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arch/risc-v: fix ARCH_RV32 offset for the stub lookup table calculation

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Signed-off-by: Petro Karashchenko <petro.karashchenko@gmail.com>
This commit is contained in:
Petro Karashchenko 2022-03-30 19:02:39 +02:00 committed by Xiang Xiao
parent 36b0b95eb1
commit 44ee76dcbd
1 changed files with 4 additions and 0 deletions
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4
arch/risc-v/src/common/riscv_swint.c
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@ -116,7 +116,11 @@ static void dispatch_syscall(void)
"addi sp, sp, -" STACK_FRAME_SIZE "\n" /* Create a stack frame to hold ra */
REGSTORE " ra, 0(sp)\n" /* Save ra in the stack frame */
"la t0, g_stublookup\n" /* t0=The base of the stub lookup table */
#ifdef CONFIG_ARCH_RV32
"slli a0, a0, 2\n" /* a0=Offset for the stub lookup table */
#else
"slli a0, a0, 3\n" /* a0=Offset for the stub lookup table */
#endif
"add t0, t0, a0\n" /* t0=The address in the table */
REGLOAD " t0, 0(t0)\n" /* t0=The address of the stub for this syscall */
"jalr ra, t0\n" /* Call the stub (modifies ra) */