Integrate libdyld and libunwind.

It is currently possible to run the idle experiment, and it
can raise and catch exceptions, but exceptions are not yet
propagated across RPC boundaries.

artiq/coredevice/comm_generic.py

@@ -16,7 +16,7 @@ class _H2DMsgType(Enum):
     IDENT_REQUEST = 2
     SWITCH_CLOCK = 3
 
-    LOAD_OBJECT = 4
+    LOAD_LIBRARY = 4
     RUN_KERNEL = 5
 
     RPC_REPLY = 6
@@ -124,7 +124,7 @@ class CommGeneric:
             raise IOError("Incorrect reply from device: {}".format(ty))
 
     def load(self, kcode):
-        self._write_header(len(kcode) + 9, _H2DMsgType.LOAD_OBJECT)
+        self._write_header(len(kcode) + 9, _H2DMsgType.LOAD_LIBRARY)
         self.write(kcode)
         _, ty = self._read_header()
         if ty != _D2HMsgType.LOAD_COMPLETED:

soc/runtime/Makefile

@@ -1,9 +1,15 @@
 include $(MSCDIR)/software/common.mak
 
-OBJECTS := isr.o flash_storage.o clock.o rtiocrg.o elf_loader.o services.o session.o log.o test_mode.o kloader.o bridge_ctl.o mailbox.o ksupport_data.o net_server.o moninj.o main.o
+OBJECTS := isr.o clock.o rtiocrg.o flash_storage.o mailbox.o \
-OBJECTS_KSUPPORT := ksupport.o exception_jmp.o exceptions.o mailbox.o bridge.o rtio.o ttl.o dds.o
+	session.o log.o moninj.o net_server.o bridge_ctl.o \
+	ksupport_data.o kloader.o test_mode.o main.o
+OBJECTS_KSUPPORT := ksupport.o artiq_personality.o mailbox.o \
+	bridge.o rtio.o ttl.o dds.o
 
-CFLAGS += -Ilwip/src/include -Iliblwip
+CFLAGS += -I$(MSCDIR)/software/include/dyld \
+	-I$(MSCDIR)/software/unwinder/include \
+	-I$(MSCDIR)/software/libunwind \
+	-Ilwip/src/include -Iliblwip
 
 all: runtime.bin runtime.fbi
 
@@ -19,7 +25,7 @@ all: runtime.bin runtime.fbi
 
 runtime.elf: $(OBJECTS) libs
 	$(LD) $(LDFLAGS) \
-		-T linker.ld \
+		-T runtime.ld \
 		-N -o $@ \
 		$(MSCDIR)/software/libbase/crt0-$(CPU).o \
 		$(OBJECTS) \
@@ -29,24 +35,23 @@ runtime.elf: $(OBJECTS) libs
 		-lbase -lcompiler-rt -llwip
 	@chmod -x $@
 
-ksupport.elf: $(OBJECTS_KSUPPORT)
+ksupport.elf: $(OBJECTS_KSUPPORT) libs
 	$(LD) $(LDFLAGS) \
+		--eh-frame-hdr \
 		-T ksupport.ld \
 		-N -o $@ \
 		$(MSCDIR)/software/libbase/crt0-$(CPU).o \
-		$^ \
+		$(OBJECTS_KSUPPORT) \
+		-L$(MSCDIR)/software/libbase \
 		-L$(MSCDIR)/software/libcompiler-rt \
-		-lcompiler-rt
+		-L$(MSCDIR)/software/libunwind \
+		-L$(MSCDIR)/software/libdyld \
+		-lbase -lcompiler-rt -lunwind -ldyld
 	@chmod -x $@
 
-ksupport_data.o: ksupport.bin
+ksupport_data.o: ksupport.elf
 	$(LD) -r -b binary -o $@ $<
 
-service_table.h: ksupport.elf gen_service_table.py
-	@echo " GEN     " $@ && ./gen_service_table.py ksupport.elf > $@
-
-services.c: service_table.h
-
 main.o: main.c
 	$(compile-dep)
 
@@ -58,13 +63,15 @@ main.o: main.c
 
 libs:
 	$(MAKE) -C $(MSCDIR)/software/libcompiler-rt
+	$(MAKE) -C $(MSCDIR)/software/libunwind
 	$(MAKE) -C $(MSCDIR)/software/libbase
+	$(MAKE) -C $(MSCDIR)/software/libdyld
 	$(MAKE) -C liblwip
 
 clean:
 	$(MAKE) -C liblwip clean
 	$(RM) $(OBJECTS) $(OBJECTS:.o=.d) $(OBJECTS_KSUPPORT) $(OBJECTS_KSUPPORT:.o=.d)
 	$(RM) runtime.elf runtime.bin runtime.fbi .*~ *~
-	$(RM) service_table.h ksupport.elf ksupport.bin
+	$(RM) ksupport.elf ksupport.bin
 
 .PHONY: all main.o clean libs load

soc/runtime/artiq_personality.c

@@ -246,7 +246,9 @@ struct artiq_raised_exception {
 static struct artiq_raised_exception inflight;
 
 void __artiq_raise(struct artiq_exception *artiq_exn) {
-  EH_LOG("===> raise (name=%s)", artiq_exn->name);
+  EH_LOG("===> raise (name=%s, msg=%s, params=[%lld,%lld,%lld])",
+         artiq_exn->name, artiq_exn->message,
+         artiq_exn->param[0], artiq_exn->param[1], artiq_exn->param[2]);
 
   memmove(&inflight.artiq, artiq_exn, sizeof(struct artiq_exception));
   inflight.unwind.exception_class = ARTIQ_EXCEPTION_CLASS;

soc/runtime/dds.c

@@ -1,7 +1,7 @@
 #include <generated/csr.h>
 #include <stdio.h>
 
-#include "exceptions.h"
+#include "artiq_personality.h"
 #include "rtio.h"
 #include "log.h"
 #include "dds.h"
@@ -179,7 +179,7 @@ static struct dds_set_params batch[DDS_MAX_BATCH];
 void dds_batch_enter(long long int timestamp)
 {
     if(batch_mode)
-        exception_raise(EID_DDS_BATCH_ERROR);
+        artiq_raise_from_c("DDSBatchError", "DDS batch error", 0, 0, 0);
     batch_mode = 1;
     batch_count = 0;
     batch_ref_time = timestamp;
@@ -191,7 +191,7 @@ void dds_batch_exit(void)
     int i;
 
     if(!batch_mode)
-        exception_raise(EID_DDS_BATCH_ERROR);
+        artiq_raise_from_c("DDSBatchError", "DDS batch error", 0, 0, 0);
     rtio_chan_sel_write(RTIO_DDS_CHANNEL);
     /* + FUD time */
     now = batch_ref_time - batch_count*(DURATION_PROGRAM + DURATION_WRITE);
@@ -208,7 +208,7 @@ void dds_set(long long int timestamp, int channel,
 {
     if(batch_mode) {
         if(batch_count >= DDS_MAX_BATCH)
-            exception_raise(EID_DDS_BATCH_ERROR);
+            artiq_raise_from_c("DDSBatchError", "DDS batch error", 0, 0, 0);
         /* timestamp parameter ignored (determined by batch) */
         batch[batch_count].channel = channel;
         batch[batch_count].ftw = ftw;

