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mips: optimize mips_ejtag_step_disable() code

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The code is a bit large compared to mips_ejtag_step_enable().
With the mips32 xori instruction the code can be
reused.
The number of pracc accesses are reduced from 18 to 7.

Change-Id: If3974ebd64da4461c22b089796646990e68e1b72
Signed-off-by: Salvador Arroyo <sarroyofdez@yahoo.es>
Reviewed-on: http://openocd.zylin.com/944
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
This commit is contained in:
Salvador Arroyo
2012-10-30 23:15:35 +01:00
committed by Spencer Oliver
parent 115b7be426
commit 47d5f44fe0
2 changed files with 26 additions and 41 deletions
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2
src/target/mips32.h
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@@ -144,6 +144,7 @@ struct mips32_algorithm {
#define MIPS32_OP_SH 0x29
#define MIPS32_OP_SW 0x2B
#define MIPS32_OP_ORI 0x0D
#define MIPS32_OP_XORI 0x0E
#define MIPS32_OP_XOR 0x26
#define MIPS32_OP_SLTU 0x2B
#define MIPS32_OP_SRL 0x03
@@ -186,6 +187,7 @@ struct mips32_algorithm {
#define MIPS32_MTLO(reg) MIPS32_R_INST(0, reg, 0, 0, 0, MIPS32_OP_MTLO)
#define MIPS32_MTHI(reg) MIPS32_R_INST(0, reg, 0, 0, 0, MIPS32_OP_MTHI)
#define MIPS32_ORI(tar, src, val) MIPS32_I_INST(MIPS32_OP_ORI, src, tar, val)
#define MIPS32_XORI(tar, src, val) MIPS32_I_INST(MIPS32_OP_XORI, src, tar, val)
#define MIPS32_RDHWR(tar, dst) MIPS32_R_INST(MIPS32_OP_SPECIAL3, 0, tar, dst, 0, MIPS32_OP_RDHWR)
#define MIPS32_SB(reg, off, base) MIPS32_I_INST(MIPS32_OP_SB, base, reg, off)
#define MIPS32_SH(reg, off, base) MIPS32_I_INST(MIPS32_OP_SH, base, reg, off)