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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-11-29 15:36:58 +1000 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-12-03 22:10:55 -0600 |
| commit | 9c565ee6bca4b665d9d1120bfff5e88ee80615bc (patch) | |
| tree | 43f958cb7586847fb1babbf225e252afea6441f0 /asm | |
| parent | bc74922ab1ed025bf8216b49fb7b214d74de087a (diff) | |
| download | skiboot-9c565ee6bca4b665d9d1120bfff5e88ee80615bc.zip skiboot-9c565ee6bca4b665d9d1120bfff5e88ee80615bc.tar.gz skiboot-9c565ee6bca4b665d9d1120bfff5e88ee80615bc.tar.bz2 | |
asm/head: add entry/exit calls
Add entry and exit C functions that can do some more complex
checks before the opal proper call. This requires saving off
volatile registers that have arguments in them.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'asm')
| -rw-r--r-- | asm/head.S | 16 |
1 files changed, 10 insertions, 6 deletions
@@ -930,8 +930,7 @@ opal_entry: std %r1,STACK_GPR1(%r12) mr %r1,%r12 - /* May save arguments for tracing */ -#ifdef OPAL_TRACE_ENTRY + /* Save arguments because we call C */ std %r3,STACK_GPR3(%r1) std %r4,STACK_GPR4(%r1) std %r5,STACK_GPR5(%r1) @@ -940,7 +939,7 @@ opal_entry: std %r8,STACK_GPR8(%r1) std %r9,STACK_GPR9(%r1) std %r10,STACK_GPR10(%r1) -#endif + /* Save Token (r0), LR and r13 */ mflr %r12 std %r0,STACK_GPR0(%r1) @@ -967,9 +966,12 @@ opal_entry: cmpwi %r12,0 bne 3f -#ifdef OPAL_TRACE_ENTRY + /* Check entry */ mr %r3,%r1 - bl opal_trace_entry + bl opal_entry_check + cmpdi %r3,0 + bne 1f + ld %r0,STACK_GPR0(%r1) ld %r3,STACK_GPR3(%r1) ld %r4,STACK_GPR4(%r1) @@ -979,7 +981,6 @@ opal_entry: ld %r8,STACK_GPR8(%r1) ld %r9,STACK_GPR9(%r1) ld %r10,STACK_GPR10(%r1) -#endif /* OPAL_TRACE_ENTRY */ /* Convert our token into a table entry and get the * function pointer. Also check the token. @@ -997,6 +998,9 @@ opal_entry: /* Jump ! */ bctrl + mr %r4,%r1 + bl opal_exit_check + 1: ld %r12,STACK_LR(%r1) mtlr %r12 ld %r13,STACK_GPR13(%r1) |