* sparc-stub.c: Use a seperate stack for our traps.
* Handle recursive traps. * Remove all trap init code. This needs to be done by the environment. * (set_mem_fault_trap): Call exceptionHandler() to setup this trap. * (handle_exception): See if we are at breakinst, if so, then advance PC sp that users can just step out of breakpoint(). * (case 'G'): Don't let GDB hack CWP. Also, copy saved regs to new place if SP has changed. * (case 's'): Get rid of this, we can't do it yet. * (case 't'): New command to test any old random feature. * (case 'r'): New command to reset the system. * (breakpoint): Add label to breakpoint trap instruction so that handle_exception() can detect where we are and get past the breakpoint trivially.
This commit is contained in:
Stu Grossman
parent
7cc2923a8f
commit
bfc55a5d7c
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@ -1,7 +1,30 @@
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Sat Jan 9 19:31:43 1993 Stu Grossman (grossman at cygnus.com)
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* sparc-stub.c: Use a seperate stack for our traps.
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* Handle recursive traps.
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* Remove all trap init code. This needs to be done by the
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environment.
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* (set_mem_fault_trap): Call exceptionHandler() to setup this
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trap.
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* (handle_exception): See if we are at breakinst, if so, then
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advance PC sp that users can just step out of breakpoint().
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* (case 'G'): Don't let GDB hack CWP. Also, copy saved regs to
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new place if SP has changed.
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* (case 's'): Get rid of this, we can't do it yet.
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* (case 't'): New command to test any old random feature.
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* (case 'r'): New command to reset the system.
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* (breakpoint): Add label to breakpoint trap instruction so that
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handle_exception() can detect where we are and get past the
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breakpoint trivially.
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Thu Jan 7 13:33:06 1993 Ian Lance Taylor (ian@cygnus.com)
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* mips-pinsn.c: Actual work now done by opcodes/mips-dis.c.
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Thu Jan 7 09:21:51 1993 david d `zoo' zuhn (zoo at cirdan.cygnus.com)
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* configure.in: recognise all sparclite variants
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Wed Jan 6 10:14:51 1993 Steve Chamberlain (sac@thepub.cygnus.com)
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* symfile.c: If O_BINARY isn't defined, set it to 0, call openp for
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212
gdb/sparc-stub.c
212
gdb/sparc-stub.c
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@ -99,7 +99,7 @@ extern getDebugChar(); /* read and return a single char */
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/* at least NUMREGBYTES*2 are needed for register packets */
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#define BUFMAX 2048
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static int initialized; /* boolean flag. != 0 means we've been initialized */
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static int initialized = 0; /* !0 means we've been initialized */
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static void set_mem_fault_trap();
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@ -123,27 +123,27 @@ enum regnames {G0, G1, G2, G3, G4, G5, G6, G7,
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/*************************** ASSEMBLY CODE MACROS *************************/
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/* */
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#define BREAKPOINT() asm(" ta 1");
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extern unsigned long rdtbr();
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extern void trap_low();
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asm("
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.reserve trapstack, 1000 * 4, \"bss\", 8
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.data
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.align 4
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in_trap_handler:
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.word 0
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.text
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.align 4
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! Read the TBR.
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.globl _rdtbr
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_rdtbr:
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retl
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mov %tbr, %o0
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! This function is called when any SPARC trap (except window overflow or
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! underflow) occurs. It makes sure that the invalid register window is still
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! available before jumping into C code. It will also restore the world if you
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! return from handle_exception.
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trap_low:
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.globl _trap_low
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_trap_low:
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mov %psr, %l0
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mov %wim, %l3
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@ -176,29 +176,39 @@ trap_low:
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mov %l4, %g1 ! Restore %g1
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window_fine:
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sub %fp, (16+1+6+1+72)*4, %sp ! Make room for input & locals
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sethi %hi(in_trap_handler), %l4
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ld [%lo(in_trap_handler) + %l4], %l5
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tst %l5
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bg recursive_trap
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inc %l5
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set trapstack+1000*4, %sp ! Switch to trap stack
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recursive_trap:
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st %l5, [%lo(in_trap_handler) + %l4]
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sub %sp,(16+1+6+1+72)*4,%sp ! Make room for input & locals
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! + hidden arg + arg spill
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! + doubleword alignment
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! + registers[72] local var
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std %g0, [%fp + (-72 + 0) * 4] ! registers[Gx]
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std %g2, [%fp + (-72 + 2) * 4]
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std %g4, [%fp + (-72 + 4) * 4]
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std %g6, [%fp + (-72 + 6) * 4]
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std %g0, [%sp + (24 + 0) * 4] ! registers[Gx]
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std %g2, [%sp + (24 + 2) * 4]
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std %g4, [%sp + (24 + 4) * 4]
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std %g6, [%sp + (24 + 6) * 4]
