d14, [r0, #0x60] /* jmp_buf->D[6] */
+ vstr d15, [r0, #0x68] /* jmp_buf->D[7] */
+ mov r0, #0
+ bx lr
+#elif defined(_ARM64_) || defined(__aarch64__)
+ str xzr, [x0] /* jmp_buf->Frame */
+ stp x19, x20, [x0, #0x10] /* jmp_buf->X19, X20 */
+ stp x21, x22, [x0, #0x20] /* jmp_buf->X21, X22 */
+ stp x23, x24, [x0, #0x30] /* jmp_buf->X23, X24 */
+ stp x25, x26, [x0, #0x40] /* jmp_buf->X25, X26 */
+ stp x27, x28, [x0, #0x50] /* jmp_buf->X27, X28 */
+ stp x29, x30, [x0, #0x60] /* jmp_buf->Fp, Lr */
+ mov x2, sp
+ str x2, [x0, #0x70] /* jmp_buf->Sp */
+ mrs x2, fpcr
+ str w2, [x0, #0x78] /* jmp_buf->Fpcr */
+ mrs x2, fpsr
+ str w2, [x0, #0x7c] /* jmp_buf->Fpsr */
+ stp d8, d9, [x0, #0x80] /* jmp_buf->D[0-1] */
+ stp d10, d11, [x0, #0x90] /* jmp_buf->D[2-3] */
+ stp d12, d13, [x0, #0xa0] /* jmp_buf->D[4-5] */
+ stp d14, d15, [x0, #0xb0] /* jmp_buf->D[6-7] */
+ mov x0, #0
+ ret
+#endif
+
+ .globl __MINGW_USYMBOL(__mingw_longjmp)
+ .def __MINGW_USYMBOL(__mingw_longjmp); .scl 2; .type
32; .endef
+__MINGW_USYMBOL(__mingw_longjmp):
+#if defined(_ARM_) || defined(__arm__)
+ ldr r4, [r0, #0x4] /* jmp_buf->R4 */
+ ldr r5, [r0, #0x8] /* jmp_buf->R5 */
+ ldr r6, [r0, #0xc] /* jmp_buf->R6 */
+ ldr r7, [r0, #0x10] /* jmp_buf->R7 */
+ ldr r8, [r0, #0x14] /* jmp_buf->R8 */
+ ldr r9, [r0, #0x18] /* jmp_buf->R9 */
+ ldr r10, [r0, #0x1c] /* jmp_buf->R10 */
+ ldr r11, [r0, #0x20] /* jmp_buf->R11 */
+ ldr sp, [r0, #0x24] /* jmp_buf->Sp */
+ ldr r2, [r0, #0x28] /* jmp_buf->Pc */
+ ldr r3, [r0, #0x2c] /* jmp_buf->Fpscr */
+ vmsr fpscr, r3
+ vldr d8, [r0, #0x30] /* jmp_buf->D[0] */
+ vldr d9, [r0, #0x38] /* jmp_buf->D[1] */
+ vldr d10, [r0, #0x40] /* jmp_buf->D[2] */
+ vldr d11, [r0, #0x48] /* jmp_buf->D[3] */
+ vldr d12, [r0, #0x50] /* jmp_buf->D[4] */
+ vldr d13, [r0, #0x58] /* jmp_buf->D[5] */
+ vldr d14, [r0, #0x60] /* jmp_buf->D[6] */
+ vldr d15, [r0, #0x68] /* jmp_buf->D[7] */
+ mov r0, r1 /* retval */
+ bx r2
+#elif defined(_ARM64_) || defined(__aarch64__)
+ ldp x19, x20, [x0, #0x10] /* jmp_buf->X19, X20 */
+ ldp x21, x22, [x0, #0x20] /* jmp_buf->X21, X22 */
+ ldp x23, x24, [x0, #0x30] /* jmp_buf->X23, X24 */
+ ldp x25, x26, [x0, #0x40] /* jmp_buf->X25, X26 */
+ ldp x27, x28, [x0, #0x50] /* jmp_buf->X27, X28 */
+ ldp x29, x30, [x0, #0x60] /* jmp_buf->Fp, Lr */
+ ldr x2, [x0, #0x70] /* jmp_buf->Sp */
+ mov sp, x2
+ ldr w2, [x0, #0x78] /* jmp_buf->Fpcr */
+ msr fpcr, x2
+ ldr w2, [x0, #0x7c] /* jmp_buf->Fpsr */
+ msr fpsr, x2
+ ldp d8, d9, [x0, #0x80] /* jmp_buf->D[0-1] */
+ ldp d10, d11, [x0, #0x90] /* jmp_buf->D[2-3] */
+ ldp d12, d13, [x0, #0xa0] /* jmp_buf->D[4-5] */
+ ldp d14, d15, [x0, #0xb0] /* jmp_buf->D[6-7] */
+ mov x0, x1 /* retval */
+ ret
+#endif
+#endif
diff --git a/mingw-w64-headers/crt/setjmp.h b/mingw-w64-headers/crt/setjmp.h
index ec4b013..fc79f10 100644
--- a/mingw-w64-headers/crt/setjmp.h
+++ b/mingw-w64-headers/crt/setjmp.h
@@ -213,6 +213,10 @@ void * __cdecl __attribute__ ((__nothrow__)) mingw_getsp
(void);
# ifndef _INC_SETJMPEX
# if defined(_X86_) || defined(__i386__)
# define setjmp(BUF) _setjmp3((BUF), NULL)
+# elif defined(_ARM_) || defined(__arm__) || defined(_ARM64_) ||
defined(__aarch64__)
+# define setjmp(BUF) __mingw_setjmp((BUF))
+# define longjmp __mingw_longjmp
+ int __cdecl __attribute__ ((__nothrow__,__returns_twice__))
__mingw_setjmp(jmp_buf _Buf);
# else
# if (__MINGW_GCC_VERSION < 40702)
# define setjmp(BUF) _setjmp((BUF), mingw_getsp())