soc/runtime/elf_loader.c

@@ -1,240 +0,0 @@
-#include <string.h>
-
-#include "log.h"
-#include "elf_loader.h"
-
-#define EI_NIDENT 16
-
-struct elf32_ehdr {
-    unsigned char ident[EI_NIDENT];    /* ident bytes */
-    unsigned short type;               /* file type */
-    unsigned short machine;            /* target machine */
-    unsigned int version;              /* file version */
-    unsigned int entry;                /* start address */
-    unsigned int phoff;                /* phdr file offset */
-    unsigned int shoff;                /* shdr file offset */
-    unsigned int flags;                /* file flags */
-    unsigned short ehsize;             /* sizeof ehdr */
-    unsigned short phentsize;          /* sizeof phdr */
-    unsigned short phnum;              /* number phdrs */
-    unsigned short shentsize;          /* sizeof shdr */
-    unsigned short shnum;              /* number shdrs */
-    unsigned short shstrndx;           /* shdr string index */
-} __attribute__((packed));
-
-static const unsigned char elf_magic_header[] = {
-    0x7f, 0x45, 0x4c, 0x46,  /* 0x7f, 'E', 'L', 'F' */
-    0x01,                    /* Only 32-bit objects. */
-    0x02,                    /* Only big-endian. */
-    0x01,                    /* Only ELF version 1. */
-};
-
-#define ET_NONE         0       /* Unknown type. */
-#define ET_REL          1       /* Relocatable. */
-#define ET_EXEC         2       /* Executable. */
-#define ET_DYN          3       /* Shared object. */
-#define ET_CORE         4       /* Core file. */
-
-#define EM_OR1K 0x005c
-
-struct elf32_shdr {
-    unsigned int name;        /* section name */
-    unsigned int type;        /* SHT_... */
-    unsigned int flags;       /* SHF_... */
-    unsigned int addr;        /* virtual address */
-    unsigned int offset;      /* file offset */
-    unsigned int size;        /* section size */
-    unsigned int link;        /* misc info */
-    unsigned int info;        /* misc info */
-    unsigned int addralign;   /* memory alignment */
-    unsigned int entsize;     /* entry size if table */
-} __attribute__((packed));
-
-struct elf32_name {
-    char name[12];
-} __attribute__((packed));
-
-struct elf32_rela {
-    unsigned int offset;  /* Location to be relocated. */
-    unsigned int info;    /* Relocation type and symbol index. */
-    int addend;           /* Addend. */
-} __attribute__((packed));
-
-#define ELF32_R_SYM(info)  ((info) >> 8)
-#define ELF32_R_TYPE(info) ((unsigned char)(info))
-
-#define R_OR1K_INSN_REL_26 6
-
-struct elf32_sym {
-    unsigned int name;     /* String table index of name. */
-    unsigned int value;    /* Symbol value. */
-    unsigned int size;     /* Size of associated object. */
-    unsigned char info;    /* Type and binding information. */
-    unsigned char other;   /* Reserved (not used). */
-    unsigned short shndx;  /* Section index of symbol. */
-} __attribute__((packed));
-
-#define STT_NOTYPE      0
-#define STT_OBJECT      1
-#define STT_FUNC        2
-#define STT_SECTION     3
-#define STT_FILE        4
-
-#define ELF32_ST_TYPE(info) ((info) & 0x0f)
-
-
-#define SANITIZE_OFFSET_SIZE(offset, size) \
-    if(offset > 0x10000000) { \
-        log("Incorrect offset in ELF data"); \
-        return 0; \
-    } \
-    if((offset + size) > elf_length) { \
-        log("Attempted to access past the end of ELF data"); \
-        return 0; \
-    }
-
-#define GET_POINTER_SAFE(target, target_type, offset) \
-    SANITIZE_OFFSET_SIZE(offset, sizeof(target_type)); \
-    target = (target_type *)((char *)elf_data + offset)
-
-void *find_symbol(const struct symbol *symbols, const char *name)
-{
-    int i;
-
-    i = 0;
-    while((symbols[i].name != NULL) && (strcmp(symbols[i].name, name) != 0))
-        i++;
-    return symbols[i].target;
-}
-
-static int fixup(void *dest, int dest_length, struct elf32_rela *rela, void *target)
-{
-    int type, offset;
-    unsigned int *_dest = dest;
-    unsigned int *_target = target;
-
-    type = ELF32_R_TYPE(rela->info);
-    offset = rela->offset/4;
-    if(type == R_OR1K_INSN_REL_26) {
-        int val;
-
-        val = _target - (_dest + offset);
-        _dest[offset] = (_dest[offset] & 0xfc000000) | (val & 0x03ffffff);
-    } else
-        log("Unsupported relocation type: %d", type);
-    return 1;
-}
-
-int load_elf(symbol_resolver resolver, symbol_callback callback, void *elf_data, int elf_length, void *dest, int dest_length)
-{
-    struct elf32_ehdr *ehdr;
-    struct elf32_shdr *strtable;
-    unsigned int shdrptr;
-    int i;
-
-    unsigned int textoff, textsize;
-    unsigned int textrelaoff, textrelasize;
-    unsigned int symtaboff, symtabsize;
-    unsigned int strtaboff, strtabsize;
-
-
-    /* validate ELF */
-    GET_POINTER_SAFE(ehdr, struct elf32_ehdr, 0);
-    if(memcmp(ehdr->ident, elf_magic_header, sizeof(elf_magic_header)) != 0) {
-        log("Incorrect ELF header");
-        return 0;
-    }
-    if(ehdr->type != ET_REL) {
-        log("ELF is not relocatable");
-        return 0;
-    }
-    if(ehdr->machine != EM_OR1K) {
-        log("ELF is for a different machine");
-        return 0;
-    }
-
-    /* extract section info */
-    GET_POINTER_SAFE(strtable, struct elf32_shdr, ehdr->shoff + ehdr->shentsize*ehdr->shstrndx);
-    textoff = textsize = 0;
-    textrelaoff = textrelasize = 0;
-    symtaboff = symtabsize = 0;
-    strtaboff = strtabsize = 0;
-    shdrptr = ehdr->shoff;
-    for(i=0;i<ehdr->shnum;i++) {
-        struct elf32_shdr *shdr;
-        struct elf32_name *name;
-
-        GET_POINTER_SAFE(shdr, struct elf32_shdr, shdrptr);
-        GET_POINTER_SAFE(name, struct elf32_name, strtable->offset + shdr->name);
-        
-        if(strncmp(name->name, ".text", 5) == 0) {
-            textoff = shdr->offset;
-            textsize = shdr->size;
-        } else if(strncmp(name->name, ".rela.text", 10) == 0) {
-            textrelaoff = shdr->offset;
-            textrelasize = shdr->size;
-        } else if(strncmp(name->name, ".symtab", 7) == 0) {
-            symtaboff = shdr->offset;
-            symtabsize = shdr->size;
-        } else if(strncmp(name->name, ".strtab", 7) == 0) {
-            strtaboff = shdr->offset;
-            strtabsize = shdr->size;
-        }
-
-        shdrptr += ehdr->shentsize;
-    }
-    SANITIZE_OFFSET_SIZE(textoff, textsize);
-    SANITIZE_OFFSET_SIZE(textrelaoff, textrelasize);
-    SANITIZE_OFFSET_SIZE(symtaboff, symtabsize);
-    SANITIZE_OFFSET_SIZE(strtaboff, strtabsize);
-
-    /* load .text section */
-    if(textsize > dest_length) {
-        log(".text section is too large");
-        return 0;
-    }
-    memcpy(dest, (char *)elf_data + textoff, textsize);
-
-    /* process .text relocations */
-    for(i=0;i<textrelasize;i+=sizeof(struct elf32_rela)) {
-        struct elf32_rela *rela;
-        struct elf32_sym *sym;
-
-        GET_POINTER_SAFE(rela, struct elf32_rela, textrelaoff + i);
-        GET_POINTER_SAFE(sym, struct elf32_sym, symtaboff + sizeof(struct elf32_sym)*ELF32_R_SYM(rela->info));
-        if(sym->name != 0) {
-            char *name;
-            void *target;
-
-            name = (char *)elf_data + strtaboff + sym->name;
-            target = resolver(name);
-            if(target == NULL) {
-                log("Undefined symbol: %s", name);
-                return 0;
-            }
-            if(!fixup(dest, dest_length, rela, target))
-                return 0;
-        } else {
-            log("Unsupported relocation");
-            return 0;
-        }
-    }
-
-    /* list provided functions via callback */
-    for(i=0;i<symtabsize;i+=sizeof(struct elf32_sym)) {
-        struct elf32_sym *sym;
-
-        GET_POINTER_SAFE(sym, struct elf32_sym, symtaboff + i);
-        if((ELF32_ST_TYPE(sym->info) == STT_FUNC) && (sym->name != 0)) {
-            char *name;
-            void *target;
-
-            name = (char *)elf_data + strtaboff + sym->name;
-            target = (char *)dest + sym->value;
-            if(!callback(name, target))
-                return 0;
-        }
-    }
-
-    return 1;
-}

