diff options
Diffstat (limited to 'nuttx/arch/hc/src/m9s12/m9s12_vectors.S')
| -rwxr-xr-x | nuttx/arch/hc/src/m9s12/m9s12_vectors.S | 77 |
1 files changed, 66 insertions, 11 deletions
diff --git a/nuttx/arch/hc/src/m9s12/m9s12_vectors.S b/nuttx/arch/hc/src/m9s12/m9s12_vectors.S index f332c49a1..e69a47512 100755 --- a/nuttx/arch/hc/src/m9s12/m9s12_vectors.S +++ b/nuttx/arch/hc/src/m9s12/m9s12_vectors.S @@ -50,6 +50,7 @@ ************************************************************************************/ .globl __start + .globl up_doirq .file "m9s12_vectors.S" /************************************************************************************ @@ -73,7 +74,8 @@ .macro HANDLER, label, irqno \label: -#warning "Missing Logic" + ldab #\irqno /* Load B=IRQ number */ + bra vcommon /* Jump to common logic */ .endm /************************************************************************************ @@ -205,9 +207,24 @@ handlers: * Common IRQ handling logic * * Description: + * On entry in to vcommon: (1) The interrupt stack fram is in place, and (2) the + * IRQ number is in B. + * * On entry into an I- or X-interrupt, into an SWI, or into an undefined * instruction interrupt, the stack frame created by hardware looks like: * + * Low Address <-- SP after interrupt + * B + * A + * XH + * XL + * YH + * YL + * PCH + * High Address PCL <-- SP before interrupt + * + * This function will create the following stack frame and will call up_doirq(): + * * Low Address <-- SP after state save * [PPAGE] * [soft regisers] @@ -218,8 +235,8 @@ handlers: * TMPH * TMPL * FRAMEH - * FRAMEL <-- SP after interrupt - * CCR + * FRAMEL + * SP <-- SP after interrupt * B * A * XH @@ -227,11 +244,22 @@ handlers: * YH * YL * PCH - * High Address PCL <-- SP before interrupt + * High Address PCL <-- SP before interrupt * ************************************************************************************/ vcommon: + /* Save the IRQ number currently in B */ + + stab .Lbsave + + /* Save the SP at the time of the interrupt */ + + tfr sp, d + addd #INTFRAME_SIZE + staa 1, -sp + stab 1, -sp + /* Save the rest of the frame */ movw _.frame, 2, -sp @@ -257,9 +285,27 @@ vcommon: movb HCS12_MMC_PPAGE, 1, -sp #endif - /* Handle the IRQ */ + /* Handle the IRQ: AB=irqno, TOS=register save structure. Return value in d */ + /* SP now points o the bottom of the frame - 1 */ + + tfr sp, x + inx + std .Lspsave + std 2, -sp + + /* Recover the IRQ number and call up_doirq() */ + + ldab .Lbsave + bsr up_doirq + leas 2, sp + + /* Check if the return value in d is the same as regs parameter passed in the TOS */ + + cpd .Lspsave + beq .Lnoswitch #warning "Missing Logic" +.Lnoswitch: /* Restore registers and return */ /* Restore the PPAGE register */ @@ -277,6 +323,11 @@ vcommon: movw 2, sp+, _.d2 #endif + /* Skip over the saved stack pointer */ + + ins + ins + movw 2, sp+, _.xy movw 2, sp+, _.z movw 2, sp+, _.tmp @@ -288,6 +339,13 @@ vcommon: * .bss ************************************************************************************/ /************************************************************************************ + * Name: Temporaries used within vcommon + ************************************************************************************/ + + .comm .Lbsave, 1, 1 + .comm .Lspsave, 2, 1 + +/************************************************************************************ * Name: up_interruptstack/g_userstack * * Description: @@ -297,12 +355,9 @@ vcommon: ************************************************************************************/ #if CONFIG_ARCH_INTERRUPTSTACK > 1 - .bss - .align 2 -up_interruptstack: - .skip (CONFIG_ARCH_INTERRUPTSTACK & ~1) + .comm .up_interruptstack:, CONFIG_ARCH_INTERRUPTSTACK, 1 up_interruptstack_base: - .size up_interruptstack, .-up_interruptstack + .size up_interruptstack, .-up_interruptstack #endif - .end + .end |