diff options
Diffstat (limited to 'contrib/gdb')
| -rw-r--r-- | contrib/gdb/gdb/i386b-nat.c | 47 |
1 files changed, 41 insertions, 6 deletions
diff --git a/contrib/gdb/gdb/i386b-nat.c b/contrib/gdb/gdb/i386b-nat.c index cefb99f..2645302 100644 --- a/contrib/gdb/gdb/i386b-nat.c +++ b/contrib/gdb/gdb/i386b-nat.c @@ -150,7 +150,6 @@ i386_register_u_addr (blockend, regnum) #include "floatformat.h" #include <sys/param.h> -#include <sys/dir.h> #include <signal.h> #include <sys/ioctl.h> #include <fcntl.h> @@ -173,6 +172,37 @@ extern void print_387_status_word (); #define fpstate save87 #define U_FPSTATE(u) u.u_pcb.pcb_savefpu +static void +i387_to_double (from, to) + char *from; + char *to; +{ + long *lp; + /* push extended mode on 387 stack, then pop in double mode + * + * first, set exception masks so no error is generated - + * number will be rounded to inf or 0, if necessary + */ + asm ("pushl %eax"); /* grab a stack slot */ + asm ("fstcw (%esp)"); /* get 387 control word */ + asm ("movl (%esp),%eax"); /* save old value */ + asm ("orl $0x3f,%eax"); /* mask all exceptions */ + asm ("pushl %eax"); + asm ("fldcw (%esp)"); /* load new value into 387 */ + + asm ("movl 8(%ebp),%eax"); + asm ("fldt (%eax)"); /* push extended number on 387 stack */ + asm ("fwait"); + asm ("movl 12(%ebp),%eax"); + asm ("fstpl (%eax)"); /* pop double */ + asm ("fwait"); + + asm ("popl %eax"); /* flush modified control word */ + asm ("fnclex"); /* clear exceptions */ + asm ("fldcw (%esp)"); /* restore original control word */ + asm ("popl %eax"); /* flush saved copy */ +} + struct env387 { unsigned short control; @@ -225,12 +255,18 @@ print_387_status (status, ep) top = (ep->status >> 11) & 7; - printf_unfiltered ("regno tag msb lsb value\n"); + printf_unfiltered (" regno tag msb lsb value\n"); for (fpreg = 7; fpreg >= 0; fpreg--) { + int st_regno; double val; - printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg); + /* The physical regno `fpreg' is only relevant as an index into the + * tag word. Logical `%st' numbers are required for indexing ep->regs. + */ + st_regno = (fpreg + 8 - top) & 7; + + printf_unfiltered ("%%st(%d) %s ", st_regno, fpreg == top ? "=>" : " "); switch ((ep->tag >> (fpreg * 2)) & 3) { @@ -240,10 +276,9 @@ print_387_status (status, ep) case 3: printf_unfiltered ("empty "); break; } for (i = 9; i >= 0; i--) - printf_unfiltered ("%02x", ep->regs[fpreg][i]); + printf_unfiltered ("%02x", ep->regs[st_regno][i]); - floatformat_to_double(&floatformat_i387_ext, (char *) ep->regs[fpreg], - &val); + i387_to_double((char *) ep->regs[st_regno], (char *) &val); printf_unfiltered (" %g\n", val); } } |