soc/runtime/elf_loader.h

@@ -1,16 +0,0 @@
-#ifndef __ELF_LOADER_H
-#define __ELF_LOADER_H
-
-struct symbol {
-    char *name;
-    void *target;
-};
-
-typedef void * (*symbol_resolver)(const char *);
-typedef int (*symbol_callback)(const char *, void *);
-
-void *find_symbol(const struct symbol *symbols, const char *name);
-/* elf_data must be aligned on a 32-bit boundary */
-int load_elf(symbol_resolver resolver, symbol_callback callback, void *elf_data, int elf_length, void *dest, int dest_length);
-
-#endif /* __ELF_LOADER_H */

soc/runtime/exception_jmp.S

@@ -1,37 +0,0 @@
-.global exception_setjmp
-.type exception_setjmp, @function
-exception_setjmp:
-    l.sw    0(r3), r1
-    l.sw    4(r3), r2
-    l.sw    8(r3), r9
-    l.sw    12(r3), r10
-    l.sw    16(r3), r14
-    l.sw    20(r3), r16
-    l.sw    24(r3), r18
-    l.sw    28(r3), r20
-    l.sw    32(r3), r22
-    l.sw    36(r3), r24
-    l.sw    40(r3), r26
-    l.sw    44(r3), r28
-    l.sw    48(r3), r30
-    l.jr    r9
-    l.ori   r11, r0, 0
-
-.global exception_longjmp
-.type exception_longjmp, @function
-exception_longjmp:
-    l.lwz   r1, 0(r3)
-    l.lwz   r2, 4(r3)
-    l.lwz   r9, 8(r3)
-    l.lwz   r10, 12(r3)
-    l.lwz   r14, 16(r3)
-    l.lwz   r16, 20(r3)
-    l.lwz   r18, 24(r3)
-    l.lwz   r20, 28(r3)
-    l.lwz   r22, 32(r3)
-    l.lwz   r24, 36(r3)
-    l.lwz   r26, 40(r3)
-    l.lwz   r28, 44(r3)
-    l.lwz   r30, 48(r3)
-    l.jr    r9
-    l.ori   r11, r0, 1

soc/runtime/exceptions.c

@@ -1,58 +0,0 @@
-#include <generated/csr.h>
-
-#include "log.h"
-#include "exceptions.h"
-
-#define MAX_EXCEPTION_CONTEXTS 64
-
-struct exception_context {
-    void *jb[13];
-};
-
-static struct exception_context exception_contexts[MAX_EXCEPTION_CONTEXTS];
-static int ec_top;
-static int stored_id;
-static long long int stored_params[3];
-
-void *exception_push(void)
-{
-    if(ec_top >= MAX_EXCEPTION_CONTEXTS)
-        exception_raise(EID_INTERNAL_ERROR);
-    return exception_contexts[ec_top++].jb;
-}
-
-void exception_pop(int levels)
-{
-    ec_top -= levels;
-}
-
-int exception_getid(long long int *eparams)
-{
-    int i;
-
-    if(eparams)
-        for(i=0;i<3;i++)
-            eparams[i] = stored_params[i];
-    return stored_id;
-}
-
-void exception_raise(int id)
-{
-    exception_raise_params(id, 0, 0, 0);
-}
-
-void exception_raise_params(int id,
-    long long int p0, long long int p1,
-    long long int p2)
-{
-    if(ec_top > 0) {
-        stored_id = id;
-        stored_params[0] = p0;
-        stored_params[1] = p1;
-        stored_params[2] = p2;
-        exception_longjmp(exception_contexts[--ec_top].jb);
-    } else {
-        log("ERROR: uncaught exception, ID=%d\n", id);
-        while(1);
-    }
-}

soc/runtime/exceptions.h

@@ -1,25 +0,0 @@
-#ifndef __EXCEPTIONS_H
-#define __EXCEPTIONS_H
-
-enum {
-    EID_NONE = 0,
-    EID_INTERNAL_ERROR = 1,
-    EID_RPC_EXCEPTION = 2,
-    EID_RTIO_UNDERFLOW = 3,
-    EID_RTIO_SEQUENCE_ERROR = 4,
-    EID_RTIO_OVERFLOW = 5,
-    EID_DDS_BATCH_ERROR = 6,
-};
-
-int exception_setjmp(void *jb) __attribute__((returns_twice));
-void exception_longjmp(void *jb) __attribute__((noreturn));
-
-void *exception_push(void);
-void exception_pop(int levels);
-int exception_getid(long long int *eparams);
-void exception_raise(int id) __attribute__((noreturn));
-void exception_raise_params(int id,
-    long long int p0, long long int p1,
-    long long int p2) __attribute__((noreturn));
-
-#endif /* __EXCEPTIONS_H */

