Signal handlers get this as the last argument.
Compatibility:This function is compatible with the following targets:
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ANSI
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EMB/RTOS
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Mac OS
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Palm OS
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Win32
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#include <signal.h>
typedef struct vregs
{
ulong pc, /* program counter */
r0, /* scratch */
1, /* stack ptr */
r2, /* TOC */
/* volatile regs */
r3, r4,r5,r6,r7,r8,r9,r10,
/* scratch regs */
r11, r12;
double f0, /* fp scratch */
/* fp volatile regs */
f1,f2,f3,f4,f5,f6,f7,f8,f9,f10,f11,f12,f13;
ulong filler1, /* place holder */
fpscr, /* fp condition codes */
ctr, xer, cr, msr, lr; /* misc. status */
}vregs;