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| author | Amaury Pouly <amaury.pouly@gmail.com> | 2017-01-17 22:54:13 +0100 |
|---|---|---|
| committer | Amaury Pouly <amaury.pouly@gmail.com> | 2017-01-24 15:34:19 +0100 |
| commit | f3cce72269703e983e4a4e6ec8dc9217b0c2b6fe (patch) | |
| tree | dc66a06febd287a5f0d146376b69d6a4322d81f1 /utils/hwstub/stub/asm/mips/system.S | |
| parent | 07bc348c914f04657b284cb1ace92df8ef3a15d9 (diff) | |
| download | rockbox-f3cce72269703e983e4a4e6ec8dc9217b0c2b6fe.tar.gz rockbox-f3cce72269703e983e4a4e6ec8dc9217b0c2b6fe.zip | |
hwstub/jz460b: implement exception recovery
Now that we now that jz4760b implements EBASE, we can use it to rebase
exceptions to use a k1seg address, that maps to the physical address of the
TCSM0. It requires to enable HAB1 to have this translation. This most the most
inefficient way to access tighly coupled memory ever, but it works.
Change-Id: I894ca929c9835696102eb2fef44b06e6eaf96d44
Diffstat (limited to 'utils/hwstub/stub/asm/mips/system.S')
| -rw-r--r-- | utils/hwstub/stub/asm/mips/system.S | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/utils/hwstub/stub/asm/mips/system.S b/utils/hwstub/stub/asm/mips/system.S index 97b0207ec9..2d89bde096 100644 --- a/utils/hwstub/stub/asm/mips/system.S +++ b/utils/hwstub/stub/asm/mips/system.S @@ -49,6 +49,33 @@ set_data_abort_jmp: sw ra, 40(v0) jr ra move v0, zero + +/* restore context on read/write error, performs the interrupt return */ +.global restore_data_abort_jmp +restore_data_abort_jmp: +la k1, data_abort_jmp_ctx_ptr + lw s0, 0(k1) + lw s1, 4(k1) + lw s2, 8(k1) + lw s3, 12(k1) + lw s4, 16(k1) + lw s5, 20(k1) + lw s6, 24(k1) + lw s7, 28(k1) + lw sp, 32(k1) + lw s8, 36(k1) + lw k1, 40(k1) + mtc0 k1, C0_EPC +#ifdef CONFIG_JZ4760B + /* XBurst has a 3 interlock cycle delay, but we don't know if the interlock + * works with eret */ + nop +#else + ehb +#endif + li v0, 1 + eret + nop .set reorder #ifdef CONFIG_FLUSH_CACHES |