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表红的3行:
r6 应该是-1,怎么变成org r0了。
149 .macro svc_entry, stack_hole=0
150 UNWIND(.fnstart )
151 UNWIND(.save {r0 - pc} )
152 sub sp, sp, #(S_FRAME_SIZE + \stack_hole - 4)
153#ifdef CONFIG_THUMB2_KERNEL
154 SPFIX( str r0, [sp] ) @ temporarily saved
155 SPFIX( mov r0, sp )
156 SPFIX( tst r0, #4 ) @ test original stack alignment
157 SPFIX( ldr r0, [sp] ) @ restored
158#else
159 SPFIX( tst sp, #4 )
160#endif
161 SPFIX( subeq sp, sp, #4 )
162 stmia sp, {r1 - r12}
163
164 ldmia r0, {r3 - r5}
165 add r7, sp, #S_SP - 4 @ here for interlock avoidance
166 mov r6, #-1 @ "" "" "" ""
167 add r2, sp, #(S_FRAME_SIZE + \stack_hole - 4)
168 SPFIX( addeq r2, r2, #4 )
169 str r3, [sp, #-4]! @ save the "real" r0 copied
170 @ from the exception stack
171
172 mov r3, lr
173
174 @
175 @ We are now ready to fill in the remaining blanks on the stack:
176 @
177 @ r2 - sp_svc
178 @ r3 - lr_svc
179 @ r4 - lr_<exception>, already fixed up for correct return/restart
180 @ r5 - spsr_<exception>
181 @ r6 - orig_r0 (see pt_regs definition in ptrace.h)
182 @
183 stmia r7, {r2 - r6}
184
185#ifdef CONFIG_TRACE_IRQFLAGS
186 bl trace_hardirqs_off
187#endif
188 .endm
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