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std %i0, [%fp + (-72 + 8) * 4] ! registers[Ox]
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std %i2, [%fp + (-72 + 10) * 4]
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std %i4, [%fp + (-72 + 12) * 4]
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std %i6, [%fp + (-72 + 14) * 4]
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std %i0, [%sp + (24 + 8) * 4] ! registers[Ox]
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std %i2, [%sp + (24 + 10) * 4]
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std %i4, [%sp + (24 + 12) * 4]
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std %i6, [%sp + (24 + 14) * 4]
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! F0->F31 not implemented
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mov %y, %l4
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mov %tbr, %l5
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st %l4, [%fp + (-72 + 64) * 4] ! Y
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st %l0, [%fp + (-72 + 65) * 4] ! PSR
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st %l3, [%fp + (-72 + 66) * 4] ! WIM
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st %l5, [%fp + (-72 + 67) * 4] ! TBR
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st %l1, [%fp + (-72 + 68) * 4] ! PC
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st %l2, [%fp + (-72 + 69) * 4] ! NPC
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st %l4, [%sp + (24 + 64) * 4] ! Y
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st %l0, [%sp + (24 + 65) * 4] ! PSR
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st %l3, [%sp + (24 + 66) * 4] ! WIM
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st %l5, [%sp + (24 + 67) * 4] ! TBR
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st %l1, [%sp + (24 + 68) * 4] ! PC
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st %l2, [%sp + (24 + 69) * 4] ! NPC
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! CPSR and FPSR not impl
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@ -206,28 +216,34 @@ window_fine:
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mov %l4, %psr ! Turn on traps, disable interrupts
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call _handle_exception
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add %fp, -72 * 4, %o0 ! Pass address of registers
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add %sp, 24 * 4, %o0 ! Pass address of registers
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restore ! Ensure that previous window is valid
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save %g0, %g0, %g0 ! by causing a window_underflow trap
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! Reload all of the registers that aren't on the stack
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ld [%fp + (-72 + 1) * 4], %g1 ! registers[Gx]
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ldd [%fp + (-72 + 2) * 4], %g2
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ldd [%fp + (-72 + 4) * 4], %g4
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ldd [%fp + (-72 + 6) * 4], %g6
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ld [%sp + (24 + 1) * 4], %g1 ! registers[Gx]
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ldd [%sp + (24 + 2) * 4], %g2
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ldd [%sp + (24 + 4) * 4], %g4
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ldd [%sp + (24 + 6) * 4], %g6
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ldd [%fp + (-72 + 8) * 4], %o0 ! registers[Ox]
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ldd [%fp + (-72 + 10) * 4], %o2
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ldd [%fp + (-72 + 12) * 4], %o4
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ldd [%fp + (-72 + 14) * 4], %o6
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ldd [%sp + (24 + 8) * 4], %i0 ! registers[Ox]
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ldd [%sp + (24 + 10) * 4], %i2
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ldd [%sp + (24 + 12) * 4], %i4
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ldd [%sp + (24 + 14) * 4], %i6
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ldd [%fp + (-72 + 64) * 4], %l0 ! Y & PSR
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ldd [%fp + (-72 + 68) * 4], %l2 ! PC & NPC
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ldd [%sp + (24 + 64) * 4], %l0 ! Y & PSR
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ldd [%sp + (24 + 68) * 4], %l2 ! PC & NPC
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mov %l0, %y
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mov %l1, %psr ! Make sure that traps are disabled
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! for rett
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sethi %hi(in_trap_handler), %l4
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ld [%lo(in_trap_handler) + %l4], %l5
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dec %l5
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st %l5, [%lo(in_trap_handler) + %l4]
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jmpl %l2, %g0 ! Restore old PC
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rett %l3 ! Restore old nPC
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");
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@ -289,6 +305,11 @@ getpacket(buffer)
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{
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xmitcsum = hex(getDebugChar()) << 4;
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xmitcsum |= hex(getDebugChar());
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#if 0
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/* Humans shouldn't have to figure out checksums to type to it. */
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putDebugChar ('+');
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return;
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#endif
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if (checksum != xmitcsum)
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putDebugChar('-'); /* failed checksum */
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else
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@ -434,51 +455,15 @@ static struct hard_trap_info
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{0, 0} /* Must be last */
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};
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/* Each entry in the trap vector occupies four words. */
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struct trap_entry
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{
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unsigned long ti[4];
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};
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extern struct trap_entry fltr_proto;
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extern struct trap_entry fltr_set_mem_err;
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asm ("
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.data
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.globl _fltr_proto
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.align 4
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_fltr_proto: ! First level trap routine prototype
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sethi %hi(trap_low), %l0
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jmpl %lo(trap_low)+%l0, %g0
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nop
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nop
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! Trap handler for memory errors. This just sets mem_err to be non-zero. It
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! assumes that %l1 is non-zero. This should be safe, as it is doubtful that
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! 0 would ever contain code that could mem fault. This routine will skip
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! past the faulting instruction after setting mem_err.
