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sys/i386/i386/sigtramp.s
| Show First 20 Lines • Show All 91 Lines • ▼ Show 20 Lines | osigcode: | ||||
| testl $PSL_VM,SC_PS(%eax) | testl $PSL_VM,SC_PS(%eax) | ||||
| jne 9f | jne 9f | ||||
| mov SC_GS(%eax),%gs /* restore %gs */ | mov SC_GS(%eax),%gs /* restore %gs */ | ||||
| 9: | 9: | ||||
| movl $103,%eax /* 3.x SYS_sigreturn */ | movl $103,%eax /* 3.x SYS_sigreturn */ | ||||
| pushl %eax /* junk to fake return addr. */ | pushl %eax /* junk to fake return addr. */ | ||||
| int $0x80 /* enter kernel with args */ | int $0x80 /* enter kernel with args */ | ||||
| 0: jmp 0b | 0: jmp 0b | ||||
| /* | |||||
| * Our lcall $7,$0 handler remains in user mode (ring 3), since lcalls | |||||
| * don't change the interrupt mask, so if this one went directly to the | |||||
| * kernel then there would be a window with interrupts enabled in kernel | |||||
| * mode, and all interrupt handlers would have to be almost as complicated | |||||
| * as the NMI handler to support this. | |||||
| * | |||||
| * Instead, convert the lcall to an int0x80 call. The kernel does most | |||||
| * of the conversion by popping the lcall return values off the user | |||||
| * stack and returning to them instead of to here, except when the | |||||
| * conversion itself fails. Adjusting the stack here is impossible for | |||||
| * vfork() and harder for other syscalls. | |||||
| */ | |||||
| ALIGN_TEXT | |||||
| lcall_tramp: | |||||
| int $0x80 | |||||
| 1: jmp 1b | |||||
| #endif /* COMPAT_43 */ | #endif /* COMPAT_43 */ | ||||
| ALIGN_TEXT | ALIGN_TEXT | ||||
| esigcode: | esigcode: | ||||
| .data | .data | ||||
| .globl szsigcode | .globl szsigcode | ||||
| szsigcode: | szsigcode: | ||||
| .long esigcode-sigcode | .long esigcode-sigcode | ||||
| #ifdef COMPAT_FREEBSD4 | #ifdef COMPAT_FREEBSD4 | ||||
| .globl szfreebsd4_sigcode | .globl szfreebsd4_sigcode | ||||
| szfreebsd4_sigcode: | szfreebsd4_sigcode: | ||||
| .long esigcode-freebsd4_sigcode | .long esigcode-freebsd4_sigcode | ||||
| #endif | #endif | ||||
| #ifdef COMPAT_43 | #ifdef COMPAT_43 | ||||
| .globl szosigcode | .globl szosigcode | ||||
| szosigcode: | szosigcode: | ||||
| .long esigcode-osigcode | .long esigcode-osigcode | ||||
| .globl sz_lcall_tramp | |||||
| sz_lcall_tramp: | |||||
| .long esigcode-lcall_tramp | |||||
| #endif | #endif | ||||