參數(shù)資料
型號: HIF_SPEC
英文描述: EZ-030 Demonstration Board Theory of Operation Host Interface (HIF) Specification
中文描述: 易- 030演示板的經(jīng)營理論主機接口(誘導(dǎo)因子)規(guī)格
文件頁數(shù): 89/118頁
文件大?。?/td> 356K
代理商: HIF_SPEC
Host Interface (HIF) Specification
3–65
gr125points to the
last register saved
by the HIF in the
user’s stack
User’s
Stack
signal number
Higher Addresses
Lower Addresses
gr1
gr126
PC1
PC2
CHA
CHD
CHC
ALU
OPS
gr121
Registers Saved by HIF
(rab)
(tav)
PC0
Figure 3–1.
HIF Register Preservation
At this point the execution of the HIF invokes the handler specified by the
newsig
parameter to the
signal
service. The handler is invoked with the
processor mode set to the mode of the interrupted program (either user or
supervisor mode). Depending on the nature of the interrupt (SIGINT or
SIGFPE) and the complexity of the handler, additional registers may need to
be saved. In this case, the handler must preserve the values in the indirect
pointers IPA, IPB, and IPC; the contents of the Q register; the stack frame
pointer,
lr1
; and the local register stack free bounds in
rfb
(
gr127
). In addition,
because high-level languages use global registers
gr96–gr124
as temporaries,
the user signal handler may have to save these as well.
User signal handlers can be grouped into three levels of complexity, depending
on the implementation:
The least complex are handlers that have no intention of returning control to
the user. In this case, only a few additional registers may need to be saved
(if any).
Floating-point error handlers are often more complex, where some of the
user’s context needs to be saved. In this case, probably only the indirect
pointers (IPA–IPC), the Q register, and
gr125
need be preserved. After the
error has been handled, the handler will issue one of the signal return
services listed in Table 3–7 to return control to the user’s program.
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