soc/runtime/gen_service_table.py

@@ -1,65 +0,0 @@
-#!/usr/bin/env python3
-
-import sys
-
-from elftools.elf.elffile import ELFFile
-
-
-services = [
-    ("syscalls", [
-        ("now_init", "now_init"),
-        ("now_save", "now_save"),
-
-        ("watchdog_set", "watchdog_set"),
-        ("watchdog_clear", "watchdog_clear"),
-
-        ("rpc", "rpc"),
-
-        ("rtio_get_counter", "rtio_get_counter"),
-
-        ("ttl_set_o", "ttl_set_o"),
-        ("ttl_set_oe", "ttl_set_oe"),
-        ("ttl_set_sensitivity", "ttl_set_sensitivity"),
-        ("ttl_get", "ttl_get"),
-        ("ttl_clock_set", "ttl_clock_set"),
-
-        ("dds_init", "dds_init"),
-        ("dds_batch_enter", "dds_batch_enter"),
-        ("dds_batch_exit", "dds_batch_exit"),
-        ("dds_set", "dds_set"),
-    ]),
-
-    ("eh", [
-        ("setjmp", "exception_setjmp"),
-        ("push", "exception_push"),
-        ("pop", "exception_pop"),
-        ("getid", "exception_getid"),
-        ("raise", "exception_raise"),
-    ])
-]
-
-
-def print_service_table(ksupport_elf_filename):
-    with open(ksupport_elf_filename, "rb") as f:
-        elf = ELFFile(f)
-        symtab = elf.get_section_by_name(b".symtab")
-        symbols = {symbol.name: symbol.entry.st_value
-                   for symbol in symtab.iter_symbols()}
-    for name, contents in services:
-        print("static const struct symbol {}[] = {{".format(name))
-        for name, value in contents:
-            print("    {{\"{}\", (void *)0x{:08x}}},"
-                  .format(name, symbols[bytes(value, "ascii")]))
-        print("    {NULL, NULL}")
-        print("};")
-
-
-def main():
-    if len(sys.argv) == 2:
-        print_service_table(sys.argv[1])
-    else:
-        print("Incorrect number of command line arguments")
-        sys.exit(1)
-
-if __name__ == "__main__":
-    main()

soc/runtime/kloader.c

@@ -1,120 +1,82 @@
 #include <string.h>
 #include <generated/csr.h>
 
+#include <dyld.h>
+
+#include "kloader.h"
 #include "log.h"
 #include "flash_storage.h"
 #include "mailbox.h"
 #include "messages.h"
-#include "elf_loader.h"
-#include "services.h"
-#include "kloader.h"
 
-static struct symbol symtab[128];
+static void start_kernel_cpu(struct msg_load_request *msg)
-static int _symtab_count;
-static char _symtab_strings[128*16];
-static char *_symtab_strptr;
-
-static void symtab_init(void)
 {
-    memset(symtab, 0, sizeof(symtab));
+    // Stop kernel CPU before messing with its code.
-    _symtab_count = 0;
+    kernel_cpu_reset_write(1);
-    _symtab_strptr = _symtab_strings;
+
+    // Load kernel support code.
+    extern void _binary_ksupport_elf_start, _binary_ksupport_elf_end;
+    memcpy((void *)(KERNELCPU_EXEC_ADDRESS - KSUPPORT_HEADER_SIZE),
+           &_binary_ksupport_elf_start,
+           &_binary_ksupport_elf_end - &_binary_ksupport_elf_start);
+
+    // Start kernel CPU.
+    mailbox_send(msg);
+    kernel_cpu_reset_write(0);
 }
 
-static int symtab_add(const char *name, void *target)
+void kloader_start_bridge()
 {
-    if(_symtab_count >= sizeof(symtab)/sizeof(symtab[0])) {
+    start_kernel_cpu(NULL);
-        log("Too many provided symbols in object");
+}
-        symtab_init();
-        return 0;
-    }
-    symtab[_symtab_count].name = _symtab_strptr;
-    symtab[_symtab_count].target = target;
-    _symtab_count++;
 
-    while(1) {
+static int load_or_start_kernel(void *library, const char *kernel)
-        if(_symtab_strptr >= &_symtab_strings[sizeof(_symtab_strings)]) {
+{
-            log("Provided symbol string table overflow");
+    static struct dyld_info library_info;
-            symtab_init();
+    struct msg_load_request request = {
+        .library      = library,
+        .library_info = &library_info,
+        .kernel       = kernel,
+    };
+    start_kernel_cpu(&request);
+
+    struct msg_load_reply *reply = mailbox_wait_and_receive();
+    if(reply != NULL && reply->type == MESSAGE_TYPE_LOAD_REPLY) {
+        log("cannot load/run kernel: %s", reply->error);
         return 0;
     }
-        *_symtab_strptr = *name;
-        _symtab_strptr++;
-        if(*name == 0)
-            break;
-        name++;
-    }
 
     return 1;
 }
 
-int kloader_load(void *buffer, int length)
+int kloader_load_library(void *library)
 {
     if(!kernel_cpu_reset_read()) {
-        log("BUG: attempted to load while kernel CPU running");
+        log("BUG: attempted to load kernel library while kernel CPU is running");
         return 0;
     }
-    symtab_init();
+
-    return load_elf(
+    return load_or_start_kernel(library, NULL);
-        resolve_service_symbol, symtab_add,
-        buffer, length, (void *)KERNELCPU_PAYLOAD_ADDRESS, 4*1024*1024);
 }
 
-kernel_function kloader_find(const char *name)
+int kloader_start_kernel(const char *name)
 {
-    return find_symbol(symtab, name);
+    return load_or_start_kernel(NULL, name);
 }
 
-extern char _binary_ksupport_bin_start;
+int kloader_start_idle_kernel(void)
-extern char _binary_ksupport_bin_end;
-
-static void start_kernel_cpu(void *addr)
 {
-    memcpy((void *)KERNELCPU_EXEC_ADDRESS, &_binary_ksupport_bin_start,
-        &_binary_ksupport_bin_end - &_binary_ksupport_bin_start);
-    mailbox_acknowledge();
-    mailbox_send(addr);
-    kernel_cpu_reset_write(0);
-}
-
-void kloader_start_bridge(void)
-{
-    start_kernel_cpu(NULL);
-}
-
-void kloader_start_user_kernel(kernel_function k)
-{
-    if(!kernel_cpu_reset_read()) {
-        log("BUG: attempted to start kernel CPU while already running (user kernel)");
-        return;
-    }
-    start_kernel_cpu((void *)k);
-}
-
-void kloader_start_idle_kernel(void)
-{
-    char buffer[32*1024];
-    int len;
-    kernel_function k;
-
-    if(!kernel_cpu_reset_read()) {
-        log("BUG: attempted to start kernel CPU while already running (idle kernel)");
-        return;
-    }
 #if (defined CSR_SPIFLASH_BASE && defined SPIFLASH_PAGE_SIZE)
-    len = fs_read("idle_kernel", buffer, sizeof(buffer), NULL);
+    char buffer[32*1024];
-    if(len <= 0)
+    int length;
-        return;
+
-    if(!kloader_load(buffer, len)) {
+    length = fs_read("idle_kernel", buffer, sizeof(buffer), NULL);
-        log("Failed to load ELF binary for idle kernel");
+    if(length <= 0)
-        return;
+        return 0;
-    }
+
-    k = kloader_find("run");
+    return load_or_start_kernel(buffer, "test.__modinit__");
-    if(!k) {
+#else
-        log("Failed to find entry point for ELF kernel");
+    return 0;
-        return;
-    }
-    start_kernel_cpu((void *)k);
 #endif
 }
 
@@ -127,7 +89,7 @@ void kloader_stop(void)
 int kloader_validate_kpointer(void *p)
 {
     unsigned int v = (unsigned int)p;
-    if((v < 0x40400000) || (v > (0x4fffffff - 1024*1024))) {
+    if((v < KERNELCPU_EXEC_ADDRESS) || (v > KERNELCPU_LAST_ADDRESS)) {
         log("Received invalid pointer from kernel CPU: 0x%08x", v);
         return 0;
     }

soc/runtime/kloader.h

@@ -2,18 +2,17 @@
 #define __KLOADER_H
 
 #define KERNELCPU_EXEC_ADDRESS    0x40400000
-#define KERNELCPU_PAYLOAD_ADDRESS 0x40408000
+#define KERNELCPU_PAYLOAD_ADDRESS 0x40420000
+#define KERNELCPU_LAST_ADDRESS    (0x4fffffff - 1024*1024)
+#define KSUPPORT_HEADER_SIZE      0x80
 
 extern long long int now;
 
