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authorRobin Getz <robin.getz@analog.com>2009-06-17 11:18:18 -0400
committerMike Frysinger <vapier@gentoo.org>2009-07-16 01:39:39 -0400
commit1997660cea28202ece0956cd44f332ac57700138 (patch)
treefc1e567bf3119d02cd8e85ea2b1ff619eb2b2af5 /arch/blackfin/mach-common/entry.S
parent35b5c55fee08e6e4001ba98060a2d0b82f70b5f4 (diff)
Blackfin: cleanup code a bit with comments and defines
Improve the assembly with a few explanatory comments and use symbolic defines rather than numeric values for bit positions. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/mach-common/entry.S')
-rw-r--r--arch/blackfin/mach-common/entry.S12
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index 5a4e7c7fd92c..fb1795d5be2a 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -218,7 +218,7 @@ ENTRY(_ex_single_step)
218 /* Single stepping only a single instruction, so clear the trace 218 /* Single stepping only a single instruction, so clear the trace
219 * bit here. */ 219 * bit here. */
220 r7 = syscfg; 220 r7 = syscfg;
221 bitclr (r7, 0); 221 bitclr (r7, SYSCFG_SSSTEP_P);
222 syscfg = R7; 222 syscfg = R7;
223 jump _ex_trap_c; 223 jump _ex_trap_c;
224 224
@@ -251,7 +251,7 @@ ENTRY(_ex_single_step)
251 if !cc jump _bfin_return_from_exception; 251 if !cc jump _bfin_return_from_exception;
252 252
253 r7 = syscfg; 253 r7 = syscfg;
254 bitclr (r7, 0); 254 bitclr (r7, SYSCFG_SSSTEP_P); /* Turn off single step */
255 syscfg = R7; 255 syscfg = R7;
256 256
257 /* Fall through to _bfin_return_from_exception. */ 257 /* Fall through to _bfin_return_from_exception. */
@@ -342,9 +342,11 @@ ENTRY(_ex_trap_c)
342 r6 = retx; 342 r6 = retx;
343 [p5 + PDA_RETX] = r6; 343 [p5 + PDA_RETX] = r6;
344#endif 344#endif
345 /* Save the state of single stepping */
345 r6 = SYSCFG; 346 r6 = SYSCFG;
346 [p5 + PDA_SYSCFG] = r6; 347 [p5 + PDA_SYSCFG] = r6;
347 BITCLR(r6, 0); 348 /* Clear it while we handle the exception in IRQ5 mode */
349 BITCLR(r6, SYSCFG_SSSTEP_P);
348 SYSCFG = r6; 350 SYSCFG = r6;
349 351
350 /* Disable all interrupts, but make sure level 5 is enabled so 352 /* Disable all interrupts, but make sure level 5 is enabled so
@@ -367,7 +369,7 @@ ENDPROC(_ex_trap_c)
367 * exception. This is a unrecoverable event, so crash. 369 * exception. This is a unrecoverable event, so crash.
368 * Note: this cannot be ENTRY() as we jump here with "if cc jump" ... 370 * Note: this cannot be ENTRY() as we jump here with "if cc jump" ...
369 */ 371 */
370_double_fault: 372ENTRY(_double_fault)
371 /* Turn caches & protection off, to ensure we don't get any more 373 /* Turn caches & protection off, to ensure we don't get any more
372 * double exceptions 374 * double exceptions
373 */ 375 */
@@ -872,7 +874,7 @@ ENTRY(_ret_from_exception)
872 raise 15; /* raise evt15 to do signal or reschedule */ 874 raise 15; /* raise evt15 to do signal or reschedule */
8734: 8754:
874 r0 = syscfg; 876 r0 = syscfg;
875 bitclr(r0, 0); 877 bitclr(r0, SYSCFG_SSSTEP_P); /* Turn off single step */
876 syscfg = r0; 878 syscfg = r0;
8775: 8795:
878 rts; 880 rts;