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picorv32
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Improved start.S IRQ code

This commit is contained in:
Clifford Wolf 2015-06-28 20:52:52 +02:00
parent 21157b8f1d
commit e5e5494ca2
1 changed files with 8 additions and 3 deletions
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11
firmware/start.S
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@ -91,15 +91,15 @@ irq_vec:
addi a0, a0, %lo(irq_regs)
// arg1 = interrupt type
getq x11, q1
getq a1, q1
// call to C function
jal ra, irq
/* restore registers */
lui x1, %hi(irq_regs)
addi x1, x1, %lo(irq_regs)
// new irq_regs address returned from C code in a0
addi x1, a0, 0
lw x2, 0*4(x1)
setq q0, x2
@ -261,6 +261,11 @@ start:
/* set stack pointer */
lui sp,(64*1024)>>12
/* set gp and tp */
lui gp, %hi(0xdeadbeef)
addi gp, gp, %lo(0xdeadbeef)
addi tp, gp, 0
#ifdef ENABLE_SIEVE
/* call sieve C code */
jal ra,sieve