-typedef void (*kernel_function)(void);
+int kloader_load_library(void *code);
-
-int kloader_load(void *buffer, int length);
-kernel_function kloader_find(const char *name);
 
 void kloader_start_bridge(void);
-void kloader_start_idle_kernel(void);
+int kloader_start_idle_kernel(void);
-void kloader_start_user_kernel(kernel_function k);
+int kloader_start_kernel(const char *name);
 void kloader_stop(void);
 
 int kloader_validate_kpointer(void *p);

soc/runtime/ksupport.c

@@ -1,67 +1,254 @@
 #include <stdarg.h>
+#include <string.h>
+#include <stdio.h>
 
-#include "exceptions.h"
+#include <link.h>
-#include "bridge.h"
+#include <dlfcn.h>
+#include <dyld.h>
+#include <unwind.h>
+
+#include "ksupport.h"
+#include "kloader.h"
 #include "mailbox.h"
 #include "messages.h"
-#include "rtio.h"
+#include "bridge.h"
+#include "artiq_personality.h"
+#include "ttl.h"
 #include "dds.h"
+#include "rtio.h"
 
-/* for the prototypes for watchdog_set() and watchdog_clear() */
+/* compiler-rt symbols */
-#include "clock.h"
+extern void __divsi3, __modsi3, __ledf2, __gedf2, __unorddf2, __eqdf2, __ltdf2,
-/* for the prototype for rpc() */
+    __nedf2, __gtdf2, __negsf2, __negdf2, __addsf3, __subsf3, __mulsf3,
-#include "session.h"
+    __divsf3, __lshrdi3, __muldi3, __divdi3, __ashldi3, __ashrdi3,
-/* for the prototype for log() */
+    __udivmoddi4, __floatsisf, __floatunsisf, __fixsfsi, __fixunssfsi,
-#include "log.h"
+    __adddf3, __subdf3, __muldf3, __divdf3, __floatsidf, __floatunsidf,
+    __floatdidf, __fixdfsi, __fixdfdi, __fixunsdfsi, __clzsi2, __ctzsi2,
+    __udivdi3, __umoddi3, __moddi3;
 
-void exception_handler(unsigned long vect, unsigned long *sp);
+/* artiq_personality symbols */
-void exception_handler(unsigned long vect, unsigned long *sp)
+extern void __artiq_personality;
+
+struct symbol {
+    const char *name;
+    void *addr;
+};
+
+static const struct symbol runtime_exports[] = {
+    /* compiler-rt */
+    {"divsi3", &__divsi3},
+    {"modsi3", &__modsi3},
+    {"ledf2", &__ledf2},
+    {"gedf2", &__gedf2},
+    {"unorddf2", &__unorddf2},
+    {"eqdf2", &__eqdf2},
+    {"ltdf2", &__ltdf2},
+    {"nedf2", &__nedf2},
+    {"gtdf2", &__gtdf2},
+    {"negsf2", &__negsf2},
+    {"negdf2", &__negdf2},
+    {"addsf3", &__addsf3},
+    {"subsf3", &__subsf3},
+    {"mulsf3", &__mulsf3},
+    {"divsf3", &__divsf3},
+    {"lshrdi3", &__lshrdi3},
+    {"muldi3", &__muldi3},
+    {"divdi3", &__divdi3},
+    {"ashldi3", &__ashldi3},
+    {"ashrdi3", &__ashrdi3},
+    {"udivmoddi4", &__udivmoddi4},
+    {"floatsisf", &__floatsisf},
+    {"floatunsisf", &__floatunsisf},
+    {"fixsfsi", &__fixsfsi},
+    {"fixunssfsi", &__fixunssfsi},
+    {"adddf3", &__adddf3},
+    {"subdf3", &__subdf3},
+    {"muldf3", &__muldf3},
+    {"divdf3", &__divdf3},
+    {"floatsidf", &__floatsidf},
+    {"floatunsidf", &__floatunsidf},
+    {"floatdidf", &__floatdidf},
+    {"fixdfsi", &__fixdfsi},
+    {"fixdfdi", &__fixdfdi},
+    {"fixunsdfsi", &__fixunsdfsi},
+    {"clzsi2", &__clzsi2},
+    {"ctzsi2", &__ctzsi2},
+    {"udivdi3", &__udivdi3},
+    {"umoddi3", &__umoddi3},
+    {"moddi3", &__moddi3},
+
+    /* exceptions */
+    {"_Unwind_Resume", &_Unwind_Resume},
+    {"__artiq_personality", &__artiq_personality},
+    {"__artiq_raise", &__artiq_raise},
+    {"__artiq_reraise", &__artiq_reraise},
+
+    /* proxified syscalls */
+    {"now_init", &now_init},
+    {"now_save", &now_save},
+
+    {"watchdog_set", &watchdog_set},
+    {"watchdog_clear", &watchdog_clear},
+
+    {"log", &log},
+    {"lognonl", &lognonl},
+    {"rpc", &rpc},
+
+    /* direct syscalls */
+    {"rtio_get_counter", &rtio_get_counter},
+
+    {"ttl_set_o", &ttl_set_o},
+    {"ttl_set_oe", &ttl_set_oe},
+    {"ttl_set_sensitivity", &ttl_set_sensitivity},
+    {"ttl_get", &ttl_get},
+    {"ttl_clock_set", &ttl_clock_set},
+
+    {"dds_init", &dds_init},
+    {"dds_batch_enter", &dds_batch_enter},
+    {"dds_batch_exit", &dds_batch_exit},
+    {"dds_set", &dds_set},
+
+    /* end */
+    {NULL, NULL}
+};
+
+/* called by libunwind */
+int fprintf(FILE *stream, const char *fmt, ...)
 {
-    struct msg_exception msg;
+    struct msg_log request;
 
-    msg.type = MESSAGE_TYPE_EXCEPTION;
+    request.type = MESSAGE_TYPE_LOG;
-    msg.eid = EID_INTERNAL_ERROR;
+    request.fmt = fmt;
-    msg.eparams[0] = 256;
+    request.no_newline = 1;
-    msg.eparams[1] = 256;
+    va_start(request.args, fmt);
-    msg.eparams[2] = 256;
+    mailbox_send_and_wait(&request);
-    mailbox_send_and_wait(&msg);
+    va_end(request.args);
-    while(1);
+
+    return 0;
 }
 