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_fltr_set_mem_err:
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sethi %hi(_mem_err), %l0
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st %l1, [%l0 + %lo(_mem_err)]
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jmpl %l2, %g0
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rett %l2+4
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.text
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");
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/* Set up exception handlers for tracing and breakpoints */
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void
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set_debug_traps()
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{
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struct trap_entry *tb; /* Trap vector base address */
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struct hard_trap_info *ht;
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tb = (struct trap_entry *)(rdtbr() & ~0xfff);
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for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
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tb[ht->tt] = fltr_proto;
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exceptionHandler(ht->tt, trap_low);
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/* In case GDB is started before us, ack any packets (presumably
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"$?#xx") sitting there. */
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@ -488,20 +473,33 @@ set_debug_traps()
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initialized = 1;
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}
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asm ("
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! Trap handler for memory errors. This just sets mem_err to be non-zero. It
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! assumes that %l1 is non-zero. This should be safe, as it is doubtful that
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! 0 would ever contain code that could mem fault. This routine will skip
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! past the faulting instruction after setting mem_err.
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.text
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.align 4
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_fltr_set_mem_err:
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sethi %hi(_mem_err), %l0
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st %l1, [%l0 + %lo(_mem_err)]
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jmpl %l2, %g0
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rett %l2+4
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");
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static void
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set_mem_fault_trap(enable)
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int enable;
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{
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struct trap_entry *tb; /* Trap vector base address */
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extern void fltr_set_mem_err();
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mem_err = 0;
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tb = (struct trap_entry *)(rdtbr() & ~0xfff);
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if (enable)
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tb[9] = fltr_set_mem_err;
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exceptionHandler(9, fltr_set_mem_err);
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else
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tb[9] = fltr_proto;
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exceptionHandler(9, trap_low);
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}
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/* Convert the SPARC hardware trap type code to a unix signal number. */
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@ -553,6 +551,8 @@ hexToInt(char **ptr, int *intValue)
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* otherwise.
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*/
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extern void breakinst();
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static void
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handle_exception (registers)
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unsigned long *registers;
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@ -584,6 +584,12 @@ handle_exception (registers)
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restore
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");
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if (registers[PC] == (unsigned long)breakinst)
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{
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registers[PC] = registers[NPC];
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registers[NPC] += 4;
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}
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sp = (unsigned long *)registers[SP];
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tt = (registers[TBR] >> 4) & 0xff;
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@ -652,8 +658,7 @@ handle_exception (registers)
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{
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ptr = remcomOutBuffer;
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ptr = mem2hex((char *)registers, ptr, 16 * 4, 0); /* G & O regs */
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ptr = mem2hex(sp + 0, ptr, 8 * 4, 0); /* L regs */
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ptr = mem2hex(sp + 8, ptr, 8 * 4, 0); /* I regs */
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ptr = mem2hex(sp + 0, ptr, 16 * 4, 0); /* L & I regs */
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memset(ptr, '0', 32 * 8); /* Floating point */
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mem2hex((char *)®isters[Y],
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ptr + 32 * 4 * 2,
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@ -664,12 +669,29 @@ handle_exception (registers)
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case 'G': /* set the value of the CPU registers - return OK */
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{
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unsigned long *newsp, psr;
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psr = registers[PSR];
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ptr = &remcomInBuffer[1];
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hex2mem(ptr, (char *)registers, 16 * 4, 0); /* G & O regs */
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hex2mem(ptr + 16 * 4 * 2, sp + 0, 8 * 4, 0); /* L regs */
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hex2mem(ptr + 24 * 4 * 2, sp + 8, 8 * 4, 0); /* I regs */
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hex2mem(ptr + 16 * 4 * 2, sp + 0, 16 * 4, 0); /* L & I regs */
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hex2mem(ptr + 64 * 4 * 2, (char *)®isters[Y],
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8 * 4, 0); /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
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/* See if the stack pointer has moved. If so, then copy the saved
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locals and ins to the new location. This keeps the window
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overflow and underflow routines happy. */
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newsp = (unsigned long *)registers[SP];
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if (sp != newsp)
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sp = memcpy(newsp, sp, 16 * 4);
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/* Don't allow CWP to be modified. */
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if (psr != registers[PSR])
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registers[PSR] = (psr & 0x1f) | (registers[PSR] & ~0x1f);
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strcpy(remcomOutBuffer,"OK");
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}
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break;
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@ -712,7 +734,6 @@ handle_exception (registers)
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break;
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case 'c': /* cAA..AA Continue at address AA..AA(optional) */
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case 's': /* sAA..AA Step one instruction from AA..AA(optional) */
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/* try to read optional parameter, pc unchanged if no parm */
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ptr = &remcomInBuffer[1];
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@ -733,6 +754,16 @@ handle_exception (registers)
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/* kill the program */
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case 'k' : /* do nothing */
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break;
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#if 0
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case 't': /* Test feature */
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asm (" std %f31,[%sp]");
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break;
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#endif
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case 'r': /* Reset */
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asm ("call 0
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nop ");
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break;
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#if 0
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Disabled until we can unscrew this properly
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@ -785,6 +816,11 @@ x1: break;
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void
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breakpoint()
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{
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if (initialized)
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BREAKPOINT();
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if (!initialized)
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return;
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asm(" .globl _breakinst
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_breakinst: ta 1
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");
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}
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Loading…
Reference in New Issue