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| author | Jonathan Neuschäfer <j.neuschaefer@gmx.net> | 2016-08-11 22:49:10 +0200 |
|---|---|---|
| committer | Ronald G. Minnich <rminnich@gmail.com> | 2016-08-15 18:25:32 +0200 |
| commit | 4d6ef3ab0155ba0d7717f22b5ea5042d2a3299f7 (patch) | |
| tree | 28bf62f120bd47cf9c7ea87e2065b84b13a8dfbe | |
| parent | 28a3ee6d29738866594721c6dfc9ac25a9ef23d8 (diff) | |
arch/riscv: Set the stack pointer upon trap entry
Change-Id: I52fae62bc6cf775179963720fbcfaa9e07f6a717
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/16017
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
| -rw-r--r-- | src/arch/riscv/trap_util.S | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/arch/riscv/trap_util.S b/src/arch/riscv/trap_util.S index 82a5629f4c..5ee0fddc53 100644 --- a/src/arch/riscv/trap_util.S +++ b/src/arch/riscv/trap_util.S @@ -116,7 +116,17 @@ supervisor_trap_entry: .global trap_entry trap_entry: csrw mscratch, sp - 1:addi sp,sp,-320 + + # SMP isn't supported yet, to avoid overwriting the same stack with different + # harts that handle traps at the same time. + csrr sp, mhartid +.Lsmp_hang: + bnez sp, .Lsmp_hang + + # TODO: Use the old stack pointer (plus an offset) for exceptions in machine + # mode, to avoid overwriting stack data. + li sp, 0x8000fff0 + save_tf move a0,sp jal trap_handler |