-typedef void (*kernel_function)(void);
+/* called by libunwind */
+int dladdr (const void *address, Dl_info *info) {
+    /* we don't try to resolve names */
+    return 0;
+}
+
+/* called by libunwind */
+int dl_iterate_phdr (int (*callback) (struct dl_phdr_info *, size_t, void *), void *data) {
+    Elf32_Ehdr *ehdr;
+    struct dl_phdr_info phdr_info;
+    int retval;
+
+    ehdr = (Elf32_Ehdr *)(KERNELCPU_EXEC_ADDRESS - KSUPPORT_HEADER_SIZE);
+    phdr_info = (struct dl_phdr_info){
+        .dlpi_addr  = 0, /* absolutely linked */
+        .dlpi_name  = "<ksupport>",
+        .dlpi_phdr  = (Elf32_Phdr*) ((intptr_t)ehdr + ehdr->e_phoff),
+        .dlpi_phnum = ehdr->e_phnum,
+    };
+    retval = callback(&phdr_info, sizeof(phdr_info), data);
+    if(retval)
+        return retval;
+
+    ehdr = (Elf32_Ehdr *)KERNELCPU_PAYLOAD_ADDRESS;
+    phdr_info = (struct dl_phdr_info){
+        .dlpi_addr  = KERNELCPU_PAYLOAD_ADDRESS,
+        .dlpi_name  = "<kernel>",
+        .dlpi_phdr  = (Elf32_Phdr*) ((intptr_t)ehdr + ehdr->e_phoff),
+        .dlpi_phnum = ehdr->e_phnum,
+    };
+    retval = callback(&phdr_info, sizeof(phdr_info), data);
+    return retval;
+}
+
+static Elf32_Addr resolve_runtime_export(const char *name) {
+    const struct symbol *sym = runtime_exports;
+    while(sym->name) {
+        if(!strcmp(sym->name, name))
+            return (Elf32_Addr)sym->addr;
+        ++sym;
+    }
+    return 0;
+}
+
+void exception_handler(unsigned long vect, unsigned long *regs,
+                       unsigned long pc, unsigned long ea);
+void exception_handler(unsigned long vect, unsigned long *regs,
+                       unsigned long pc, unsigned long ea)
+{
+    artiq_raise_from_c("InternalError",
+        "Hardware exception {0} at PC {1}, EA {2}",
+        vect, pc, ea);
+}
 
 int main(void);
 int main(void)
 {
-    kernel_function k;
+    struct msg_load_request *msg = mailbox_receive();
-    void *jb;
 
-    k = mailbox_receive();
+    if(msg == NULL) {
-
-    if(k == NULL)
         bridge_main();
-    else {
+        while(1);
-        jb = exception_push();
+    }
-        if(exception_setjmp(jb)) {
+
-            struct msg_exception msg;
+    if(msg->library != NULL) {
+        const char *error;
+        if(!dyld_load(msg->library, KERNELCPU_PAYLOAD_ADDRESS,
+                      resolve_runtime_export, msg->library_info, &error)) {
+            struct msg_load_reply msg = {
+                .type = MESSAGE_TYPE_LOAD_REPLY,
+                .error = error
+            };
+            mailbox_send(&msg);
+            while(1);
+        }
+    }
+
+    void (*kernel)(void) = NULL;
+    if(msg->kernel != NULL) {
+        kernel = dyld_lookup(msg->kernel, msg->library_info);
+        if(kernel == NULL) {
+            char error[256];
+            snprintf(error, sizeof(error),
+                     "kernel '%s' not found in library", msg->kernel);
+            struct msg_load_reply msg = {
+                .type = MESSAGE_TYPE_LOAD_REPLY,
+                .error = error
+            };
+            mailbox_send(&msg);
+            while(1);
+        }
+    }
+
+    mailbox_acknowledge();
+
+    if(kernel) {
+        void (*run_closure)(void *) = msg->library_info->init;
+        run_closure(kernel);
 
-            msg.type = MESSAGE_TYPE_EXCEPTION;
-            msg.eid = exception_getid(msg.eparams);
-            mailbox_send_and_wait(&msg);
-        } else {
         struct msg_base msg;
-
-            k();
-            exception_pop(1);
-
         msg.type = MESSAGE_TYPE_FINISHED;
         mailbox_send_and_wait(&msg);
     }
-    }
+
+    while(1);
+}
+
+/* called from __artiq_personality */
+void __artiq_terminate(struct artiq_exception *artiq_exn,
+                       struct artiq_backtrace_item *backtrace,
+                       size_t backtrace_size) {
+    struct msg_exception msg;
+
+    msg.type = MESSAGE_TYPE_EXCEPTION;
+    msg.exception = artiq_exn;
+    msg.backtrace = backtrace;
+    msg.backtrace_size = backtrace_size;
+    mailbox_send(&msg);
+
     while(1);
 }
 
-long long int now_init(void);
 long long int now_init(void)
 {
     struct msg_base request;
@@ -72,8 +259,10 @@ long long int now_init(void)
     mailbox_send_and_wait(&request);
 
     reply = mailbox_wait_and_receive();
-    if(reply->type != MESSAGE_TYPE_NOW_INIT_REPLY)
+    if(reply->type != MESSAGE_TYPE_NOW_INIT_REPLY) {
-        exception_raise_params(EID_INTERNAL_ERROR, 1, 0, 0);
+        log("Malformed MESSAGE_TYPE_NOW_INIT_REQUEST reply type");
+        while(1);
+    }
     now = reply->now;
     mailbox_acknowledge();
 
@@ -85,7 +274,6 @@ long long int now_init(void)
     return now;
 }
 
-void now_save(long long int now);
 void now_save(long long int now)
 {
     struct msg_now_save request;
@@ -106,8 +294,10 @@ int watchdog_set(int ms)
     mailbox_send_and_wait(&request);
 
     reply = mailbox_wait_and_receive();
-    if(reply->type != MESSAGE_TYPE_WATCHDOG_SET_REPLY)
+    if(reply->type != MESSAGE_TYPE_WATCHDOG_SET_REPLY) {
-        exception_raise_params(EID_INTERNAL_ERROR, 2, 0, 0);
+        log("Malformed MESSAGE_TYPE_WATCHDOG_SET_REQUEST reply type");
+        while(1);
+    }
     id = reply->id;
     mailbox_acknowledge();
 
@@ -127,7 +317,6 @@ int rpc(int rpc_num, ...)
 {
     struct msg_rpc_request request;
     struct msg_rpc_reply *reply;
-    int eid, retval;
 
     request.type = MESSAGE_TYPE_RPC_REQUEST;
     request.rpc_num = rpc_num;
@@ -136,15 +325,21 @@ int rpc(int rpc_num, ...)
     va_end(request.args);
 
     reply = mailbox_wait_and_receive();
-    if(reply->type != MESSAGE_TYPE_RPC_REPLY)
+    if(reply->type != MESSAGE_TYPE_RPC_REPLY) {
-        exception_raise_params(EID_INTERNAL_ERROR, 3, 0, 0);
+        log("Malformed MESSAGE_TYPE_RPC_REPLY reply type");
-    eid = reply->eid;
+        while(1);
-    retval = reply->retval;
+    }
-    mailbox_acknowledge();
 
-    if(eid != EID_NONE)
+    if(reply->exception != NULL) {
-        exception_raise(eid);
+        struct artiq_exception exception;
+        memcpy(&exception, reply->exception, sizeof(exception));
+        mailbox_acknowledge();
+        __artiq_raise(&exception);
+    } else {
+        int retval = reply->retval;
+        mailbox_acknowledge();
         return retval;
+    }
 }
 
 void lognonl(const char *fmt, ...)

