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| author | Miquel Sabaté Solà <mikisabate@gmail.com> | 2024-12-02 21:02:35 +0100 |
|---|---|---|
| committer | Miquel Sabaté Solà <mikisabate@gmail.com> | 2024-12-02 21:02:35 +0100 |
| commit | 6132623dbf3076da11cdb85c494fadd7ee0f0a93 (patch) | |
| tree | bcfeaade99c13b9a02fff282e8ef3998e405f14a /kernel/head.S | |
| parent | d4e2441ad7063ce7ca29981ca527b1aa643b0b0c (diff) | |
| download | fbos-6132623dbf3076da11cdb85c494fadd7ee0f0a93.tar.gz fbos-6132623dbf3076da11cdb85c494fadd7ee0f0a93.zip | |
Share the same stack everywhere
As documented in the code, we are not implementing any kind of memory
protection, so in theory any process (regardless if running in user or
kernel space) would be able to tamper with other processes' stack.
Hence, don't even pretend that we are separating stacks and share the
same global stack everywhere. This simplifies things a bit.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
Diffstat (limited to 'kernel/head.S')
| -rw-r--r-- | kernel/head.S | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/head.S b/kernel/head.S index 9a12833..4390cc9 100644 --- a/kernel/head.S +++ b/kernel/head.S @@ -94,11 +94,13 @@ _start_kernel: li t6, 0 csrw sscratch, 0 - // Point tp and sp to the init task. The 'tp' register will always point to - // the current process being executed, and it will be shown on debug when + // Point 'tp' to the init task. The 'tp' register will always point to the + // current process being executed, and it will be shown on debug when // printing out messages. la tp, tasks - la sp, tasks + THREAD_SIZE + + // Point 'sp' the our general stack. + la sp, stack + THREAD_SIZE // The `start_kernel` function requires an argument to be passed, which is // the pointer to the `fdt` blob. The bootloader puts this on the `a1` |