In trap path "trap_setup", if in trap window we will jmp to "trap_setup_kernel_spill". /* See if we are in the trap window. */ 93 andcc %t_twinmask, %t_wim, %g0 94 bne trap_setup_kernel_spill ! in trap window, clean up 95 nop 96 97 /* Trap from kernel with a window available. 98 * Just do it... 99 */ 100 jmpl %t_retpc + 0x8, %g0 ! return to caller 101 mov %t_kstack, %sp ! jump onto new stack 102 103trap_setup_kernel_spill: 104 ld [%curptr + TI_UWINMASK], %g1 105 orcc %g0, %g1, %g0 106 bne trap_setup_user_spill ! there are some user windows, yuck But where is the %curptr in line 104 is setted? the comment said #define curptr g6 /* Set after pt_regs frame is built */ but i can't find the code set %g6 in these scene. what'more, what are "user windows" like the line 106 said meaning. There need a lot of particular dealing, I am still reading it. Thanks! --- Best regards Bob Liu _________________________________________________________________ Invite your mail contacts to join your friends list with Windows Live Spaces. It's easy! http://spaces.live.com/spacesapi.aspx?wx_action=create&wx_url=/friends.aspx&mkt=en-us -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