soc/runtime/ksupport.h

@@ -0,0 +1,12 @@
+#ifndef __KSTARTUP_H
+#define __KSTARTUP_H
+
+long long int now_init(void);
+void now_save(long long int now);
+int watchdog_set(int ms);
+void watchdog_clear(int id);
+int rpc(int rpc_num, ...);
+void lognonl(const char *fmt, ...);
+void log(const char *fmt, ...);
+
+#endif /* __KSTARTUP_H */

soc/runtime/ksupport.ld

@@ -4,10 +4,10 @@ ENTRY(_start)
 INCLUDE generated/regions.ld
 
 /* First 4M of main memory are reserved for runtime code/data
- * then comes kernel memory. First 32K of kernel memory are for support code.
+ * then comes kernel memory. First 128K of kernel memory are for support code.
  */
 MEMORY {
-    ksupport : ORIGIN = 0x40400000, LENGTH = 0x8000
+    ksupport (RWX) : ORIGIN = 0x40400000, LENGTH = 0x20000
 }
 
 /* On AMP systems, kernel stack is at the end of main RAM,
@@ -15,6 +15,13 @@ MEMORY {
  */
 PROVIDE(_fstack = 0x40000000 + LENGTH(main_ram) - 1024*1024 - 4);
 
+/* Force ld to make the ELF header as loadable. */
+PHDRS
+{
+    text     PT_LOAD FILEHDR PHDRS;
+    eh_frame PT_GNU_EH_FRAME;
+}
+
 SECTIONS
 {
     .text :
@@ -22,7 +29,7 @@ SECTIONS
         _ftext = .;
         *(.text .stub .text.* .gnu.linkonce.t.*)
         _etext = .;
-    } > ksupport
+    } :text
 
     .rodata :
     {
@@ -33,6 +40,16 @@ SECTIONS
         _erodata = .;
     } > ksupport
 
+    .eh_frame :
+    {
+        *(.eh_frame)
+    } :text
+
+    .eh_frame_hdr :
+    {
+        *(.eh_frame_hdr)
+    } :text :eh_frame
+
     .data :
     {
         . = ALIGN(4);
@@ -41,7 +58,7 @@ SECTIONS
         *(.data1)
         *(.sdata .sdata.* .gnu.linkonce.s.*)
         _edata = .;
-    } > ksupport
+    }
 
     .bss :
     {
@@ -57,5 +74,5 @@ SECTIONS
         _ebss = .;
         . = ALIGN(8);
         _heapstart = .;
-    } > ksupport
+    }
 }

soc/runtime/messages.h

@@ -2,8 +2,10 @@
 #define __MESSAGES_H
 
 #include <stdarg.h>
+#include <stddef.h>
 
 enum {
+    MESSAGE_TYPE_LOAD_REPLY,
     MESSAGE_TYPE_NOW_INIT_REQUEST,
     MESSAGE_TYPE_NOW_INIT_REPLY,
     MESSAGE_TYPE_NOW_SAVE,
@@ -34,6 +36,17 @@ struct msg_base {
 
 /* kernel messages */
 
+struct msg_load_request {
+    void *library;
+    struct dyld_info *library_info;
+    const char *kernel;
+};
+
+struct msg_load_reply {
+    int type;
+    const char *error;
+};
+
 struct msg_now_init_reply {
     int type;
     long long int now;
@@ -46,8 +59,9 @@ struct msg_now_save {
 
 struct msg_exception {
     int type;
-    int eid;
+    struct artiq_exception *exception;
-    long long int eparams[3];
+    struct artiq_backtrace_item *backtrace;
+    size_t backtrace_size;
 };
 
 struct msg_watchdog_set_request {
@@ -73,7 +87,7 @@ struct msg_rpc_request {
 
 struct msg_rpc_reply {
     int type;
-    int eid;
+    struct artiq_exception *exception;
     int retval;
 };
 

soc/runtime/rtio.h

@@ -2,7 +2,7 @@
 #define __RTIO_H
 
 #include <generated/csr.h>
-#include "exceptions.h"
+#include "artiq_personality.h"
 
 #define RTIO_O_STATUS_FULL 1
 #define RTIO_O_STATUS_UNDERFLOW 2
@@ -24,12 +24,14 @@ static inline void rtio_write_and_process_status(long long int timestamp, int ch
             while(rtio_o_status_read() & RTIO_O_STATUS_FULL);
         if(status & RTIO_O_STATUS_UNDERFLOW) {
             rtio_o_underflow_reset_write(1);
-            exception_raise_params(EID_RTIO_UNDERFLOW,
+            artiq_raise_from_c("RTIOUnderflow",
+                "RTIO underflow at {0}mu, channel {1}, counter {2}",
                 timestamp, channel, rtio_get_counter());
         }
         if(status & RTIO_O_STATUS_SEQUENCE_ERROR) {
             rtio_o_sequence_error_reset_write(1);
-            exception_raise_params(EID_RTIO_SEQUENCE_ERROR,
+            artiq_raise_from_c("RTIOSequenceError",
+                "RTIO sequence error at {0}mu, channel {1}",
                 timestamp, channel, 0);
         }
     }

soc/runtime/runtime.ld

@@ -10,6 +10,13 @@ MEMORY {
 	runtime : ORIGIN = 0x40000000, LENGTH = 0x400000 /* 4M */
 }
 
+/* First 4M of main memory are reserved for runtime code/data
+ * then comes kernel memory. First 32K of kernel memory are for support code.
+ */
+MEMORY {
+  kernel : ORIGIN = 0x40400000, LENGTH = 0x8000
+}
+
 /* Kernel memory space start right after the runtime,
  * and ends before the runtime stack.
  * Runtime stack is always at the end of main_ram.
@@ -17,6 +24,11 @@ MEMORY {
  */
 PROVIDE(_fstack = 0x40000000 + LENGTH(main_ram) - 4);
 
+/* On AMP systems, kernel stack is at the end of main RAM,
+ * before the runtime stack. Leave 1M for runtime stack.
+ */
+PROVIDE(_kernel_fstack = 0x40000000 + LENGTH(main_ram) - 1024*1024 - 4);
+
 SECTIONS
 {
 	.text :
@@ -58,6 +70,12 @@ SECTIONS
 		. = ALIGN(4);
 		_ebss = .;
 		. = ALIGN(8);
-		_heapstart = .;
 	} > runtime
+
+	/DISCARD/ :
+	{
+		*(.eh_frame)
+	}
+
+	_heapstart = .;
 }

