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| author | Gabe Black <gblack@eecs.umich.edu> | 2009-06-09 23:41:03 -0700 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2009-06-09 23:41:03 -0700 |
| commit | 3ff1e922c22dcc68274b16fcce080cd69b69b47b (patch) | |
| tree | 07342655b1b6418f950fa9edffe8ca64a90e8091 /src | |
| parent | 37ac2871d5a65dfa19b63c3bed9c6622d6b8b6c9 (diff) | |
| download | gem5-3ff1e922c22dcc68274b16fcce080cd69b69b47b.tar.xz | |
ARM: Add a cmpxchg implementation to the "comm page".
This implementation does what it's supposed to (I think), but it's not atomic
and doesn't have memory barriers like the kernel's version.
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/arm/linux/process.cc | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/arch/arm/linux/process.cc b/src/arch/arm/linux/process.cc index 620bcf116..bc6388b73 100644 --- a/src/arch/arm/linux/process.cc +++ b/src/arch/arm/linux/process.cc @@ -482,6 +482,18 @@ ArmLinuxProcess::startup() swiNeg1, sizeof(swiNeg1)); } + // This -should- be atomic, but I don't think all the support that we'd + // need is implemented. There should also be memory barriers around it. + uint8_t cmpxchg[] = + { + 0x00, 0x30, 0x92, 0xe5, //ldr r3, [r2] + 0x00, 0x30, 0x53, 0xe0, //subs r3, r3, r0 + 0x00, 0x10, 0x92, 0x05, //streq r1, [r2] + 0x03, 0x00, 0xa0, 0xe1, //mov r0, r3 + 0x0e, 0xf0, 0xa0, 0xe1 //usr_ret lr + }; + tc->getMemPort()->writeBlob(commPage + 0x0fc0, cmpxchg, sizeof(cmpxchg)); + uint8_t get_tls[] = { 0x08, 0x00, 0x9f, 0xe5, //ldr r0, [pc, #(16 - 8)] |