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target/mips32: pracc write cp0 status register first 

When user requested a change on cp0 status register,
it may contain changes on EXL/ERL bits, and changes on
these bits could lead to differnt behaviours on writing
to other cp0 registers.

Change-Id: Ic83039988c29c06ee134226b52de943c46d19da2
Signed-off-by: Walter Ji <walter.ji@oss.cipunited.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7914
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Walter Ji 2023-11-17 11:27:09 +08:00 committed by Antonio Borneo
parent 7ac389cf47
commit 15038ab51a
1 changed files with 5 additions and 2 deletions
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7
src/target/mips32_pracc.c
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@ -842,12 +842,12 @@ int mips32_pracc_write_regs(struct mips32_common *mips32)
}; };
uint32_t cp0_write_data[] = { uint32_t cp0_write_data[] = {
/* status */
c0rs[0],
/* lo */ /* lo */
gprs[32], gprs[32],
/* hi */ /* hi */
gprs[33], gprs[33],
/* status */
c0rs[0],
/* badvaddr */ /* badvaddr */
c0rs[1], c0rs[1],
/* cause */ /* cause */
@ -856,6 +856,9 @@ int mips32_pracc_write_regs(struct mips32_common *mips32)
c0rs[3], c0rs[3],
}; };
/* Write CP0 Status Register first, changes on EXL or ERL bits
* may lead to different behaviour on writing to other CP0 registers.
*/
for (size_t i = 0; i < ARRAY_SIZE(cp0_write_code); i++) { for (size_t i = 0; i < ARRAY_SIZE(cp0_write_code); i++) {
/* load CP0 value in $1 */ /* load CP0 value in $1 */
pracc_add_li32(&ctx, 1, cp0_write_data[i], 0); pracc_add_li32(&ctx, 1, cp0_write_data[i], 0);