soc/runtime/services.c

@@ -1,78 +0,0 @@
-#include <string.h>
-
-#include "elf_loader.h"
-#include "session.h"
-#include "clock.h"
-#include "ttl.h"
-#include "dds.h"
-#include "exceptions.h"
-#include "services.h"
-
-#include "service_table.h"
-
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wimplicit-int"
-extern __divsi3, __modsi3, __ledf2, __gedf2, __unorddf2, __eqdf2, __ltdf2,
-    __nedf2, __gtdf2, __negsf2, __negdf2, __addsf3, __subsf3, __mulsf3,
-    __divsf3, __lshrdi3, __muldi3, __divdi3, __ashldi3, __ashrdi3,
-    __udivmoddi4, __floatsisf, __floatunsisf, __fixsfsi, __fixunssfsi,
-    __adddf3, __subdf3, __muldf3, __divdf3, __floatsidf, __floatunsidf,
-    __floatdidf, __fixdfsi, __fixdfdi, __fixunsdfsi, __clzsi2, __ctzsi2,
-    __udivdi3, __umoddi3, __moddi3;
-#pragma GCC diagnostic pop
-
-static const struct symbol compiler_rt[] = {
-    {"divsi3", &__divsi3},
-    {"modsi3", &__modsi3},
-    {"ledf2", &__ledf2},
-    {"gedf2", &__gedf2},
-    {"unorddf2", &__unorddf2},
-    {"eqdf2", &__eqdf2},
-    {"ltdf2", &__ltdf2},
-    {"nedf2", &__nedf2},
-    {"gtdf2", &__gtdf2},
-    {"negsf2", &__negsf2},
-    {"negdf2", &__negdf2},
-    {"addsf3", &__addsf3},
-    {"subsf3", &__subsf3},
-    {"mulsf3", &__mulsf3},
-    {"divsf3", &__divsf3},
-    {"lshrdi3", &__lshrdi3},
-    {"muldi3", &__muldi3},
-    {"divdi3", &__divdi3},
-    {"ashldi3", &__ashldi3},
-    {"ashrdi3", &__ashrdi3},
-    {"udivmoddi4", &__udivmoddi4},
-    {"floatsisf", &__floatsisf},
-    {"floatunsisf", &__floatunsisf},
-    {"fixsfsi", &__fixsfsi},
-    {"fixunssfsi", &__fixunssfsi},
-    {"adddf3", &__adddf3},
-    {"subdf3", &__subdf3},
-    {"muldf3", &__muldf3},
-    {"divdf3", &__divdf3},
-    {"floatsidf", &__floatsidf},
-    {"floatunsidf", &__floatunsidf},
-    {"floatdidf", &__floatdidf},
-    {"fixdfsi", &__fixdfsi},
-    {"fixdfdi", &__fixdfdi},
-    {"fixunsdfsi", &__fixunsdfsi},
-    {"clzsi2", &__clzsi2},
-    {"ctzsi2", &__ctzsi2},
-    {"udivdi3", &__udivdi3},
-    {"umoddi3", &__umoddi3},
-    {"moddi3", &__moddi3},
-    {NULL, NULL}
-};
-
-void *resolve_service_symbol(const char *name)
-{
-    if(strncmp(name, "__", 2) != 0)
-        return NULL;
-    name += 2;
-    if(strncmp(name, "syscall_", 8) == 0)
-        return find_symbol(syscalls, name + 8);
-    if(strncmp(name, "eh_", 3) == 0)
-        return find_symbol(eh, name + 3);
-    return find_symbol(compiler_rt, name);
-}

soc/runtime/services.h

@@ -1,6 +0,0 @@
-#ifndef __SERVICES_H
-#define __SERVICES_H
-
-void *resolve_service_symbol(const char *name);
-
-#endif /* __SERVICES_H */

soc/runtime/session.c

@@ -10,7 +10,7 @@
 #include "clock.h"
 #include "log.h"
 #include "kloader.h"
-#include "exceptions.h"
+#include "artiq_personality.h"
 #include "flash_storage.h"
 #include "rtiocrg.h"
 #include "session.h"
@@ -86,7 +86,7 @@ enum {
     REMOTEMSG_TYPE_IDENT_REQUEST,
     REMOTEMSG_TYPE_SWITCH_CLOCK,
 
-    REMOTEMSG_TYPE_LOAD_OBJECT,
+    REMOTEMSG_TYPE_LOAD_LIBRARY,
     REMOTEMSG_TYPE_RUN_KERNEL,
 
     REMOTEMSG_TYPE_RPC_REPLY,
@@ -161,23 +161,22 @@ static int process_input(void)
                 buffer_out[8] = REMOTEMSG_TYPE_CLOCK_SWITCH_FAILED;
             submit_output(9);
             break;
-        case REMOTEMSG_TYPE_LOAD_OBJECT:
+        case REMOTEMSG_TYPE_LOAD_LIBRARY:
             if(user_kernel_state >= USER_KERNEL_RUNNING) {
-                log("Attempted to load new kernel while already running");
+                log("Attempted to load new kernel library while already running");
                 buffer_out[8] = REMOTEMSG_TYPE_LOAD_FAILED;
                 submit_output(9);
                 break;
             }
-            if(kloader_load(&buffer_in[9], get_in_packet_len() - 8)) {
+            if(kloader_load_library(&buffer_in[9])) {
                 buffer_out[8] = REMOTEMSG_TYPE_LOAD_COMPLETED;
                 user_kernel_state = USER_KERNEL_LOADED;
-            } else
+            } else {
                 buffer_out[8] = REMOTEMSG_TYPE_LOAD_FAILED;
+            }
             submit_output(9);
             break;
         case REMOTEMSG_TYPE_RUN_KERNEL: {
-            kernel_function k;
-
             if(user_kernel_state != USER_KERNEL_LOADED) {
                 log("Attempted to run kernel while not in the LOADED state");
                 buffer_out[8] = REMOTEMSG_TYPE_KERNEL_STARTUP_FAILED;
@@ -193,16 +192,14 @@ static int process_input(void)
             }
             buffer_in[buffer_in_index] = 0;
 
-            k = kloader_find((char *)&buffer_in[9]);
+            watchdog_init();
-            if(k == NULL) {
+            if(!kloader_start_kernel((char *)&buffer_in[9])) {
                 log("Failed to find kernel entry point '%s' in object", &buffer_in[9]);
                 buffer_out[8] = REMOTEMSG_TYPE_KERNEL_STARTUP_FAILED;
                 submit_output(9);
                 break;
             }
 
-            watchdog_init();
-            kloader_start_user_kernel(k);
             user_kernel_state = USER_KERNEL_RUNNING;
             break;
         }
@@ -215,7 +212,7 @@ static int process_input(void)
             }
 
             reply.type = MESSAGE_TYPE_RPC_REPLY;
-            memcpy(&reply.eid, &buffer_in[9], 4);
+            // FIXME memcpy(&reply.eid, &buffer_in[9], 4);
             memcpy(&reply.retval, &buffer_in[13], 4);
             mailbox_send_and_wait(&reply);
             user_kernel_state = USER_KERNEL_RUNNING;
@@ -481,8 +478,8 @@ static int process_kmsg(struct msg_base *umsg)
             struct msg_exception *msg = (struct msg_exception *)umsg;
 
             buffer_out[8] = REMOTEMSG_TYPE_KERNEL_EXCEPTION;
-            memcpy(&buffer_out[9], &msg->eid, 4);
+            // memcpy(&buffer_out[9], &msg->eid, 4);
-            memcpy(&buffer_out[13], msg->eparams, 3*8);
+            // memcpy(&buffer_out[13], msg->eparams, 3*8);
             submit_output(9+4+3*8);
 
             kloader_stop();

soc/runtime/ttl.c

@@ -1,6 +1,6 @@
 #include <generated/csr.h>
 
-#include "exceptions.h"
+#include "artiq_personality.h"
 #include "rtio.h"
 #include "ttl.h"
 
@@ -40,7 +40,8 @@ long long int ttl_get(int channel, long long int time_limit)
     while((status = rtio_i_status_read())) {
         if(rtio_i_status_read() & RTIO_I_STATUS_OVERFLOW) {
             rtio_i_overflow_reset_write(1);
-            exception_raise_params(EID_RTIO_OVERFLOW,
+            artiq_raise_from_c("RTIOOverflow",
+                "RTIO overflow at channel {0}",
                 channel, 0, 0);
         }
         if(rtio_get_counter() >= time_limit) {