diff options
author | Christopher Faylor <me@cgf.cx> | 2000-02-17 22:39:52 +0300 |
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committer | Christopher Faylor <me@cgf.cx> | 2000-02-17 22:39:52 +0300 |
commit | 8a0efa53e44919bcf5ccb1d3353618a82afdf8bc (patch) | |
tree | 68c3dbf3f2c6fd5d49777def9914d77b5cd4589d /newlib/libc/sys/cygwin/crt0.c | |
parent | 1fd5e000ace55b323124c7e556a7a864b972a5c4 (diff) |
import newlib-2000-02-17 snapshot
Diffstat (limited to 'newlib/libc/sys/cygwin/crt0.c')
-rw-r--r-- | newlib/libc/sys/cygwin/crt0.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/newlib/libc/sys/cygwin/crt0.c b/newlib/libc/sys/cygwin/crt0.c new file mode 100644 index 000000000..d6bdd5a57 --- /dev/null +++ b/newlib/libc/sys/cygwin/crt0.c @@ -0,0 +1,49 @@ + +#ifdef __PPC__ +/* For the PowerPC, we want to make this function have its structured + exception table exception function point to something we control. */ + +extern void __cygwin_exception_handler(); +extern void mainCRTStartup(void) __attribute__((__exception__(__cygwin_exception_handler))); +#endif + +/* In the following ifdef'd i386 code, the FPU precision is set to 80 bits + and all FPU exceptions are masked. The former is needed to make long + doubles work correctly. The latter causes the FPU to generate NaNs and + Infinities instead of signals for certain operations. +*/ + +#ifdef __i386__ +#define FPU_RESERVED 0xF0C0 +#define FPU_DEFAULT 0x033f + +/* For debugging on *#!$@ windbg. bp for breakpoint. */ +int __cygwin_crt0_bp = 0; +#endif + +extern int main (int argc, char **argv); + +void +mainCRTStartup () +{ +#ifdef __i386__ + if (__cygwin_crt0_bp) + asm volatile ("int3"); + + { + volatile unsigned short cw; + + /* Get Control Word */ + __asm__ volatile ("fnstcw %0" : "=m" (cw) : ); + + /* mask in */ + cw &= FPU_RESERVED; + cw |= FPU_DEFAULT; + + /* set cw */ + __asm__ volatile ("fldcw %0" :: "m" (cw)); + } +#endif + + cygwin_crt0 (main); +} |