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| /freebsd-11-stable/sys/sparc64/sparc64/ | ||
| H A D | machdep.c | diff 85242 Sat Oct 20 14:36:08 MDT 2001 jake Align the symbol that demarks the end of the signal code on a 16 byte boundary. It must be on at least an 8 byte boundary so that the length of the signal code is a multiple of 8 (well aligned). The size is used in the calculation of the address of the argument and environment vectors on the user stack; getting it wrong results in the string pointers being misaligned and causes alignment faults in getenv() among other things. Allocate a regular stack frame below the signal frame on the user stack and join up the frame pointer to the previous frame. This fixes longjmp-ing out of signal handlers. Longjmp traverses the stack upwards in order to find the right frame to return to, so the frame pointers must join up seamlessly. I thought this would just work, but obviously the frame needs to be below the signal frame, not above it like before. Account for the extra space in the signal code. Preload pointers to interrupt data structures in interrupt globals. This avoids the need to load the pointers from memory in the vectored interrupt trap handler. Transfer the first 2 out registers into td_retval in setregs. We use the same registers for system call arguments as return values, so these registers got clobbered by the system call return values on return from execve. They now get clobbered by the right values. We must put the values in both the out registers in the trapframe and in td_retval because init calls exec but fails to transfer the return value into the out registers. This fixes a bug where the first exec after init would pass junk to the c runtime, instead of a pointer to the argument strings. A better solution would be to return EJUSTRETURN on success from execve. Adjust for change in pmap_bootstraps prototype. Map the message buffer after the trap table is setup. We will fault on it immediately. |
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