mirror of https://gitee.com/openkylin/linux.git
powerpc/xmon: Remove store_inst() for patch_instruction()
For modifying instructions in xmon, patch_instruction() can serve the same role that store_inst() is performing with the advantage of not being specific to xmon. In some places patch_instruction() is already being using followed by store_inst(). In these cases just remove the store_inst(). Otherwise replace store_inst() with patch_instruction(). Signed-off-by: Jordan Niethe <jniethe5@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Link: https://lore.kernel.org/r/20200506034050.24806-2-jniethe5@gmail.com
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@ -326,11 +326,6 @@ static inline void sync(void)
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asm volatile("sync; isync");
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}
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static inline void store_inst(void *p)
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{
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asm volatile ("dcbst 0,%0; sync; icbi 0,%0; isync" : : "r" (p));
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}
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static inline void cflush(void *p)
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{
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asm volatile ("dcbf 0,%0; icbi 0,%0" : : "r" (p));
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@ -882,8 +877,7 @@ static struct bpt *new_breakpoint(unsigned long a)
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for (bp = bpts; bp < &bpts[NBPTS]; ++bp) {
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if (!bp->enabled && atomic_read(&bp->ref_count) == 0) {
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bp->address = a;
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bp->instr[1] = bpinstr;
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store_inst(&bp->instr[1]);
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patch_instruction(&bp->instr[1], bpinstr);
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return bp;
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}
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}
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@ -895,25 +889,26 @@ static struct bpt *new_breakpoint(unsigned long a)
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static void insert_bpts(void)
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{
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int i;
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unsigned int instr;
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struct bpt *bp;
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bp = bpts;
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for (i = 0; i < NBPTS; ++i, ++bp) {
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if ((bp->enabled & (BP_TRAP|BP_CIABR)) == 0)
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continue;
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if (mread(bp->address, &bp->instr[0], 4) != 4) {
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if (mread(bp->address, &instr, 4) != 4) {
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printf("Couldn't read instruction at %lx, "
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"disabling breakpoint there\n", bp->address);
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bp->enabled = 0;
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continue;
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}
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if (IS_MTMSRD(bp->instr[0]) || IS_RFID(bp->instr[0])) {
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if (IS_MTMSRD(instr) || IS_RFID(instr)) {
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printf("Breakpoint at %lx is on an mtmsrd or rfid "
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"instruction, disabling it\n", bp->address);
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bp->enabled = 0;
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continue;
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}
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store_inst(&bp->instr[0]);
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patch_instruction(bp->instr, instr);
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if (bp->enabled & BP_CIABR)
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continue;
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if (patch_instruction((unsigned int *)bp->address,
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@ -923,7 +918,6 @@ static void insert_bpts(void)
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bp->enabled &= ~BP_TRAP;
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continue;
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}
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store_inst((void *)bp->address);
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}
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}
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@ -958,8 +952,6 @@ static void remove_bpts(void)
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(unsigned int *)bp->address, bp->instr[0]) != 0)
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printf("Couldn't remove breakpoint at %lx\n",
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bp->address);
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else
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store_inst((void *)bp->address);
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}
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}
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